All issues
Volume 41 (1976)
- Issue 6 Pages 1821-
- Issue 5 Pages 1445-
- Issue 4 Pages 1093-
- Issue 3 Pages 729-
- Issue 2 Pages 361-
- Issue 1 Pages 1-
Predecessor
- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
- Proceedings of the Tokyo Mathematico-Physical Society. 2nd Series
- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
- Tokyo Sugaku-Butsurigakkwai Hokoku
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku Kaisya Zasshi
Volume 41, Issue 5
Displaying 1-50 of 62 articles from this issue
-
Katsuji Koyama1976 Volume 41 Issue 5 Pages 1445-1452
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 12C(τ, d)13N reaction was investigated at an incident energy of 81.4 MeV. Angular distributions of the reaction were analyzed by zero-range and finite-range DWBA. It is found that finite-range effects are important in this reaction. Particle unbound states are analyzed by using resonance form factors, and the results are discussed in comparison with those of proton resonance scattering.View full abstractDownload PDF (964K) -
Kozo Hoshino1976 Volume 41 Issue 5 Pages 1453-1458
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe optical conductivity of a two-dimensional disordered system is calculated using a simple model, in which the existence of the so-called mobility edge is assumed and the energy dependence of the localized state wavefunction is taken into account. The frequency dependence of the calculated optical conductivity agrees qualitatively with the experimental result for the silicon inversion layer obtained recently by Allen, Tsui and DeRosa. It is shown that the energy dependence of the localized state wave function is very important to determine the behaviour of the optical conductivity.View full abstractDownload PDF (652K) -
Minoru Kikuchi1976 Volume 41 Issue 5 Pages 1459-1465
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNumerical studies are made on the localization of p-electrons in disordered two dimensional lattices with fluctuations in the interatomic distance not larger than those found in a liquid. Results based on simple models for the interaction between atomic p-states indicate that the localizability of p-electrons is not so enhanced as compared to that of s-electrons.
Further, a system is considered in which an atom has both s- and p-states. It is demonstrated that the sp-hybridization considerably enhances the localizability at the extremities of a band.View full abstractDownload PDF (848K) -
Masaru Tsukada1976 Volume 41 Issue 5 Pages 1466-1472
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn effective Hamiltonian to describe the dynamics of the center coordinates of the cyclotron motion is presented. The tail states of the Landau subbands are investigated by means of the effective Hamiltonian for the case of long-range random potentials. Especially the state density in the tail is obtained by the WKB approximation. The mobility edge is roughly estimated by the classical percolation theory and compared with experimental results.View full abstractDownload PDF (764K) -
Akio Kotani1976 Volume 41 Issue 5 Pages 1473-1479
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSelf-consistent calculations of amplitudes of primary spin-density-wave A1, second harmonic charge-density-wave A2 and third harmonic spin-density-wave A3 in chromium are made with a simple two-band model both by a perturbation method and an exact numerical method. It is shown that A2 is almost always proportional to (A1)2 irrespective of the sign of a coupling constant v relevant to charge density interaction, but that the behavior of A3 depends on the sign of v. When v is positive (i.e. repulsive interaction), A3 is proportional to (A1)3 at temperatures close to the Néel point, but shows a tendency of saturation at low temperatures, in agreement with recent experimental observations by Pynn et al. When v is negative, the saturation of A3 is absent.View full abstractDownload PDF (700K) -
Hideo Nagayoshi, Kenji Nakao, Yasutada Uemura1976 Volume 41 Issue 5 Pages 1480-1487
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe complicated Fermi surface of graphite has been constructed successfully by using a new method of ab initio energy band calculation. The new method has been developed for he purpose of obtaining detailed band structures of layer-type crystals, in which the total wavefunction is constructed by two-dimensional OPW’s in a layer plane and by one-dimensional Bloch functions for a virtual crystal in the direction perpendicular to the layer.
The Slonczewski-Weiss band model has been found to be fully adequate for the description of the Fermi surface of graphite. Theoretical values of the parameters γ0∼γ5 and Δ in this band model have been obtained, being in good agreement with experimental ones.View full abstractDownload PDF (1016K) -
Susumu Kurihara1976 Volume 41 Issue 5 Pages 1488-1498
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffect of dilute impurities on Fröhlich’s collective mode is investigated by solving the Dyson equation for the collective mode Green’s function which includes self-consistently an infinite series of impurity scattering processes occuring through electronic bubbles. The Dyson equation is shown to reduce to a simple algebraic equation in the low frequency region of interest. The electrical conductivity σ(ω) is examined and related to the collective mode Green’s function.
An analytic solution to the reduced Dyson equation is obtained. The resulting expression for conductivity is very simple: σ(ω)∝ω−3\sqrtω2−(1⁄2)ωT2 where ωT is a constant. the analytic expression for σ(ω) describes the pinning effect fairly well: it gives a sharp asymmetric peak at (\sqrt3⁄2)ωT with width ∼ωT, and it satisfies exactly the conductivity sum rule for the collective mode.View full abstractDownload PDF (1092K) -
Yuji Kodama, Miki Wadati1976 Volume 41 Issue 5 Pages 1499-1504
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that a nonlinear partial differential equation ut+6αuux+6βu2ux+uxxx=0 is a completely integrable Hamiltonian system.View full abstractDownload PDF (556K) -
Masakazu Ito1976 Volume 41 Issue 5 Pages 1505-1512
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDensity correlation function ⟨ρ·ρ⟩kω is calculated on the basis of phenomenological equations of macroscopic variables ρ, s, j, Ψ, Ψ*, near Tλ. In particular the “central peak” due to fluctuations in the amplitude of the condensate field Ψ is carefully investigated. It is concluded, however, that the “central peak” is far less important than the contributions from second sound in the regime kξ<1. The final expression obtained for ⟨ρ·ρ⟩kω is compared with that of Kretzen and Mikeska and that of Hohenberg.View full abstractDownload PDF (860K) -
Yoichi Kuramitsu1976 Volume 41 Issue 5 Pages 1513-1521
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe microscopic dynamics of the metamagnetic transition of CoCl2·2H2O was investigated by the measurements of the magnetization process at a constant temperature as a function of time, and the field points of temperature spikes (ΔT) in the course of adiabatic magnetization. The time required for the AF–FI transition, τAF–FI, was measured by the field-step method. τAF–FI (T, H)=4.0×10−8·exp(9.0×10−3|H−H*|⁄T) sec, where H* was 39 kOe in Hinc and 24 kOe in Hdec. The series of delayed AF–FI transition points predicted by Tinkham were detected by measuring the ΔT spikes and magnetization steps at 1.4≤T≤4.2 K. ΔT spikes were found at some other points (<HC2) which corresponded to the rearrangement of the mis-fitting spin-sites. From the various anomalies of hysteresis phenomena, which were newly found comparing the results in the field returned back before and after passing HC2, the mechanism of the rearrangement could be discussed.View full abstractDownload PDF (1076K) -
Yoshikazu Miyahara, Fuminori Sai1976 Volume 41 Issue 5 Pages 1522-1529
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLarge magnetic moments were observed in the cubic spinel oxides GexZn1−xFe2O4 (0<x<1). Lattice constant of this system deviates from the Vegard’s law. Intensity analysis of X-ray powder diffraction indicates that approximately 30% of A site are occupied by magnetic ions in the case x=0.5. Ion distribution of the whole system is proposed which can explain the x dependence of the magnetic moment and the lattice constant. The distribution is shown to be reasonable from a view point of electric charge neutrality in a cluster of several cations and anions.View full abstractDownload PDF (952K) -
S. Radhakrishna, B. V. R. Chowdari, A. Kasi Viswanath1976 Volume 41 Issue 5 Pages 1530-1533
Published: November 15, 1976
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe EPR on single crystals of BaCl2·2H2O and BaBr2·2H2O doped with vanadyl ions are studied in the temperature range 30°C to −196°C. At room temperature the hyperfine structure of vanadium is observed. The spectrum at room temperature is isotropic and shows that vanadyl is tumbling in the lattice. The spectrum at low temperatures is also angular independent and the characteristics show that the motions of vanadyl are hindered. The spectra are analysed using a spin-Hamiltonian corresponding to tetragonal symmetry. The dependence of the linewidth on the nuclear-spin quantum number is studied and the linewidths at room temperature are found to obey the relation 1⁄T2=π\sqrt3(a1+a2mI+a3mI2). The linewidth is found to increase at low temperature which is due to the increase in the correlation time.View full abstractDownload PDF (416K) -
Kazushi Sugawara, C. Y. Huang1976 Volume 41 Issue 5 Pages 1534-1539
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEPR of Gd3+ in the Van Vleck paramagnets, PrPb3 and TmCd have been investigated. The temperature-dependent linewidths have been found to be in agreement with the prediction of Moriya and Obata. In a complementary study, non-S-State Dy3+ in TmP, TmAs, PrP, PrAs, PrSb, PrBi and PrS, and Ce3+ in TmS, TmAs, PrS and PrP have been examined. For all these cases, (S-state as well as the non-S-state magnetic ions), the temperature variation of the g-shifts follows the susceptibilities of the hosts. The exchange coupling constants between the impurity ions and the host magnetic ions have been obtained.View full abstractDownload PDF (616K) -
Hitoshi Yamazaki, Motoyuki Tanaka1976 Volume 41 Issue 5 Pages 1540-1543
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSubthreshold steady-state absorption under parallel pumping in a quasi-two-dimensional ferromagnet K2CuF4 has been observed at a pumping frequency of 8.9 GHz in the temperature range from 1.4 to 4.2 K. The magnon density of states by which the magnitude of the absorption is mainly determined is experimentally revealed near the band edge including the singular point due to weak interlayer exchange interaction. A prospect for parallel pumping in a quasi-one-dimensional ferromagnet is given.View full abstractDownload PDF (404K) -
Tetsuo Soumura, Takao Maeda1976 Volume 41 Issue 5 Pages 1544-1549
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe absolute thermoelectric power S of polycrystalline gadolinium has been measured with and without a magnetic field over the temperature ranges from 77 K to 400 K. As an effect of the magnetic field on S, a peak is observed at 220∼230 K, of which the temperature corresponds to an occuring temperature of a spin rotation from the hexagonal c-axis to a cone structure about the c-axis. The temperature variations of S and the magnetic field effect in ferromagnetic regions are analyzed in terms of the Kasuya theory based on the free electron model. At paramagnetic states, on the other hand, S increases with increasing temperature. This temperature variation is calculated taking into account unusual conductive 5d–6s bands with a 3d electron-like high density of states pointed out by Keeton and Loucks.View full abstractDownload PDF (836K) -
Katsunori Iio, Kazukiyo Nagata1976 Volume 41 Issue 5 Pages 1550-1555
Published: November 15, 1976
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSOptical absorption studies of the quadratic-layer antiferromagnets K2NiF4, Rb2NiF4 and Ba2NiF6 in the regions of electronic transitions have been performed from the magnetic anisotropic point of view. A Ni2+ energy spectrum reflecting a tetragonal crystalline field was observed in Ba2NiF6, while cubic spectra were obtained in K2NiF4 and Rb2NiF4. From the observed tetragonal splitting energy of 3T2g(3F) band, the single ion anisotropy constant D of Ni2+ in Ba2NiF6 was determined as fairly large value of −15.4±1.8 cm−1 and −12.8±1.8 cm−1 at 300 K and 90 K, respectively.View full abstractDownload PDF (680K) -
Yasunori Kubo, Shinya Wakoh, Jiro Yamashita1976 Volume 41 Issue 5 Pages 1556-1561
Published: November 15, 1976
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe complex dielectric function ε(0, ω) of copper is calculated by a realistic band model up to hω=25 eV. the energy values ad the wave functions are calculated by APW method with the Chodorow potential. The eleven energy bands are used to obtain the matrix elements of the interband transitions. The energy loss spectrum at long wave limit is determined from the complex dielectric function. It has a broad peak whose center is situated near 20 eV. Since the plasmon energy of the electron gas of the same electron density as that of copper is about 10 eV, the observed energy loss spectrum is not free-electron like, but its character is ascribed to the interband transition from the 3d-bands to the empty bands. The observed energy loss spectrum by Takigawa et al. is in good agreement with the result of our calculation.View full abstractDownload PDF (636K) -
Masafumi Senoo, Hisao Mii, Ikuya Fujishiro1976 Volume 41 Issue 5 Pages 1562-1569
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new method for the determination of parameters in the pseudopotential of the Heine-Abarenkov model is proposed. In the present method the total energy can be expressed as a function of the atomic volume. The values of new parameters are determined from the experimental data of crystal properties at 0 K and 0 kbar. The pressure-volume relations for eight cubic metals Na, K, Rb, Cs, Ca, Al, Si and Ge are calculated up to very high pressure by means of this model potential and the second order perturbation theory. From these calculated results the pressure-volume relations at 293 K are estimated and compared with the experimental data obtained by various methods. The agreement for all metals except Ca is fairly good and some systematic error seems to be included in Bridgman’s data.View full abstractDownload PDF (1036K) -
Shoji Ishida, Junji Ishida, Setsuo Asano, Jiro Yamashita1976 Volume 41 Issue 5 Pages 1570-1574
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe energy bands of an ordered alloy Fe3Al both in paramagnetic and ferromagnetic state are calculated by the symmetrized augmented plane wave (SAPW) method. There are two types of iron atoms (Fe(I) and Fe(II)) in ferromagnetic state with a different value of the magnetic moment.
The density-of-states of Fe(I) which has eight iron atoms as its nearest neighbors is different from that of Fe(II) which is surrounded by four iron atoms and four aluminum atoms. The former density is quite similar to that of iron metal, but the latter is considerably different. The d-bands of majority spin electrons mostly lie below the Fermi level, whereas those of minority spin electrons are extended across the Fermi level.
The values of magnetic moments calculated for Fe(I) and Fe(II) are in good agreement with experimental values. The difference between magnetic moments on the atom Fe(II) and on Fe atom in iron metal seems to be attributed to the change of the density-of-states near the top of the d-bands. It is evident that the electronic structures of Fe(II) atoms have been considerably affected by the neighboring aluminum atoms.View full abstractDownload PDF (676K) -
Michio Kiritani, Yasuhiro Maehara, Hiroshi Takata1976 Volume 41 Issue 5 Pages 1575-1583
Published: November 15, 1976
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElectron radiation damage of molybdenum was performed in a high voltage electron microscope at temperatures up to 600°C. The defects formed by the clustering of point defects are dislocation loops of interstitial type on {111} planes with their Burgers vector perpendicular to the loop plane. The characteristic shape of the loops is induced by the directional flow of interstitial atoms along the gradient of the dilatational strain field of the dislocation loops. The nucleation of loops is found to be impurity sensitive. An analysis of the temperature dependence of the number of loop nuclei gives the activation energy for the release process of interstitial atoms from the impurity traps to be 0.19 eV. The nucleation period and growth nature of interstitial loops are classified with irradiation temperature, and they are well explained in terms of the vacancy mobility. It is confirmed that the lower the irradiation temperature is, the greater the amount of vacancies accumulated in a specimen.View full abstractDownload PDF (2444K) -
Kozo Furukawa, Jin-ichi Takamura, Nobuo Kuwana, Ryoichi Tahara, Mutsum ...1976 Volume 41 Issue 5 Pages 1584-1592
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWith particular attention to the thermal stain and the specimen thickness effect, the energy and the entropy for the formation of a vacancy in pure aluminium were carefully determined from the measurement of quenched-in resistivities. The energy and the entropy thus obtained are 0.702±0.003 eV and 1.69±0.06 k, respectively. Free energies for the migration and the binding of a divacancy at temperatures 85±5°C were also determined from the initial decay rate on isothermal annealing of quenched-in resistivities, which are 0.43±0.02 eV and 0.14±0.02 eV, respectively.View full abstractDownload PDF (1028K) -
Koushi Ando, Kikuo Yamabe, Shigehiro Hamada, Chihiro Hamaguchi1976 Volume 41 Issue 5 Pages 1593-1602
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSResonant Brillouin Scattering in semi-insulating ZnSe is investigated at room temperature by using two kinds of injected acoustic waves; fast transverse and slow transverse modes. The observed dispersions in scattering cross section show the resonant enhancement and cancellation near the fundamental absorption edge, which are explained by theoretical analyses based upon Loudon’s theory. Calculated dispersions taking account of exciton virtual states agree well with the experimental results. Resonant cancellation is explained in terms of the relevant photoelastic constants undergoing a sign reversal near the band edge, which was confirmed by the analyses of piezobirefringence theory.View full abstractDownload PDF (1284K) -
Tatau Nishinaga, Osamu Hori, Susumu Uchiyama1976 Volume 41 Issue 5 Pages 1603-1610
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDisorder scattering in semiconductor alloys is studied by employing Green’s function method. As a first approximation, Yonezawa’s self-consistent Green’s function is applied to the problem. The scattering potential of the alloying atoms is determined empirically by comparing experimental and theoretical band edge shifts. Calculation with In1−xGaxAs case demonstrates that the present calculation gives much lower mobility than Brooks’ in a good agreement with the experiments.View full abstractDownload PDF (952K) -
Ajay Gupta, K. Rama Reddy1976 Volume 41 Issue 5 Pages 1611-1616
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe observed anomalies in second order Doppler shift (SOD-shift) and recoilless fraction are explained on the basis of the thermal relaxation of a localized mode. A general expression which includes both the SOD-effect and the lattice mode relaxation is derived for the emission probability of Mössbauer radiation. The recoilless fraction is found to be independent of the mode relaxation. A particular class of simple experiments are suggested for the unambiguous evaluation of the thermal relaxation rate of the localized mode.View full abstractDownload PDF (672K) -
Kazuro Murayama, Kazuo Morigaki, Shiro Sakuragi, Hiroshi Kanzaki1976 Volume 41 Issue 5 Pages 1617-1624
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have observed ESR spectra of the excited states related to the prompt and delayed luminescences in silver halides. The localized state responsible for the prompt luminescence in AgCl is identified as the self-trapped exciton localized at a chloride ion. The self-trapped hole stage of Ag2+ is found to participate in the delayed luminescence in AgCl which is due to the recombination of the distant electron-hole pair. Some information is obtained on the trapped electrons in volved in the delayed luminescence.View full abstractDownload PDF (1032K) -
Yasushi Hoshino, Kazuyoshi Tateishi1976 Volume 41 Issue 5 Pages 1625-1629
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTransport of holes through beta-carotene glass was studied using a transient photoconductivity technique. The mobility is measured to be 1.5×10−3 cm2/V sec at 21°C and 104 V/cm. The motion of carriers can be represented by transit time Tr, which means the time necessary for a charge carrier to travel from the front electrode to the counter-electrode of the sample. The inverse transit time (Tr)−1 is found to vary with temperature T in the form of exp (−ε0⁄kT), with ε0=0.22 eV, and to vary with electric field E in the form of exp (αcE1⁄2) with αe=2×10−3 (m/V)1⁄2. Dielectric constant ε of beta-carotene glass was measured to be ε=1×10−10 F/m at 1 KHz. Using the Poole-Frenkel theory, the coefficient of E1⁄2 in exp (αtE1⁄2) is estimated to be αt=1×10−3 (m/V)1⁄2. The observed αe agrees approximately with the value of estimated αt. Therefore, it is concluded that the transport of charge carrier is mainly controlled by the Poole-Frenkel effect.View full abstractDownload PDF (660K) -
Katsuyuki Asaumi, Osamu Shimomura, Shigeru Minomura1976 Volume 41 Issue 5 Pages 1630-1635
Published: November 15, 1976
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPressure-induced structural transformations in amorphous InSb have been studied by X-ray diffraction at room temperature. Amorphous InSb slowly transforms to a crystalline modification with NaCl-type structure at pressures from 4 to 28 kbar, and to β-Sn-type structure or its modified tetragonal structure above 28 kbar. After releasing pressure the NaCl-type modification below 28 kbar is retained at atmospheric pressure and room temperature, whereas the high pressure modification formed above 28 kbar transforms to a crystalline mixture of NaCl-type and ZnS-type structures.View full abstractDownload PDF (660K) -
Kaizo Nakamura, Masami Fujita, Nobuhito Ohno, Snin-ichi Kondo, Yoshio ...1976 Volume 41 Issue 5 Pages 1636-1642
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPiezo- and wavelength modulated reflection spectra of the first exciton band of TlCl are investigated at liquid nitrogen temperature. Spectra of strain-induced changes in ε2 for hydrostatic, tetragonal and trigonal deformations are obtained. They indicate that minimum direct gap occurs at the X point in the Brillouin zone. Stress effects are interpreted by the theory based on the intra- and intervalley interactions of direct excitons at different X points. Under the [001] stress, piezo-spectrum for the polarization perpendicular to the stress direction consists mainly of energy shift of low energy component of the exciton doublet, while for the parallel polarization the spectrum consists of energy shift of high energy component. Spectral shapes of both components are deduced. Tetragonal deformation potential constant D13 is estimated to be 2.1 eV.View full abstractDownload PDF (856K) -
S. R. Salinas, J. F. Nagle1976 Volume 41 Issue 5 Pages 1643-1649
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTo further understanding of the large dielectric anomaly in layered SnCl22H2O (SCD) calculation are performed on a layered Ising model with strong ferroelectric interactions within the hydrogen bonded planes and weak antiferroelectric interactions between planes. Series expansions are performed for nearest neighbor interactions and a layered mean field approximation is developed in which only the weak interplanar interactions are replaced by a mean field. The layered mean field approximation is shown to agree very well with the series expansions provided one is not too close to the transition. Comparison with experiment on SCD leads to a small dipole moment interacting with external fields of the order of 0.12 Debye, which indicates very small displacements of the heavy atoms at the transition. The model reproduces the effective critical exponent γ=7⁄4 in the region in which it is measured. With the hypothesis that SCD is antiferroelectric, the calculations lead to the estimate that the ratio of the strength of the interplanar interactions to the intraplanar interactions is only 10−5 to 10−6.View full abstractDownload PDF (936K) -
Yoshihiro Ishibashi, Vladimir Dv\v{o}rák1976 Volume 41 Issue 5 Pages 1650-1658
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFeatures of domain walls in improper ferroelectrics are theoretically studied on the basis of a simple one dimensional model. The spacial dependence of order parameters within the walls and the wall energy were calculated numerically as the functions of two model parameters. It has turned out that the dependences of antiphase domain wall and ferroelectric domain wall on one of the model parameters are quite different.View full abstractDownload PDF (984K) -
Yasutaka Nagae, Mitsuo Wada, Yoshihiro Ishibashi, Yutaka Takagi1976 Volume 41 Issue 5 Pages 1659-1662
Published: November 15, 1976
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRaman scattering spectra of Ca2Sr(C2H5CO2)6 and Ca2Pb(C2H5CO2)6 were studied in the frequency range up to 2000 cm−1 and in the temperature range between −200°C and 150°C. No soft mode was observed. As a result, it is concluded that the phase transition of both materials is of order-disorder type.View full abstractDownload PDF (348K) -
Toshihisa Yamaguchi, Katsumi Hamano1976 Volume 41 Issue 5 Pages 1663-1669
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electrostrictive constants Q122, Q222 and Q322 of NaNO2 have been obtained in the para- and antiferroelectric phases by measuring the change in the dielectric constant caused by the application of a uniaxial stress. It has been found that there is a remarkable difference between the isothermal electrostrictive constant Qi22T and the adiabatic one Qi22σ. The difference is so great that the signs of Q122T and Q122σ are opposite to each other over a certain temperature range above TN. Further the electrostrictive constants show pronounced temperature dependence near TN, which is ascribed to the critical behavior of the electric susceptibility in this temperature region. An equation is derived which gives the pressure dependence of the transition temperature in terms of the electrostrictive constants.View full abstractDownload PDF (932K) -
Katsumi Hamano1976 Volume 41 Issue 5 Pages 1670-1678
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA phenomenological theory of the electromechanical properties of order-disorder type ferroelectrics is developed. The theory takes into account properly the role of an ionic polarization which interacts with a dipole system. Based on Onsager’s equation of motion, the complex electric susceptibility, piezoelectric and elastic compliance coefficiencts are derived. Some examples of numerical calculation are shown. The results can explain the anomalous static and dynamic properties of the piezoelectric constants of NaNO2, AgNa(NO2)2, Ca2Sr(C2H5CO2)6 etc., and also the anomalous temperature dependence of the elastic compliances measured at constant polarization in Ca2Sr(C2H5CO2)6 and Ca2Pb(C2H5CO2)6.View full abstractDownload PDF (1000K) -
Kazuyuki Itoh, Hironori Matsunaga, Eiji Nakamura1976 Volume 41 Issue 5 Pages 1679-1680
Published: November 15, 1976
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSCrystal structure analysis of SbSI in the ferroelectric phase has been made at 1.3°C by using full three-dimensional Bragg reflection data collected with X-ray automatic four-circle diffractometer. The discrepancy factor is 0.030. The atomic shifts from the positions in the paraelectric phase take place along the ferroelectric c-axis by 0.103 Å for Sb atoms and 0.019 Å for S atoms. A large thermal parameter of 0.16 Å in amplitude is seen for Sb atoms along the c-axis. The split atom method has shown that the nature of the phase transition is very close to the displacive type.View full abstractDownload PDF (280K) -
M. J. Tello, E. H. Bocanegra, J. Peraza, J. Manas-Diaz1976 Volume 41 Issue 5 Pages 1681-1683
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn equation of state for the ferro-paraelectric phase transition of T.G.S. near Tc with the incorporation of the tunnel effect is presented. The influence of this effect is very small but enough to get an equation of state which is in complete agreement with the experimental results in the temperature range where the M.F.A. predictions for the critical exponents are satisfied.View full abstractDownload PDF (344K) -
Hikaru Araki, Toshiyuki Ninomiya1976 Volume 41 Issue 5 Pages 1684-1691
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA stochastic theory of dislocation motion in an impurity field is developed. Unpinning process of a dislocation segment is treated as motion of one particle, where the flexible nature of the dislocation is taken into account by introducing an effective external stress. For large viscosity case, the problem reduces to that of diffusion. The steady motion of the dislocation is obtained as a function of external stress, impurity potential, and temperature. It is found that in medium stress range the velocity is proportional to high power of external stress as obtained experimentally. The impurity concentration dependence is also discussed. The results are compared with experiments to give a sufficient agreement.View full abstractDownload PDF (844K) -
Toru Matsuo, Hideji Suzuki1976 Volume 41 Issue 5 Pages 1692-1698
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe thermal conductivity of deformed crystals of bismuth and its dilute alloys has been measured as a function of temperature from 1.5 to 20 K. Most crystals were deformed by compression so as to cause slip on the glide systems (111)[10\bar1] and (001)[1\bar10]. The other crystals were deformed by rapid compression or bending in order to cause mechanical twinning. The thermal conductivity of dilute alloy crystals is lower than that of pure crystals around the temperature at which the maximum thermal conductivity occurs. The plastic deformation results in large decrease of the thermal conductivity on the low temperature side of the maximum. Dislocations of the order of 107 cm−2 decrease the thermal conductivity to about 20% of that of an undeformed crystal, while the twin boundaries of the order of 10 cm−1 decrease the conductivity to about 30%.View full abstractDownload PDF (844K) -
Akio Kotani, Yutaka Toyozawa1976 Volume 41 Issue 5 Pages 1699-1706
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spectrum of resonance Raman scattering is calculated for a system consisting of a localized electron and the lattice vibrations coupled weakly through quadratic interaction. Dynamics of relaxation process in the resonantly excited intermediate state is treated by means of the resolvent expansion method. The structures of successive terms in the expansion are analysed so as to clarify how the multiple phonon scatterings in the intermediate state breed the luminescence character of the spectrum. The whole spectrum consists of a term representing Rayleigh scattering, a term having both characters of Raman scattering and luminescence and terms representing luminescence, corresponding to zero-, one- and multi-step phonon scatterings, respectively. The relation to the phenomenological and stochastic-theoretical treatments of the same problem is discussed. Temperature-dependence of the line shape is calculated numerically for typical cases.View full abstractDownload PDF (972K) -
Jimpei Harada, Haruo Suzuki, Sadao Hoshino1976 Volume 41 Issue 5 Pages 1707-1715
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIntegrated intensities for the Bragg reflections of neutrons from CuBr single crystal with zincblende structure were measured at several temperatures. The experimental data both at room temperature and higher temperatures were interpreted consistently in terms of Matsubara’s representations for anharmonic Debye-Waller factor. The harmonic and cubic anharmonic potential parameters for each atom obtained by the least squares refinement are αCu=0.937, αBr=1.49 (×10−12 erg Å−2) and βCu=1.00 (×10−12 erg Å−3). A discrepancy was found between the harmonic component of the mean square displacement of the Cu atom and that calculated from the phonon dispersion relation reported in Part I. In view of the lattice dynamical study by inelastic neutron scattering, the effects of the quartic anharmonicity which were ignored are considered to be included in the harmonic component determined in this analysis.View full abstractDownload PDF (1128K) -
B. C. Saha, Jayasri Chaudhuri, A. S. Ghosh1976 Volume 41 Issue 5 Pages 1716-1723
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn integral form of the close coupling equation has been employed investigate the high energy behaviour of the elastic and 2s excitation cross sections of hydrogen atom by electron impact retaining the 1s and 2s states. The results, with and without exchange, for both the total and the differential cross sections are presented. The effects of exchange as well as of couplings to the 1s-2s states on the elastic cross section have been studied. The FBA results for the elastic cross section differ from the present results appreciably in the energy range 100 to 200 eV where FBA is considered to be valid. On the other hand, the present 1s-2s excitation results are very close to the corresponding FBA results in the said energy region.View full abstractDownload PDF (804K) -
Shigeo Hayashi, Kozo Kuchitsu1976 Volume 41 Issue 5 Pages 1724-1732
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA multiple-scattering formulation is given for the elastic scattering of electrons by a molecule, which is expressed by a sum of one-center long-range potentials and multicenter short-range potentials. The scattering amplitude for each potential is expressed using the partial wave method, and tractable formulae are given for the cross sections.View full abstractDownload PDF (900K) -
Naoshi Hishinuma1976 Volume 41 Issue 5 Pages 1733-1738
Published: November 15, 1976
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe velocity dependence of the integral cross section for scattering of H atom by H2 molecule was measured in the velocity range 1.62 to 5.76 km/sec. For detection of H atoms a ZnO single crystal was used, which showed high sensitivity and selectivity for H atoms. The experimental data were analyzed in terms of the three parameter exp (α, 6) potential, by combining the data with absolute integral cross sections measured by Gengenbach et al. for D–H2 scattering. The exp(12,6) potential (α=12, ε=1.78 meV, Rm=3.52 Å) and the exp (13, 6) potential (α=13, ε=2.10 meV, Rm=3.42 Å) reproduced the experimental results equally well (ε is the well depth and Rm the location of the potential minimum). Further measurements at lower velocities were found to be essential for the unique determination of the parameters.View full abstractDownload PDF (776K) -
Toshitaka Idehara, Mitsuyoshi Takeda, Yoshio Ishida1976 Volume 41 Issue 5 Pages 1739-1744
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe dispersion relation of Bernstein wave in an electron beam-plasma system is analyzed numerically. Electrostatic instability of the wave occurs as the result of interaction with a slow space charge wave or a slow cyclotron wave beam, while interactions with a fast space charge wave and a fast cyclotron wave of beam result in a strong damping of waves The behavior of the instability is investigated in detail as a function of plasma and beam parameters. It is shown that these are consistent with the previous experimental results.View full abstractDownload PDF (708K) -
Shobu Kaneko, Yasuyuki Miyauchi1976 Volume 41 Issue 5 Pages 1745-1748
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNewcomb’s method for obtaining the necessary and sufficient condition for hydromagnetic stability is applied to the linear Bennett pinch of length 2πR. The longitudinal magnetic fields Bz inside and outside of the pinch are assumed to be opposite directions. The stability condition for the kink mode, some disturbances are stabilized and others are destabilized by reversing Bz field. However, the stability condition for all kink disturbances does not change from that of the parallel-Bz pinch. The necessary and sufficient condition for the stability of the Bennett pinch with reverse Bz is same as the one for the parallel-Bz pinch.View full abstractDownload PDF (536K) -
Masafumi Kito, Toshihisa Honma1976 Volume 41 Issue 5 Pages 1749-1756
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn the toroidal coordinates, a stability analysis is presented for a toroidally symmetrical, sharp boundary plasma. The beta ratio β and aspect ratio, Rp⁄rp, are assumed to be arbitrary. In the equilibrium, the maximum poloidal beta ratio βp is evaluated as Max βp=1⁄2 (Rp⁄rp+1). For the kink mode, Curves of β vs a safety factor q and curves of βp vs β in the marginal stability are described for the several aspect rations. Both curves show that the stable region for a fat plasma is wider than for a slender one. The curve of β vs q depends on the aspect ratio even at β=0, and the plasma is unstable for all values of q, if a value of β exceeds a critical value.View full abstractDownload PDF (764K) -
Kyoji Nishikawa, D. D. Ryutov1976 Volume 41 Issue 5 Pages 1757-1765
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe relaxation of kinetically unstable relativistic electron beam in plasma with random density inhomogeneities is studied. Their effect is treated as angular diffusion of resonantly excited Langmuir waves in the wavenumber space. Formulas effective for obtaining the beam energy deposition rate and the Langmuir-wave fluctuation spectrum are presented. The result shows a strong reduction of the energy relaxation rate due to diffusion of Langmuir waves from linearly unstable region to the region where they are damped by the beam itself. The model attributing the formation of random density inhomogeneities to the modulational instability of the Langmuir condensate produced by the beam plasma interaction is used to estimate self-consistently the level of inhomogeneities.View full abstractDownload PDF (1124K) -
Motomasa Fuse, Setsuo Ichimaru1976 Volume 41 Issue 5 Pages 1766-1773
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe consider a transverse component of a nonlinear current produced by coupling between longitudinal excitations in the plasma. The spectral and angular distribution of electromagnetic radiation arising from such a nonlinear current is calculated within the dipole approximation: the electromagnetic boundary conditions at the plasma-vacuum interface are explicitly taken into account. The intensity of such radiation depends strongly on the propagation characteristics of the transverse current in the plasma. As a specific example, radiation produced by coupling between the electron plasma oscillations and the ion-acoustic waves is considered.View full abstractDownload PDF (880K) -
Naruyoshi Asano, Katsunobu Nishihara, Kazuhiro Nozaki, Tosiya Taniuti1976 Volume 41 Issue 5 Pages 1774-1777
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that when the thermonuclear reaction is weak, a thermonuclear reaction wave is governed by the modified Burgers equation with instability and the auxiliary equation which determines the density of high energy α particles. Using these simplified equations, we represent the ignition condition and the steady-state structure of the reaction wave, where the effect of finite α-particle range is included.View full abstractDownload PDF (496K) -
Lokenath Debnath, Madhubala Agarwal, Madhabi Datta1976 Volume 41 Issue 5 Pages 1778-1782
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA study is made of the dynamic response of β-plane shallow ocean to arbitrary and special wind stress distributions acting at the free surface of the ocean. The integral solution for the free surface elevation of the three dimensional ocean model is obtained by using Laplace and generalized double Fourier transforms. Special attention is given to the dispersion relation and the ratio of the Coriolis frequency and the frequency of the applied disturbances. The barotropic response of the Indian Ocean to onset of the Southwest consoon is described. An asymptotic analysis is made for the free surface flows to determine the ultimate steady state solution. The principal features of the ultimate oceanic response with and without β-effect are discussed. It is shown that the β-effect has dominant influence on oceanic motions.View full abstractDownload PDF (604K) -
Haruhiko Takada1976 Volume 41 Issue 5 Pages 1783-1791
Published: November 15, 1976
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn investigation is made on the possibility of the application of Hess’ surface source model to the separated flow past bluff bodies. Satisfactory results are obtained for the case of a two-dimensional flat plate placed normal to the uniform stream. Hess’ theory is then extended to the case of and axisymmetric body with a disk nose. The application of this theory to the separated flow past a disk leads to somewhat less satisfactory results as compared to the normal flat plate. The most serious defect of the present theory is an appearance of an infinite velocity at the edge of the body.View full abstractDownload PDF (756K)