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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
- Proceedings of the Tokyo Mathematico-Physical Society. 2nd Series
- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
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Volume 44, Issue 1
Displaying 1-50 of 63 articles from this issue
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Jen-Chang Chou, Chen-Ming Fou, Chia-Shou Lin, Ping-Shen Song, Ming Wen ...1978 Volume 44 Issue 1 Pages 1-6
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLow-lying excited states of 9Be and 9B were investigated in a kinematically complete 9Be(p, pn)8Be experiment. A pulsed beam and TOF technique was used for obtaining good time resolution and for the reduction of random coincidences along the n+p+8Be locus.
The (p+8Be) decay probability of the 2.36 MeV state of 9B was determined to be (19±5)%, while its analog state, the 2.43 MeV state of 9Be, decays (11±2)% into n+8Be when the γ-decay is neglected. The existence of the first excited state of 9B around Ex\simeq1.6 MeV cannot be confirmed. However, there is some evidence of a group of events on the p+n+8Be locus at Ex(9B)=2.1 MeV.View full abstractDownload PDF (772K) -
Jun Schimizu, Ryoichi Wada, Kazuo Fujii, Kiyohiko Takimoto, Jiro Muto1978 Volume 44 Issue 1 Pages 7-15
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe anomaly at 13.7 MeV (c.m.) in the 12C+16O system has been observed for the elastic scattering and the 12C(16O, α)24Mg reaction but not for the inelastic scattering. The angular distributions of the elastic scattering showed backward angle anomaly (BAA) and an analysis by using the parity-dependent optical potential model reproduces this BAA fairly well. A resonance analysis concerning this anomaly indicates that the most probable value of Jπ of this resonance is 8+. A discussion of the properties of this resonance is given.View full abstractDownload PDF (1072K) -
Takashi Maki1978 Volume 44 Issue 1 Pages 16-24
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe fluctuations in the cross sections of the reactions 55Mn(p, p) and 55Mn(p, p′) were studied for protons with bombarding energies from 4.240 MeV to 6.070 MeV. The cross sections of proton groups leading to the ground and also to the sixth excited states of 55Mn were analyzed on the basis of various correlation functions of the statistical theory and compared with statistical model predictions. Contributions of the direct reaction were estimated from the variance on the fluctuating cross sections, and from an analysis of energy-averaged angular distributions by means of the Hauser-Feshbach estimates. The sixth excited state at 2.199 MeV was assigned to 5⁄2− or 7⁄2− as the most probable spin-parity.View full abstractDownload PDF (1060K) -
Mitsutaka Kanazawa, Susumu Ohya, Tsutomu Tamura, Zyun-itiro Matumoto, ...1978 Volume 44 Issue 1 Pages 25-31
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe energy levels of 109Pd have been studied from the decay of 109Rh by using high-resolution γ-detector systems. A total of 35 γ-transitions were observed. From various coincidence studies on these transition, it is concluded that excited levels are populated at 113.4, 245.0, 266.3, 276.3, 291.4, 325.4, 326.8, 426.1, 491.7, 540.7, 597.3, 667.3, 983.4 and 1318.0 keV. The half-life of 113.4 keV level was determined as 380±50 ns. K conversion coefficients for a few low-energy transitions were determined. Spins and parties of most of the levels were deduced from β- and γ-transition properties combined with the previous studied on the (d, p) and (d, t) reactions.View full abstractDownload PDF (576K) -
Yoshihiro Ishibashi, Vladimir Dvorák1978 Volume 44 Issue 1 Pages 32-39
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe numerical solutions of the phase transitions under the existence of the Lifshitz invariant are presented. The temperature dependences of thermodynamic potential and dielectric susceptibility are shown for some values of coefficients appearing in a model thermodynamic potential. The feature of space modulation of order parameters is also shown. The results will be discussed in the relationship with some ferroelectric materials in which the incommensurate phase is actually realized in some temperature range.View full abstractDownload PDF (776K) -
M. N. Sharma, A. K. Singh1978 Volume 44 Issue 1 Pages 40-42
Published: January 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSUsing Debye theory of specific heat and following Slater’s theory, the volume dependence of Poisson’s ratio (σ) has been mathematically expressed involving Grüneisen constant (γ). It has been inferred that σ does not vary uniformly with volume in all the ionic crystals.View full abstractDownload PDF (272K) -
Antonio Pires, Daniel Hone1978 Volume 44 Issue 1 Pages 43-48
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPreviously measured magnetic susceptibility and specific heat of powder samples CoCl2·2NC5H5 are compared with a theory for ferromagnetic Ising spin 1/2 chains weakly coupled by Ising antiferromagnetic interactions to their nearest neighbor chains. The weak interchain interaction is first treated within mean field theory; later short range order effects are included approximately via a reaction field formalism. Each chain, in its (approximate) effective field is treated exactly. Good agreement with experiment for both χ and Cp is found with the following parameters: intrachain exchange J=10.8 K; interchain exchange J′=0.175 K; principal values of the g tensor, g⁄⁄=7.0 and g⊥=5.0.View full abstractDownload PDF (804K) -
Hisanao Sato1978 Volume 44 Issue 1 Pages 49-53
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theory of temperature fluctuations in equilibrium systems is developed on the basis of the theory of steady states proposed by the author. The correlation length of the temperature fluctuations in one-dimensional systems is found to be given by a square root of a product of the thermal diffusivity of the system and the relaxation time defined for heat transfer from the system to heat bath. The noise power spectrum originated from the temperature fluctuations modulating the resistance is found to depend not only on the temperature coefficient of the resistivity, but on the relaxation time and the thermal diffusivity.View full abstractDownload PDF (548K) -
Makoto Kaburagi1978 Volume 44 Issue 1 Pages 54-62
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ground state of the square lattice gas model with up to 3rd neighbor interactions is investigated by the use of method of geometrical inequalities. The structure of the ground state at an arbitrary value of the coverage is determined in the full regimes of the interactions. Various ordered structures are obtained. Several examples of the adsorbate system are discussed on the basis of the present results. A certain amount of informations about the adsorbate interactions is deduced from exprimental observation of the sequence of the ordered structures appearing in adsorption.View full abstractDownload PDF (1112K) -
Tomoyuki Miyazaki1978 Volume 44 Issue 1 Pages 63-70
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLandau’s laminar model is generalized to the case of a plate with finite thickness d by considering the mutual influence of its both-side surfaces. By using a modified Schwartz-Christoffel transformation and a conformal mapping, the parametric expression of N-S boundaries has been derived. The quantities, such as domain period and fraction of the normal phase, which realize the feature of laminae are given in the form of parametric expression. The computed result based on free energy minimization depends on characteristic parameter Δ⁄d, where Δ is the surface energy parameter. It is also shown that the present result agrees with the experimental result by Davies on the reduction of the critical field of a thin plate in a perpendicular magnetic field.View full abstractDownload PDF (852K) -
Motohiko Saitoh, Takayuki Aoki1978 Volume 44 Issue 1 Pages 71-79
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTheoretical analysis is given of the non-linear transport of electrons bound on the liquid 4He surface by the classical image force, the external holding field and the repulsive barrier of the liquid. The Boltzmann transport equation is solved in the effective electron temperature approximation, where the electron-ripplon and electron-He vapor interactions are considered as the dominant scattering mechanisms. Inter-subband as well as intra-subband transitions are fully taken into account in order to calculate mobility at high drift electric fields. Good agreement is obtained between theory and available experimental data of high temperature, and dramatic non-linear behaviors are predicted to occur in the low temperature region.View full abstractDownload PDF (984K) -
Kenji Makoshi, Tôru Moriya1978 Volume 44 Issue 1 Pages 80-88
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe self-consistent renormalization theory of spin fluctuations as developed previously for ferro- and antiferromagnetic metals is extended to the case of a helical spin structure with the use of a model for the dynamical susceptibility χ0(q, ω) of the noninteracting system. The magnetic properties of MnSi having a helical spin structure of a long period below TC=29 K are discussed on the basis of this theory.View full abstractDownload PDF (956K) -
Akio Kanbayasi1978 Volume 44 Issue 1 Pages 89-95
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic torque measurements were made on a pseudo-cubic perovskite crystal of SrRuO3 having Tc≅150 K and the magnetic easy axis of ⟨110⟩. Torque curves measured showed discontinuities at certain angular directions which coincided with the principal directions of the pseudo-cubic frame. These are interpreted as a manifestation of the crystallographic and magnetic multi-domain structure of the sample crystals. The apparent non-collinear spin ferromagnetic behaviors so far observed on polycrystalline specimens could be explained by this multi-domain model based on the high magnetocrystalline anisotropy. Both the ratio of the magnitudes of discontinuities observed in the torque curves and the amount of spontaneous moments are in fair agreement with the expected values.View full abstractDownload PDF (932K) -
Hironobu Fujii, Tsuneo Hokabe, Hiroshi Fujiwara, Tetsuhiko Okamoto1978 Volume 44 Issue 1 Pages 96-100
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic properties of (Fe1−xNix)2P single crystal compounds were studied by the measurements of magnetization, susceptibility and electrical resistivity. It was found that the Curie temperature takes a maximum at about x=0.1, while the magnetic moment decreases monotonically with increasing x and the compounds with x≥0.8 show the Pauli paramagnetism. The anisotropy constant K1 was found to decrease rapidly with increasing x and becomes almost zero near x=0.3. The exchange interactions in Fe2P are briefly discussed on the basis of the concentration dependence of Tc of this system.View full abstractDownload PDF (532K) -
Akio Yoshimori, Satoru Inagaki1978 Volume 44 Issue 1 Pages 101-107
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffects of the fourth order interactions among localized spins are analyzed somewhat in details in the fcc single band Hubbard model near the insulator limit. The longer range Heisenberg type interactions change the stable regions for the spin structures specified by the wave number. The four spin interactions lift the degeneracies of the structures with equivalent wave numbers to make them noncollinear. Discussion on the mixing of the structures with inequivalent wave numbers is given.View full abstractDownload PDF (808K) -
Akio Kanbayasi1978 Volume 44 Issue 1 Pages 108-113
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTo clarify the nature of the ferromagnetic interactions in SrRuO3, the Ru4+- -Ru4+ exchange couplings in cubic-perovskite type ARu4+O3 (A=nonmagnetic cation.) were investigated. Magnetic measurements were done on these sample oxides (including single crystals of CaRuO3) by using a magnetic balance technique. In contrast to the ferromagnetic behaviors in (Ca1−xSrx)RuO3 (x≥0.4), both the (La0.5Na0.5)RuO3 metallic and (Ca1−xMgx)RuO3 (x=0.1, 0.3 and 0.5.) semiconductive systems were found to be Curie-Weiss paramagnets having negative asymptotic Curie points. On the (Ca0.8Sr0.2)RuO3 sample, an anomalous hump of χ vs T curve was observed, which could be interpreted as being due to ferromagnetic clusters of Sr2+. It was suggested that, besides the 180° superexchange coupling, another indirect-exchange interaction via Sr2+ would be indispensable for the ferromagnetism in SrRuO3.View full abstractDownload PDF (724K) -
Kengo Adachi, Ryo Imura, Masaaki Matsui, Hiroshi Sawamoto1978 Volume 44 Issue 1 Pages 114-121
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe solid solution between ferromagnetic MnSb and paramagnetic NiSb, MnxNi1−xSb (0≤x≤1.0), with NiAs structure was synthesized in high pressure and high temperature atmospheres. The decomposition temperature was determined to be 420∼480 K. The critical concentration of ferromagnetism was obtained to be xc=0.65 at absolute zero. A new type spin glass state with double transition points, Tsg1 and Tsg2, was found in a wide range of 0.2≤x≤0.65 in the paramagnetic phase. The maximum transition point was estimated to be Tsg1=60 K and Tsg2=190 K. The electrical resistivity showed no anomaly corresponding to Tsg1 and Tsg2, and the temperature dependence in the spin glass state was given to be T2 and T3⁄2 at lower temperature. Some discussions are given for the experimental results.View full abstractDownload PDF (780K) -
Kan Usami, Tôru Moriya1978 Volume 44 Issue 1 Pages 122-132
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effects of magnetic field on itinerant electron antiferromagnetism are studied by using the self-consistent renormalization theory of spin fluctuations. The effects are shown to be particularly significant when the wave vector-dependent susceptibility χq0 without the electron-electron interaction, having a maximum at q=Q, has an additional competing peak at q=0. The magnetic field dependences of the Néel temperature, the staggered susceptibility and the nuclear magnetic relaxation rate, etc., are calculated. As a numerical example some results of calculations based on an electron gas model with Umklapp processes are shown.View full abstractDownload PDF (1148K) -
Shingo Ikeda, Taiichiro Haseda1978 Volume 44 Issue 1 Pages 133-138
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe paramagnetic relaxation in potassium ferricyanide has been investigated by the AC susceptibility measurement in the liquid helium temperature. The relaxation processes are different in several magnetic field range. In the high field region, there is the effect of the phonon bottleneck. In the middle field range, the direct process relaxation is dominant. On the other hand, in the low field range the relaxation time is strongly dependent on the spin concentration and is independent of the magnetic field strength. This cannot be derived from the phonon bottleneck, Raman relaxation process or the cross relaxation effect.View full abstractDownload PDF (636K) -
Kazuo Yamagata, Yoshinari Kozuka, Eiichi Masai, Masayuki Taniguchi, To ...1978 Volume 44 Issue 1 Pages 139-141
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurements of magnetization up to 20 kOe were made at 4.2 K. The obtained magnetization curves are, for the most part, similar to those of Cu(HCOO)2·4H2O, but the jump of the magnetization for H⁄⁄L2 occurs at 480 Oe, which is much lower than the corresponding field (5.3 kOe) of the 4H2O crystal. The interlayer coupling of the urea crystal is estimated to be about 1/20 of that of the 4H2O crystal.View full abstractDownload PDF (260K) -
Yoshio Kitaoka, Kôji Ueno, Kunisuke Asayama1978 Volume 44 Issue 1 Pages 142-147
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNMR signals due to Mn atoms with antiparallel moments to the host magnetization have been observed in NiFeMn and NiMn alloys. In NiFeMn alloys the dependence of the integrated intensities of resonance lines associated with the parallel and antiparallel moments on Fe concentration shows the critical number of Fe atoms surrounding Mn to reverse the moment of Mn to be 4∼5, which is in good agreement with the theoretical result. The magnitude of the antiparallel moment is estimated to be about 1.9 μB.
In NiMn alloys there appear three resonance lines due to two parallel and one antiparallel moments. The concentration dependence of the intensities of these three signals is measured and the origin of these signals is discussed.View full abstractDownload PDF (816K) -
Takao Maeda, Tetsuo Somura1978 Volume 44 Issue 1 Pages 148-153
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe thermoelectric powers of Ni–Fe alloys containing 30∼50 at.%Ni and pure Ni have been measured from 77 K to the Curie temperature as a function of the external magnetic field. The temperature dependence of the magnetic thermopower of the alloys with low Ni-concentration has been interpreted, with reasonable fitting parameters, in terms of Kasuya’s relation based upon the s-d exchange interaction model. A remarkable decrease in the thermopower due to the magnetic field was observed in the alloys over a wide temperature range. This magnetic field effect has been discussed from Kasuya’s relation.View full abstractDownload PDF (668K) -
Mitsuo Yamaga, Yoshikazu Hayashi, Hide Yoshioka1978 Volume 44 Issue 1 Pages 154-161
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe report details of the ESR study of (AgBrCl5)4− in AgBr0.001Cl0.999 crystals. Most of holes produced by the blue-light irradiation at low temperatures are self-trapped as the complex (AgCl6)4−. When the temperature is elevated, holes move in the crystal and are retrapped near Br ions forming (AgBrCl5)4−. Three principal values of the g tensor of (AgBrCl5)4− are obtained from the low temperature spectrum as indicative of a Jahn-Teller effect. The spectrum changes abruptly with increasing temperature. The high temperature spectrum shows that thermally activated reorientation occurs between two configurations of Jahn-Teller distortion.View full abstractDownload PDF (992K) -
Seikichi Matsumoto, Tsuneaki Goto, Yasuhiko Syono, Yasuaki Nakagawa1978 Volume 44 Issue 1 Pages 162-164
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic polar Kerr effect for the visible and near infrared light is measured on synthetic single crystals of Fe3O4 in the temperature range 90–300 K. The Kerr rotation angle undergoes a discontinuous change at the Verwey transition temperature, TV, near 120 K. The rotation angle vs wavelength curve in the visible range exhibits a blue shift below TV.View full abstractDownload PDF (356K) -
LEED Investigation on Temperature Dependence of Sublattice Magnetization of NiO (001) Surface LayersKazumichi Namikawa1978 Volume 44 Issue 1 Pages 165-171
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTemperature dependence of the exchange diffraction spot intensity from the cleaved face (001) of nickel oxide is measured for the cases of very small and comparatively large penetration depth of electron beam concerning the surface barrier resonance in LEED. The exchange reflexion intensity is corrected for the Debye-Waller factors in order to reveal the temperature dependence of the sublattice magnetization. The effective critical exponent of the sublattice magnetization is determined to be 0.89±0.01 as the proper value for the top-most surface layer. The thickness of the surface layers, which is characterized by the same value of the critical exponent as the top-most surface layer, becomes thicker than the mean absorption distance when the temperature is raised up to 0.9 in T⁄TN.View full abstractDownload PDF (976K) -
Jun Akimitsu, Kiiti Siratori, Gen Shirane, Masashi Iizumi, Tsuneo Wata ...1978 Volume 44 Issue 1 Pages 172-180
Published: January 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSNeutron scattering experiments have been carried out on a single crystal and powdered specimens of ZnCr2Se4, a helimagnet, above and below the transition at TN=21.2 K. Below TN, crystal belongs to D4h19. Atomic parameters of Se can be expressed by a single parameter, u=0.3847. Rather small magnetic moment (1.71 μB at 0 K) and the linear dependence of the length of the screw vector, Q0, on the lattice deformation were observed. Anisotropic critical scattering (Jx⁄Jy\simeq3) was measured around (4−Q0, 0, 0) above TN and Q dependence of the exchange interaction constant, J(Q), near Q0 was discussed. Recent studies by Plumier et al. were critically referred.View full abstractDownload PDF (1224K) -
Yoshinari Miyamoto, Mituji Hirata1978 Volume 44 Issue 1 Pages 181-190
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNew form silicon crystalline whiskers with polytypism have been grown by thermal decomposition of silane in an argon atmosphere at around 500°C on the gold plated surface of silicon crystal. Each whisker has a straight filamentary shape less than 1000 Å in diameter and several hundred microns in length for 40 minutes operation. It was found from the electron diffraction patterns that most of them can be deduced as having a 6H structure (hexagonal, a=3.84 Å and c=18.59 Å). Besides, the existence of some long-period structures was discovered on the diffraction patterns though they are not very common. A whisker grown at above 520°C has an outer crust of amorphous silicon. Raising the growth temperature converts these whiskers into fully amorphous ones. At above 800°C, normal whiskers with a diamond structure have been obtained. The structure of the amorphous whisker grown at intermediate temperature range can be accounted for by the mixture of diamond type and 6H type micro crystals.View full abstractDownload PDF (2132K) -
A. K. Singh, M. N. Sharma1978 Volume 44 Issue 1 Pages 191-195
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe appropriateness of the Born theory of ionic crystals is being successfully extended for alkali hydride crystals for which a little work is available in literature. A new form of overlap repulsion (P⁄r)e−kr2, where P and k are the parameters, has been suggested to study the lattice properties of hydrides. The parameters associated with the lattice energy function have been evaluated employing the well established equilibrium lattice conditions. The correctness of these parameters has been tested by computing the cohesive energy, compressibility, elastic constant and Grüneisen parameter etc. These theoretical values have been compared with the available observed data. The agreement is quite satisfactory keeping in mind the approximations involved in the present treatment.View full abstractDownload PDF (532K) -
Ikuo Maruyama, Ryumyo Onaka1978 Volume 44 Issue 1 Pages 196-203
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe energy distribution curves (EDC’s) of the electrons scattered by the evaporated films of twenty kinds of alkali halides are obtained by impact with low energy electrons of 10–30 eV. Stationary bands observed in the EDC’s are interpreted as the reflection of the high density of state levels in the conduction band. Energy loss structures due to the valence electron excitation are also observed in the EDC’s. Furthermore the structures observed in the yield spectra are found to relate with exciton formation, band-to-band transition, plasmon and double excitation of valence electrons.View full abstractDownload PDF (888K) -
Yasukazu Yoshizawa, Kiyoshi Shizuma, Toshiaki Fujita, Masato Nishi1978 Volume 44 Issue 1 Pages 204-210
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDoppler broadening method of positron annihilation (DOBPA method) is developed, and applied to the study of electronic structures of alkali halides. Radiation from positron annihilation in 14 kinds of alkali halide single crystals were measured with a Ge(Li) detector system. Observed Doppler broadened spectra were unfolded by computer, and intrinsic distributions were obtained. Electron momentum distributions were extracted from these distributions. To study anisotropy of the momentum distribution, radiation was measured along the [110] direction as well as along the [100] direction. Anisotropy of the momentum distribution was observed except for lithium halides and cesium halides. The strongest anisotropy was found in RbBr.View full abstractDownload PDF (636K) -
Shoichiro Sakoda1978 Volume 44 Issue 1 Pages 211-215
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe concept of excitonic polaron proposed by Otsuka is investigated, and its relation to electronic polaron theory initiated by Toyozawa is revealed with a generalized treatment, where the crystal electronic system is treated in terms of a Fermion-Boson transformation. From a qualitative estimate it is inferred that the effect of excitonic polaron in Ge prevails over that of electronic polaron at fairly high exciton number density.View full abstractDownload PDF (524K) -
Kazumi Kasai, Tsuguru Shirakawa, Chihiro Hamaguchi1978 Volume 44 Issue 1 Pages 216-224
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPrecise measurements of the magnetophonon effect in n-InSb are made by making use of a magnetic field modulation and phase sensitive second harmonic detection technique. Obtained data show an excellent signal to noise ratio and up to the 14th extremum are resolved in the transverse configuration at 77 K. Second derivative of the magnetoresistance in the longitudinal configuration is extensively investigated in the temperature range of 89 to 171 K. A curve resolver analysis is applied to resolve new structure which appears between the ordinary magnetophonon resonance peaks and four peaks around the N=2 peak are resolved, which are assigned to the structure arising from the spin-conserving single and two LO phonon processes. Fourier transform technique is also adopted to obtain frequency spectrum of the magnetophonon structure. The higher harmonic terms and two LO phonon components are resolved for the first time by using a proper window function for Fourier analysis. The results are consistent with those obtained by the curve resolver analysis.View full abstractDownload PDF (1176K) -
Yasuharu Makita, Toshio Osaka, Akio Miyazaki1978 Volume 44 Issue 1 Pages 225-229
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSUltrasonic velocities at 5 and 10 MHz and spontaneous strains of KD3(SeO3)2 were measured and the results were compared with those for KH3(SeO3)2. Elastic constants were obtained from the velocity data. The phase transition of KD3(SeO3)2 accompanies an instability of the soft s44 mode alone, as in the case of KH3(SeO3)2. Deuteration yields no significant isotope effect in the Curie-Weiss constant Cs, although it gives large isotope effect in the transition temperature Tc.View full abstractDownload PDF (520K) -
Kêitsiro Aizu1978 Volume 44 Issue 1 Pages 230-237
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEven when the (unmodulated) soft mode system comprises only a nondegenerate mode and hence the antisymmetrized square of the representation for it does not exist, incommensurate phases are possible. A theory is constructed for a substance like NaNO2 as an example. The same new thought is applied as recently done to K2SeO4. No ad hoc extra transition parameter needs to be brought in. “Lifshitz invariants” and other important terms are logically produced. Phases incommensurate along none or some of the x, y and z axes are deduced. The conditions are found that determine to which ferroic phase the prototypic phase should change by a second-order transition, Also, the mechanism is explained of the second transition, seen in NaNO2, from the phase incommensurate along the x axis to the totally commensurate ferroic phase.View full abstractDownload PDF (756K) -
A. V. de Carvalho, S. R. Salinas1978 Volume 44 Issue 1 Pages 238-243
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA Slater-Takagi basic model is constructed for the protonic order-disorder transition in the ferroelectric crystal PbHPO4. The essential feature of the structure of PbHPO4 and its isomorphs is the existence of infinite chains of hydrogen bonds with no protonic contacts between chains. A weak long-range interaction between chains has been added to the basic model in order to obtain spontaneous polarization, and the model was fit to data for PbDPO4 and PbHPO4 by varying two parameters. The agreement between the predicted value of the dielectric susceptibility and that derived from experimental data was better for PbDPO4 than it was between the corresponding values for PbHPO4.View full abstractDownload PDF (660K) -
Fujio Suda, Jun Hatano, Hideo Futama1978 Volume 44 Issue 1 Pages 244-249
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn TGS and TGSe, shapes of the domains growing under electric field have been investigated on the basis of Nakamura’s theory which offers the envelope constructed from elementary plane waves of growth. In the formula v=v∞exp(−δ⁄E) for the normal velocity v of sidewise wall motion under electric field E, the activation field δ has been assumed to be proportional to 3/2 powers of wall-energy density of σ′. The values of v in the various directions have been calculated with σ′ obtained from the Zhirnov-type continuum theory. The domain shapes and their dependence on the applied field have been determined with the calculated values of v. The results satisfactorily explain the experimentally observed lenticular and elliptical shapes in TGS and the restricted lenticular, lenticular and elliptical shapes in TGSe. It has been shown that there exist critical fields for the classification of these kinds of shape.View full abstractDownload PDF (720K) -
Wataru Kinase, Kouichi Okamoto1978 Volume 44 Issue 1 Pages 250-258
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPolarization reversal in BaTiO3 is discussed taking account of neutralizing electrons or ions upon the crystal surface. The neutralizing charges spread on the surface of one c-domain from another one separated by the 180°-type domain wall, and build up there a kind of wall of moderate or large (especially in liquid electrode) thickness, which plays an important role in the side-wise motion of the wall during the reversal process. Since the property of electrodes has a great influence upon the creation of the wall, the behaviour of the side-wise motion has the great difference among metal, semiconductor and liquid. The rapid side-wise motion in liquid electode can be attributed to the extensive thickness of the wall in this case. The origin of the central peak in neutron diffraction is discussed from the scope of the displacement of front walls and also the side-wise motion of this walls.View full abstractDownload PDF (1164K) -
Michisuke Kobayashi, Yûsaku Yamada1978 Volume 44 Issue 1 Pages 259-262
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ionic thermoelectric power of a superionic conductor is calculated using a lattice gas model in one dimension for the case where the lattice sites are 50% occupied. The calculated thermoelectric power is inversely proportional to the absolute temperature and the activation energy for ionic conduction is equal to the heat of transport. The results explain experiments fairly good.View full abstractDownload PDF (444K) -
Toshiyuki Ninomiya1978 Volume 44 Issue 1 Pages 263-268
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theory of melting is developed based on the dislocation model, in which liquid is regarded as a crystal saturated with dislocations. It is shown that introduction of dislocations is accompanied with lattice dilatation due to lattice anharmonicity. The dilatation makes the dislocation energy per unit length a decreasing function of the dislocation density, which is a necessary condition for first order transition. The vibration frequencies of segments of dislocation networks are estimated from excess specific heat of amorphous solid, and the contribution of the dislocation vibration to fusion entropy is shown to be important. Some empirical relationships are found to be compatible with the dislocation model.View full abstractDownload PDF (748K) -
Toshiyuki Ninomiya1978 Volume 44 Issue 1 Pages 269-271
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBased on the dislocation model developed in Part I, melting characteristics are calculated for a face centered cubic crystal, in which atoms interact with the inverse 4th, 6th, 9th and 12th power potentials. The results are shown to be in good agreement with those of computer simulation and of statistical mechanical calculations. It is also found that a body centered cubic crystal has quite similar melting characteristics as those of fcc crystal.View full abstractDownload PDF (300K) -
Ajay Gupta, K. Rama Reddy1978 Volume 44 Issue 1 Pages 272-274
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOn the basis of thermal spike model a theory has been constructed to account for the anomalously low recoilless fractions observed in the Coulomb excitation Mössbauer experiments. The f-factor is found to be a sensitive function of the time needed by the recoiling Mössbauer atom in settling down to a lattice site. The calculations show that there is no appreciable change in the spectral distribution of the Mössbauer radiation.View full abstractDownload PDF (356K) -
Ikuo Fujita1978 Volume 44 Issue 1 Pages 275-281
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOptical absorption bands induced by doping thallous ions in KDP single crystals are found at 5.56, 5.76, 6.91, 7.30, and 7.67 eV. They exhibit clear dependence on the polarization of light, reflecting the local symmetry of the impurity centers. Comparison is made between the observed bands in KDP and those in alkali halide crystals. The spectra are interpreted in terms of spin-orbit interaction in the thallium ions and the crystal field due to surrounding ions. Effect of lattice vibrations is also discussed with respect to the intensity and the structure of the absorption bands.View full abstractDownload PDF (820K) -
Nobuo Ueno, Yasuomi Hayasi, Setsuo Kiyono1978 Volume 44 Issue 1 Pages 282-285
Published: January 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe photoelectron spectra of coronene and pentacene polycrystals have been measured by the use of He I, Ne II and He II resonance radiations. The electron energy structures of valence electrons of these crystals were determined over the energy width of about 17 eV.
It was observed for coronene that the intensity of the photoelectron structures slightly depends on the energy of the incident photon, and that the second peak has two components which closely correspond to the molecular photoelectron structures. The origin of the dependence and the importance of the observation of the resolved second peak were discussed.View full abstractDownload PDF (404K) -
Takeyoshi Fujita, Tsuruji Iwai, Kiyosi Ogura, Sigeru Watanabe, Yoiti W ...1978 Volume 44 Issue 1 Pages 286-290
Published: January 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn review of the non-vanishing core potential, a correction is made on cross-sections by using a simple set of OCE MO’s of water molecule along the Glauber theory. It has been assumed that only one pair of charges can cast a dominant distortion on the incident electron in the frozen core model. The effective core potential is approximated by two terms: one a neutral Hartree potential of closed shell, and the other that of one hole in the orbital to be excited. A relatively small effect is found on the excitation cross-section from the core potential in particular in the high and medium energy regions of incident electron. Favourable improvements are obtained for the excitation function of the Lyman-α emission induced by electron impact.View full abstractDownload PDF (564K) -
Yoshitaka Beppu, Sigeo Yomosa1978 Volume 44 Issue 1 Pages 291-296
Published: January 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn order to examine the mechanism of nucleophilic attack of the Oγ atom of Ser-195 upon the carbonyl carbon of substrates during the acylation of α-chymotrypsin, the potential energy curves are calculated as functions of the rotational angle of the seryl Oγ about the Cα–Cβ axis. The CNDO/2 molecular orbital method is used for the calculations. The potential energy curves for substrate-free and substrate-binding enzymes have their minima at the same positions as those found by X-ray crystallographic method. It is shown from the potential energy curves that the seryl Oγ rotates by 120° about the seryl Cα–Cβ axis to form a tetrahedral intermediate. These results support the catalytic mechanism proposed by D. M. Blow et al.View full abstractDownload PDF (772K) -
Takanori Suzuki1978 Volume 44 Issue 1 Pages 297-300
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Hanle effect was studied on the xenon 6p01 level by using a xenon laser at 3.99 μm (5d00–6p01) and fluorescences of 979.9 nm (6p01–6s12) and 1083.8 nm (6p01–6s12) transitions. In addition to the intensity variation due to the Hanle signal and Doppler profile, a peculiar signal was observed which had a width of about twenty times the Hanle width of the 6p01 level. This signal is found to be independent of the coherence among the Zeeman sublevels of the 6p01 level.View full abstractDownload PDF (500K) -
Yoshitsugu Oono, Tomo-o Oyama1978 Volume 44 Issue 1 Pages 301-308
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn intuitive picture of the renormalization transformation of the monomer density field of a polymer chain is given. The picture is justified by the correspondence between complex spin function \varphi2 and monomer density field, which allows the field-theoretic calculation of the monomer density profile, the radius of gyration, etc. From the renormalization group approach the following conclusions are drawn: 1) a polymer chain can be phenomenologically described with two parameters, 2) the phenomenological two parameters are, however, complicated functions of many (not two) microscopic parameters, 3) the phenomenological parameter z is proportional to N1⁄2(lnN)3⁄22 near the theta point, where N is the length of the polymer, 4) there exists a class of weighted self-interacting walk models which is, at the theta point, globally gaussian but whose intrachain binary interaction does not vanish and is rather attractive.View full abstractDownload PDF (1004K) -
Mikio Mimura, Kei-ichi Hirano1978 Volume 44 Issue 1 Pages 309-313
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDamping of radial oscillation of a pinch is studied in a toroidal pinch machine, STP-2, in which no endloss of plasma exists. The plasma density ne is varied from 2×1015 to 1×1016/cm3, and the temperature from 5 to 30 eV. The oscillation is measured by a diamagnetic loop and the electron temperature by laser scattering. Observed damping time agrees with the MHD calculation in which resistive damping at low temperature and ion viscous damping at high temperature are important.View full abstractDownload PDF (596K) -
Isamu Nakata1978 Volume 44 Issue 1 Pages 314-320
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNonlinear Alfvén waves in a cold plasma in the presence of effective electron-ion collisions are investigated by means of a nonlinear perturbation method. To the lowest order of perturbation, it is found that the system of equations for the Alfvén waves can be reduced to the following simple dispersive-dissipative equation for f (which is proportional to perturbed part of normalized density):
(Remark: Graphics omitted.),
where ξ and τ are, respectively, stretched space and time coordinates, while μA and ν denote, respectively, dispersion and dissipation parameters. It is shown that this equation has solution representing either oscillatory (dispersion-dominant case) or monotonous (dissipation-dominant case) Alfvén shock waves.View full abstractDownload PDF (772K) -
Takao Yoshinaga, Shigeki Morioka1978 Volume 44 Issue 1 Pages 321-327
Published: January 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe steady, one-dimensional flow of a bubbly liquid through a convergent-divergent nozzle is investigated by taking account of the radial and translational motions of the bubbles relative to the surrounding fluid. Adequate parameters and distinguishable flow types are shown on the basis of the linearized theory for a nozzle flow with a slightly varying cross-section. Nonlinear perturbation theory is developed to find the flow behaviour near the critical flow rate. A possibility of the stream instability is also discussed.View full abstractDownload PDF (820K)