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Volume 50, Issue 9
Displaying 1-50 of 68 articles from this issue
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Yoshikazu Hayashi, Tatsuji Kato, Hideo Ogawa, Toshiaki Takano1981 Volume 50 Issue 9 Pages 2773-2774
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe effect of microwave radiation on the superconducting gap structures of niobium is investigated by the measurements of radio frequency noise in point contact. A number of gap and subgap structures are observed without microwaves. Intensities of these structures decrease and two new peaks are induced by 112 GHz microwave radiation.View full abstractDownload PDF (228K) -
Yutaka Watanabe, Toshiyuki Nishiyama1981 Volume 50 Issue 9 Pages 2775-2776
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe expression for the energy shift from the Feynman spectrum of liquid 4He is obtained up to the cubic term in the wave number p at very low wave numbers by expanding the coherent factors involved in the previous expression of the energy shift. The result obtained here gives rise to a shift of only the cubic dispersion term of the Feynman spectrum keeping the linear term of the wave number p unchanged. The Landau parameter of the energy spectrum denoted by γ remains negative, in other words the spectrum is concave at very low wave numbers.View full abstractDownload PDF (208K) -
Atsushi Ochi, Kohji Watanabe, Masao Kiyama, Teruya Shinjo, Yoshichika ...1981 Volume 50 Issue 9 Pages 2777-2778
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSurface magnetic properties of γ-Fe2O3 were studied with the Mössbauer emission spectra of the decayed 57Fe. The results suggested two surface anomalies: a steep temperature dependence of the surface hyperfine field and a non-collinear spin arrangement in the surface region.View full abstractDownload PDF (260K) -
Nobumori Kinoshita, Madoka Tokumoto1981 Volume 50 Issue 9 Pages 2779-2780
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNarrowing mechanism of an ESR (Electron Spin Resonance) line in undoped cis- and trans-polyactylene, (CH)x, are discussed based on the temperature dependence of the ESR linewidths and line shapes. In a high temperature region, the classical thermal motion of a soliton is found to be inadequate to explain the observed motional narrowing, and it is found necessary to take a diffusive motion into account.View full abstractDownload PDF (220K) -
Shohei Wakita, Yoshiro Suzuki, Masamitsu Hirai1981 Volume 50 Issue 9 Pages 2781-2782
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt has been observed that the quantum efficiency of the F center emission in KI near liquid helium temperature drops drastically at the high energy region beyond the F absorption band. This drop suggests that, when the F center is excited to a higher vibrational level than the crossing point of the excited state and the ground state, it has a large probability to make dynamical nonradiative transition to the ground state above the crossing point.View full abstractDownload PDF (264K) -
Kiyoshi Deguchi, Etsuo Okaue, Kohji Abe, Eiji Nakamura1981 Volume 50 Issue 9 Pages 2783-2784
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDilatometric measurements have been made for CsH2PO4 along the ferroelectric b-axis together with the measurement of the spontaneous polarization. The temperature dependence of the spontaneous strain is anomalous as it shows a maximum at about 10 K below Tc and changes its sign at about 35 K below Tc; this is inconsistent with the behavior of the spontaneous polarization in the framework of the usual phenomenological theory, but is similar to that of the spontaneous birefringence reported previously.View full abstractDownload PDF (248K) -
Mitsuo Wada, Hiroshi Orihara, Michio Midorikawa, Akikatsu Sawada, Yosh ...1981 Volume 50 Issue 9 Pages 2785-2786
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe effect of hydrostatic pressure on the ferroelectric phase transition in Li2Ge7O15 has been investigatied by the dielectric and Raman scattering measurements. The phase transition point Tc shows a linear dependence whose pressure derivative is positive (dTc⁄dP=1.46 K/kbar). In the ferroelectric phase a soft mode has been observed which evolves from underdamped to overdamped behavior as the pressure is reduced from high pressure side to 0.7 kbar at 291.5 K.View full abstractDownload PDF (196K) -
Seiji Kojima, Min-Su Jang, Kikuo Ohi, Terutaro Nakamura1981 Volume 50 Issue 9 Pages 2787-2788
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNear-forward Raman scattering measurements on Sr2Nb2O7 have been made for studying dispersion relation of phonon polaritons. In the low frequency region, the polariton effect has been observed for the amplitude mode located at 44 cm−1 and the mode located at 54 cm−1 at b(cc)b+Δa scattering geometry. The mode at 54 cm−1 shows remarkable softening and the line-broadening toward a ferroelectric phase transition at 1342°C when temperature is increased from room temperature.View full abstractDownload PDF (260K) -
Hironori Matsunaga, Eiji Nakamura1981 Volume 50 Issue 9 Pages 2789-2790
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric, thermal and X-ray diffraction measurements are performed for (NH4)2ZnCl4. Ferroelectric activity is confirmed below 270 K and two other phase transitions are found at 319 K and 406 K. Phase I (T>406 K) is the normal phase. Phase II (319<T<406 K) and Phase III (270<T<319 K) are paraelectric and antiferroelectric, respectively, with c=4c0, where c0 is a unit cell parameter of the normal phase. Phase IV (T<270 K) is the ferroelectric phase having c=3c0.View full abstractDownload PDF (236K) -
Yoshimasa Isawa, Yoshihisa Takeuti, Nobuo Mikoshiba1981 Volume 50 Issue 9 Pages 2791-2792
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that the mutual interactions in the presence of impurity scattering lead to lnT terms both in the conductivity and in the imaginary part of the self-energy function of the three dimensional electron gas.View full abstractDownload PDF (248K) -
Yasuji Kashiwase, Yoshiro Kainuma, Masayuki Minoura1981 Volume 50 Issue 9 Pages 2793-2794
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe film observation of a defect line caused by the 002 Bragg reflection of the thermal diffuse scattering of X-rays in a urea nitrate single crystal is reported. An excess line, the pair to the defect line, was observed clearly near the incident beam direction.View full abstractDownload PDF (292K) -
Choji Nakaya1981 Volume 50 Issue 9 Pages 2795-2796
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA new method of calculation is developed in order to find a stationary wave on a viscous fluid film flowing down a vertical wall. A Fourier series is used for expressing the free surface of the fluid film, and substituted into the surface height equation. A system of algebraic equations is obtained to determine the coefficients of the Fourier series. The calculation is carried for fixed Reynolds number and Weber number. It is found that the wave number and the wave speed of the stationary wave have very interesting features when the wave number becomes small.View full abstractDownload PDF (236K) -
Akira Sakurai, Akio Fukuyu1981 Volume 50 Issue 9 Pages 2797-2798
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe necessity for the study of the Oseen approximation to viscous gas flow is stressed in connection with actual problems such as for slip flow. Some general properties of the approximation are derived under a few assumptions to show how the results of usual Oseen approximation to incompressible flow be modified.View full abstractDownload PDF (164K) -
Study of the Cluster Characteristics in Hadron-Nucleus Interactions at Ultrahigh Cosmic Ray EnergiesDipak Ghosh, Jaya Roy, Sadhan Naha, Kaushik Sengupta, Madhumita Basu1981 Volume 50 Issue 9 Pages 2799-2803
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn this paper we have presented an investigation of cluster characteristics in nucleon-light nucleus and nucleon-heavy nucleus collision in emulsion at ultrahigh cosmic ray energies (above 1 TeV) following a model independent method proposed in a recent paper by Shivpuri et al. It has been observed that the cluster characteristic in both are not very different from those in case of nucleon-nucleon collision.View full abstractDownload PDF (512K) -
A. E. Stuchbery, C. G. Ryan, H. H. Bolotin1981 Volume 50 Issue 9 Pages 2804-2809
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe gyromagnetic ratio of the 3+ state (937-keV excitation energy) in 18F was measured by the time-integral IMPAC technique following implantation in a magnetically saturated Fe foil. The 16O(3He, pγ) reaction was employed using 3.75-MeV 3He+ beams. Measurements of the angular distribution of the de-excitation γ ray from this level to the ground state and of its precession in the hyperfine field were carried out in coincidence with backward-emitted reaction protons. The sign and magnitude determined for the g-factor of this state is g=+0.54±0.06. Shell-model calculations of the g-factor of this level have been performed and are evaluatively compared with experiment.View full abstractDownload PDF (740K) -
Kazuo Kato, Masaharu Hoshi, Yasukazu Yoshizawa1981 Volume 50 Issue 9 Pages 2810-2817
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRelative intensities of gamma rays of 166Er from the decays of 166mHo were precisely measured with a calibrated Ge(Li) detector. Errors of relative gamma-ray intensities are about 0.5% for strong gamma rays. Angular correlations for 11 cascades were measured with Ge(Li) and NaI(T1) detectors. The B(E2) ratios were deduced from the relative gamma-ray intensities and the adopted values of the M1 components. These ratios were satisfactorily explained by means of the band mixing treatment between the ground-state band and the gamma-vibrational band.View full abstractDownload PDF (776K) -
Shigeo Homma, Shozo Takeno1981 Volume 50 Issue 9 Pages 2818-2821
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDynamics and statistical mechanics of kinks in one-dimensional classical Ising model in a transverse field is studied in a dilute kink-gas approximation along the line with the theory of Krumhansl and Schrieffer. The energy of a single kink is written in a simple analytic form by approximating an exact one-kink solution. Kinks in the system are then treated as gas of quasi-particles. It is shown that the partition function so obtained is coincident with that of the result obtained previously by using the transfermatrix method. The dynamical structure of the system is also calculated to show the existence of central peak due to kink excitations.View full abstractDownload PDF (440K) -
Fumiaki Shibata, Yoko Hamano, Natsuki Hashitsume1981 Volume 50 Issue 9 Pages 2822-2828
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Boltzmann-Langevin equation for circularly-polarized-photons is derived in the coherent state representation. Damping and dispersion of photons interacting with a material system are determined in terms of kinetic coefficients.
A general method of calculating time-correlation functions of photons is formulated and applied to the present problem with intuitive results. The method incidentally enables us to obtain nonequilibrium Green’s functions which describe propagation of photons in a fluctuating medium.View full abstractDownload PDF (616K) -
Kenichi Nanbu1981 Volume 50 Issue 9 Pages 2829-2836
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe collision process described in the first paper of this series is written in the form of the stochastic difference equation for a molecular velocity. By using this stochastic equation the correlation of velocity between a molecule and its collision partner is examined. It is shown that the correlation grows stronger as τ⁄N increases, where τ is the time and N is the number of simulated molecules. The assumption of molecular chaos requires a negligibly small correlation, so that the condition τ⁄N<<1 is necessary for solutions of the stochastic difference equation to agree with solutions of the Boltzmann equation.
Also, the correlation coefficients of the velocities at two time points are obtained. Suppose that N>>1 and τ⁄N<<1. If these velocities belong to a single molecule, the coefficient is exp (−θη)+O(N−1), and if they belong to different molecules, the coefficient is of O(N−1), where θ is a constant and η is the interval between the time points.View full abstractDownload PDF (780K) -
Hideaki Matsuyama, Yukio Okwamoto1981 Volume 50 Issue 9 Pages 2837-2843
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAlternation parameter δ dependences of the ground-state energy (GE) ε(δ) and the gap Δ(δ) in the excitation spectrum of the spin Hamiltonian
(Remark: Graphics omitted.)
are calculated in two numerical methods, with interest in the exponents β of the GE and α of the gap which are defined as ε(δ)−ε(0)∝δβ and Δ(δ)∝δα for small δ. First by means of the 2-level renormalization group calculation the exponents are obtained as β∼1.78 and α∼0.96 for the isotropic Heisenberg model (σ=1). Second by means of the finite chain extrapolation, β for σ=1 is obtained as 1.68−0.36+0.13 from the data of the extrapolated GE between δ=0.05 and 0.1.View full abstractDownload PDF (780K) -
Koichi Kato, Shuichi Iida1981 Volume 50 Issue 9 Pages 2844-2850
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetoelectric effects of magnetite at 4.2 K were measured by applying magnetic field with both dc and ac methods. Analyses of the signals indicate that the magnetic crystal symmetry at 4.2 K is nearly monoclinic but exactly triclinic. The results of ac measurements at different magnitude of the applied magnetic field suggest that the electric poralization is induced mainly by the rotation of the magnetization. The polarization along the b-axis, however, can not be explained by this mechanism only.View full abstractDownload PDF (840K) -
Shuichi Otake, Masayuki Momiuchi, Naoshi Matsuno1981 Volume 50 Issue 9 Pages 2851-2854
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic susceptibility of bismuth has been measured at temperatures from 450 K to 550 K through the melting point (544 K). Considering the local level into the T-point band gap of the Brillouin zone due to thermally generated vacancies and the increase of hole concentration, we have explained the temperature dependence of the magnetic susceptibility at higher temperatures. The local states lie at 0.28 eV above the Fermi level, and the thermal excitation of valence band electrons to the local states would produce the additional holes, whose number is estimated about 6×1017 cm−3 at the melting point (544 K).View full abstractDownload PDF (376K) -
Hidenori Kubo, Yoshio Suzuki, Takuya Akitomi, Kazuo Tsuru1981 Volume 50 Issue 9 Pages 2855-2864
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe bromine NMR studies in the magnetically ordered state of (CH3NH3)2Cu(Cl1−xBrx)4 (0.03≤x≤0.85) are carried out. The parameters in the bromine nuclear spin Hamiltonian at 0 K are determined by comparing the NMR shifts with the spin wave theory. The hyperfine fields and the quadrupole frequency are nearly independent of the concentration of Br− ions. In addition to the hyperfine fields due to s- and pσ-orbitals, the anisotropic fields caused by the second order perturbation through the spin-orbit interaction are also observed. The unpaired spin density of Br− ion of the pσ-orbital is estimated. The parameter of π-bond is discussed.View full abstractDownload PDF (1316K) -
Noriko Akutsu, Hironobu Ikeda1981 Volume 50 Issue 9 Pages 2865-2871
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe report experimental results and careful analysis on high precision measurements of magnetic specific heat capacities Cp of three-dimentional (3D) antiferromagnets, CoF2, MnF2 and KMnF3 by means of AC calorimetric method. CoF2 behaves like a 3D Ising antiferromagnet in the entire critical region near the Néel temperature TN. On the other hand, a careful analysis of the experimental data in the temperature region very close to TN of both MnF2 and KMnF3 shows an interesting phenomenon. On approaching to TN, a crossover from 3D Heisenberg behavior to 3D Ising one is observed.View full abstractDownload PDF (824K) -
Hitoshi Yamazaki, Yukio Morishige, Mamoru Chikamatsu1981 Volume 50 Issue 9 Pages 2872-2875
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFerromagnetic resonance and parallel pumping experiments in K2CuF4 are investigated at 9 GHz and in the temperature range from 4.2 to 1.4 K. Temperature dependence of a weak fourfold anisotropy in the c-plane is measured. The anisotropy field extrapolated to T=0 K is 5 Oe. Resonance linewidth ΔH0 and spin-wave linewidth ΔHk have also fourfold anisotropy.View full abstractDownload PDF (460K) -
Mamoru Chikamatsu, Motoyuki Tanaka, Hitoshi Yamazaki1981 Volume 50 Issue 9 Pages 2876-2883
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAntiferromagnetic resonance experiments on (C2H5NH3)2CuCl4 with various-shaped samples have been performed in the frequency range of 0.8 to 8 GHz at T=1.4 K. The experimental results can be understood over the wide frequency range by the theory including the surface demagnetizing field, the Lorentz field and newly introduced magnetic dipolar anisotropy field which changes with canting angle between sublattice magnetizations. Following parameters are determined: antiferromagnetic interlayer exchange field HE′=829 Oe, orthorhombic anisotropy fields are 74 Oe and 1950 Oe in antiferromagnetic phase and 73 Oe and 1504 Oe in field-induced paramagnetic phase.View full abstractDownload PDF (892K) -
Susumu Chikazawa, C. J. Sandberg, Yoshihito Miyako1981 Volume 50 Issue 9 Pages 2884-2890
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSLinear (χ0) and nonlinear (χ2) susceptibilities of (Ti1−xVx)2O3 have been studied in detail around the spin freezing temperature Tg. The measurement on single crystal has revealed that both χ0 and χ2 are highly anisotropic. The linear susceptibility χ0 shows a cusp at Tg. The nonlinear susceptibility χ2, which is observed as the third higher harmonic of the applied ac field (h=h0 sin ωt), shows the very sharp peak in the vicinity of Tg. The frequency ν(=ω⁄2π) and amplitude h0 dependence of χ2 has been measured in detail to study the critical behavior around Tg in the static limit ν→0 and in the infinitesimal field strength h0→0. |χ2| increases rapidly with decreasing ν and h0, which implies the divergence of χ2 at Tg in the limit ν→0 and h0→0.View full abstractDownload PDF (740K) -
Hiroshi Takano, Ayao Okiji1981 Volume 50 Issue 9 Pages 2891-2899
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic structure at the ground state of the single band Hubbard model is investigated. The extended Gutzwiller method is adopted. It is found, if the intra-atomic Coulomb integral is sufficiently large, that the ferromagnetic or antiferromagnetic ground states are obtained at nearly half-filled band in the cases of the simple cubic and body centered cubic structures and that the ferromagnetic ground states are obtained at more than half-filled band in the cases of the face centered cubic and hexagonal closed packed structures.View full abstractDownload PDF (1128K) -
Yûichi Tazuke, Kenshi Watanabe, Takeshi Suzuki1981 Volume 50 Issue 9 Pages 2900-2903
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPolycrystalline samples of TixV3−xS4 were prepared in 0≤x≤3. For x≤2.0 metal vacancies are in an ordered arrangement and for x≥2.5 they are disordered. Magnetic susceptibility χ follows the equation χ=χ0+C⁄(T−θ). The Curie constant increases linearly with x for x≤2.0 and corresronds to the magnetic moment of ∼0.7 μB/Ti. C is very small for x≥2.5. Discussions are made about the Curie-Weiss term in conjunction with the structural phase transition.View full abstractDownload PDF (352K) -
Takeshi Shinohara, Katuji Sasaki, Hiroshi Yamauchi, Hiroshi Watanabe, ...1981 Volume 50 Issue 9 Pages 2904-2908
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSResults are presented of X ray, magnetic and the Mössbauer effect measurements on cold worked Pd2MnSn which shows a remarkable reduction in magnetization. Most of the reduced magnetization is recovered when the strain is released by annealing of the specimen at temperatures below 400°C, where no appreciable recovery of the chemical order takes place. This fact means that the reduction in magnetization is related to the severely stressed state rather than to the atomic order.View full abstractDownload PDF (580K) -
Shûzi Harada, Taiji Sohmura, Fransisco Eiichi Fujita1981 Volume 50 Issue 9 Pages 2909-2916
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSCarburized and hydrogenated fcc Fe–Ni Invar alloys were studied by means of 57Fe Mössbauer spectroscopy. The characteristic weak ferromagnetic part in their spectra disappears by carburization, and, at the same time, a new component with an internal field considerably smaller than that of the main component appears. The former behaviour is compared with a similar effect of hydrogen and discussed on the basis of the electron theory. The spectral analysis reveals that the new component arises from the iron atoms first-neighbouring with carbon atoms. This effect is similar to that found in the bcc Fe–Ni alloys and accounted for along the same line.View full abstractDownload PDF (1072K) -
Gendo Oomi, Nobuo Mori1981 Volume 50 Issue 9 Pages 2917-2923
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe bulk moduli of Fe70Ni30, Fe65Ni35 and Fe72Pt28 Invar alloys are obtained by measuring the lattice constants under high pressure up to about 100 kbar using X-ray diffraction technique. Large changes in bulk modulus are observed at ferromagnetic to paramagnetic phase transition. The temperature dependence of bulk modulus shows normal behavior both in the ferromagnetic and in the paramagnetic phases of Fe–Ni Invar alloys but shows anomalous behavior in the ferromagnetic phases of Fe72Pt28 alloy. The different behaviors are discussed in connection with thermodynamical relation and the recent theoretical and experimental results.View full abstractDownload PDF (796K) -
Gendo Oomi, Nobuo Mori1981 Volume 50 Issue 9 Pages 2924-2930
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPressure effect on the spontaneous volume magnetostriction ωs of Fe–Ni and Fe–Pt Invar alloys is studied by measuring the pressure dependence of lattice constants usins X-ray diffraction technique. The pressure derivative of ωs and the magnetic contribution to the compressibility in Fe–Ni Invar alloy near 0 K are found to be largely different from those in Fe–Pt Invar alloy. The differences are interpreted phenomenologically in terms of the pressure dependence of Tc and M0 and suggested to relate with the stability of magnetic moment at low temperature.View full abstractDownload PDF (728K) -
Naoshi Suzuki1981 Volume 50 Issue 9 Pages 2931-2938
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic properties in the paramagnetic phase of pseudo-one-dimensional system RbFeCl3 are studied within a linear chain model on the basis of the Dynamical CEFA (Correlated-Effective-Field Approximation). The results of calculation, the magnetic susceptibility, the temperature and magnetic-field dependences of the magnon energy and the magnon dispersion, can well explain the experimental results. The gap energy D between the ground state and the excited doublet of the Fe2+ ion is conclusively estimated to be \gtrsim14.0 cm−1. The possibility of two-magnon Raman scattering is also predicted and the temperature dependences of the Raman line shape and the integrated intensity are calculated.View full abstractDownload PDF (908K) -
Hironobu Fujii, Yuzo Hashimoto, Tetsuhiko Okamoto, Norio Achiwa, Shinj ...1981 Volume 50 Issue 9 Pages 2939-2947
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSNeutron diffraction studies on a single crystal of Tb0.5Er0.5 alloy which had been considered to be a tilted helix structure from magnetization measurements, have been carried out at 4.2 K. It has been found that not only the fundamental satellites, but also the very weak 5th and 7th order harmonic satellites are observable at 4.2 K. From the analyses of the observed structure factors, the magnetic structure could be interpreted to be a homogeneous tilted helix with a tilt angle of 17° for both Tb and Er moments at 4.2 K. The appearance of the higher order satellites suggests a bunching state where the magnetic moments projected in the basal plane bunch about the easy directions. On the basis of the theory of Sherrington, the stability of tilted helical ordering in the ground state is briefly discussed.View full abstractDownload PDF (1100K) -
Yoshiko H. Ohashi, Misuzu Kaneko, Mitsuru Fukuchi, Kazutoshi Ohashi1981 Volume 50 Issue 9 Pages 2948-2954
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have studied the dynamical motion of an interstitial impurity atom at octahedral site in the fcc lattice and obtained the expression of the mean-square displacement of the defect. In order to make predictions of the effects of properties of the interstitial impurity atom upon the mean-square displacement, the displacement is calculated numerically. The results are applied to the case of hydrogen in the fcc crystal palladium.View full abstractDownload PDF (776K) -
Masao Yamamoto1981 Volume 50 Issue 9 Pages 2955-2960
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe dimensional resonance of helicon waves in thallium has been studied at 1.3 K in the magnetic field H applied along [0001]. From data of the fundamental resonance the carrier concentration is determined as 2.0×1022 cm−3, which is in good agreement with the value obtained from a dc measurement of the Hall effect. Considering the Fermi surface (FS) model of Holtham and Priestley, it follows that the major carrier in thallium is hole for H⁄⁄[0001], which fact is also confirmed by the dc measurement. The analysis of half-value widths of resonance peaks reveals that the magnetoresistivity saturates at the higher field region. This is consistent with the FS model demonstrating the absence of an open orbit just for H⁄⁄[0001].View full abstractDownload PDF (720K) -
Izumi Hirabayashi, Kazuo Morigaki, Shoji Nitta1981 Volume 50 Issue 9 Pages 2961-2968
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTime-resolved luminescence experiments have been carried out at low temperatures in hydrogenated amorphous silicon using a pulsed dye laser. The experimental results are discussed on the basis of model calculations which take into account radiative recombination of trapped electron-hole pairs and also nonradiative recombination at dangling bond centres. Fatigue effect in the luminescence has also been investigated by time-resolved measurements.View full abstractDownload PDF (1040K) -
Noritaka Kuroda, Yuichiro Nishina1981 Volume 50 Issue 9 Pages 2969-2977
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSpectroscopic ionicities have been evaluated for GaS, GaSe and InSe from experimental values of the dielectric constant in terms of the Penn-Phillips model. The transverse effective charge and the ratio of bond bending to stretching force constants have been compared with the spectroscopic ionicity. These isomorphic III–VI layer compounds are found to have characteristic values of ionicity which lie in the region intermediate between those of group III–V and II–VI compounds, showing that the nature of their valence bonds are quite similar to the tetrahedral bond in such cubic compounds. InS should have its ionicity comparable to that of GaSe and InSe if it crystallizes in the layer structure. A survey of experimental informations related to the phase transformation of III–VI compounds suggests that shear mode phonons play a particular role to determine the crystal energy of InS, leading to the instability of the layer structure.View full abstractDownload PDF (1148K) -
Tsuneya Ando1981 Volume 50 Issue 9 Pages 2978-2984
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEnergy Levels and conductivities are calculated in a GaAs–AlxGa1−xAs superlattice in magnetic fields applied normal to the superlattice direction. Effects of intersubband mixings are shown to be important and modify the level structure considerably especially in strong magnetic fields. The results are compared with recent experiments of Chang et al. and a reasonable agreement is obtained if an electron concentration slightly higher than that determined experimentally is assumed. Transport in a model system with weak interlayer couplings is also discussed.View full abstractDownload PDF (808K) -
Atsuko Sumi1981 Volume 50 Issue 9 Pages 2985-2995
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is predicted that the peak intensity in the absorption and luminescence spectra of free excitons should decrease with increasing thickness L of a thin crystal when the intensity in the tail region is fixed. This originates from the fact that the radiative decay of excitons, which is effective only in a narrow momentum region inversely proportional to L, has a maximum rate proportional to L at the momentum of free-exciton resonance. The line shape itself is rather insensitive to L. Optical spectra of self-trapped excitons do not depend on L. When the radiative decay effect is not negligible, even these first-order spectra must be obtained in the framework of the more general second-order optical processes. The Kramers-Kronig transformation from the reflectivity spectrum to the absorption one, and the oscillator-strength sum rule concerning the constancy of the integrated absorption break down.View full abstractDownload PDF (1316K) -
Yasusada Yamada1981 Volume 50 Issue 9 Pages 2996-3004
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe dynamics of a coupled system between phonons and proton tunneling mode are investimated. Concerning proton dynamics, the energy decay processes to the heat bath, as well as the coupling mechanism to a particular phonon mode, are taken into account in the generalized-Langevin equation describing the coupled system. An explicit expression of phonon spectral density distribution in the energy-momentum space is derived within RPA approximation. This expression seems to give an unified form which includes the various treatments hitherto discussed as its extreme cases. Particularly a continuous cross-over behavior from underdamped regime to the overdamped regime associated with proton tunneling mode is discussed using the obtained unified expression.View full abstractDownload PDF (1044K) -
Michio Midorikawa, Hidetoshi Kashida, Akikatsu Sawada, Yoshihiro Ishib ...1981 Volume 50 Issue 9 Pages 3005-3008
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt was found by means of dilatometric and dielectric measurements that 5PbO·2P2O5 crystal shows improper ferroelectricity below about 10°C. Pyroelectric charge appears along the b-axis of the monoclinic phase and is about 1.6 μC/cm2 just below the transition temperature. The P–T phase diagram of 5PbO·2P2O5 is also presented. The symmetry aspect of the transition to the improper ferroelectric phase is briefly discussed.View full abstractDownload PDF (388K) -
Masaharu Tokunaga1981 Volume 50 Issue 9 Pages 3009-3015
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt has been reported that the line shape of the broad central component observed in light scattering spectra in KD2PO4 depends upon the direction of scattering wave vector q near the transition temperature. The spectra in this system have been shown to be well described as those of a polarization relaxation mode-acoustic phonon coupled system with two special directions of q. By substituting experimental data for the parameters in this system, the temperature and q dependences of the spectra are numerically computed. The observed q dependence is well simulated by taking into account the anisotropic polarization fluctuations due to an electrostatic dipole-dipole interaction and an elastic long range force.View full abstractDownload PDF (684K) -
Akira Sakai, Itaru Tatsuzaki1981 Volume 50 Issue 9 Pages 3016-3022
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRaman scattering study of RbH3(SeO3)2 is carried out from 0 to 1000 cm−1 above and below the phase transition temperature Tc with special attention to the internal modes of selenite molecules. The internal vibrations are well assigned to internal modes of HSeO3− and H2SeO3 rather than those of SeO32− in the both of paraelectric and ferroelectric phases. It is shown that protons do not play an appreciable role in the phase transition mechanism. The splitting of the vibrational Raman band observed at about 20°C above Tc indicates the local formation of dynamical clusters having the character of low temperature phase induced by the precursor order above Tc.View full abstractDownload PDF (728K) -
Hideo Sakairi, Eiichi Yagi, Akio Koyama, Ryukiti R. Hasiguti1981 Volume 50 Issue 9 Pages 3023-3031
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe resistivity increase by charged particle irradiation at liquid helium temperature has been measured on ordered and disordered Cu3Au alloys. Comparison of the resistivity increase rate among these alloys and Cu is made for the same damage energy density. The number of disordering replacements per Frenkel pair in ordered Cu3Au is estimated to be 27. The Snyder-Neufeld integral equation on the damage function is solved under the condition including the effect of focusing replacements. By modification of the result a semiempirical damage function is obtained.View full abstractDownload PDF (1200K) -
Masaru Tsukada, Eizo Miyazaki, Hirohiko Adachi1981 Volume 50 Issue 9 Pages 3032-3039
Published: September 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe electronic structures of polar ZnO srufaces are investigated by the use of the DV–Xα cluster calculations. The compensating charge of about 18∼28% of inner ionic charge is found to be induced on the polar surface of the cluster. The electronic origin of the charge compensation is discussed in detail. Drastic reduction of the ionic charge is revealed on the corner of the clusters, which is caused by the crossing of the surface level with the Fermi energy. Chemisorptions of oxygen and hydrogen on the ZnO polar surface are also studied by the cluster model.View full abstractDownload PDF (996K) -
Kiyokazu Nakagawa, Koji Maeda, Shin Takeuchi1981 Volume 50 Issue 9 Pages 3040-3046
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn-situ observations by TEM reveal that dislocation velocity is not influenced by light illumination, indicating that the cause of the photoplastic effect (PPE) in II–VI compounds is not a change in the dislocation mobility. Densities of dislocations and loops left after plastic deformation in light are about an order of magnitude higher than those in darkness. These results together with the results of mechanical tests and those given in Part I (J. Phys. Soc. Jpn. 49 (1980) 1909) lead to a conclusion that the PPE is caused by the decrease in mean free path of multiplied dislocations. Jog formation by cross slip resulting in immobilization of glide dislocations is considered to be enhanced by their interaction with charged point defects that trap minority carriers generated by illumination.View full abstractDownload PDF (1232K) -
Shin-ichi Kondo, Hiroaki Matsumoto1981 Volume 50 Issue 9 Pages 3047-3053
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ordinary and the extraordinary refractive indices of CdI2, CdBr2 and CdCl2 single crystals have been measured at room and liquid nitrogen temperatures in the region from 7000 A to the shorter wavelength up to the absorption edge. The measurements have been carried out by an interference method in which both indices can be determined together with the thickness of the sample crystal. The results show birefringent optical characteristics or the negative crystal. The characteristics are interpreted in terms of dichroic absorption. The dispersion behavior of the indices in the energy region well below the absorption edge is analyzed using a single-effective-oscillator model.View full abstractDownload PDF (948K) -
Takeo Takizawa1981 Volume 50 Issue 9 Pages 3054-3062
Published: September 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDifferential reflectivities of paratellurite, TeO2, which has a large optical rotatory power are measured in the spectral range from 220 to 350 nm at 300 K, using a polarization modulation technique. The measurement is made under nearly normal incidence using a reflection surface normal to the c-axis. The data are analyzed in terms of two different formalisms for optical activity; one using the gyration tensor appearing in the expansion of the dielectric function in powers of wave vector and the other based on the Condon’s formalism. The experimental spectrum agrees fairly well with the result by the latter formalism, leading to the conclusion that the optical activity of TeO2 does not affect the reflection spectrum under the normal incidence condition.View full abstractDownload PDF (1076K)