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Volume 53, Issue 10
Displaying 1-50 of 65 articles from this issue
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Kazuaki Narita1984 Volume 53 Issue 10 Pages 3277-3279
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt is demonstrated that the semi-discrete Sine-Gordon equation exhibits discontinuous soliton solutions. Three types of new solutions are presented and subjected to examination.View full abstractDownload PDF (288K) -
Hidetoshi Miike, Yasuo Kuriyama, Hajime Hashimoto, Yoshio Ebina1984 Volume 53 Issue 10 Pages 3280-3283
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe electrohydrodynamic instability in nematic liquid crystal is investigated by laser light scattering method. The power spectrum of a scattered intensity of light from the liquid crystal cell under ac field is analysed. The forced director fluctuation is observed above a threshold voltage. It is clarified that the director fluctuation is influenced by an onset and a development of the convective flow.View full abstractDownload PDF (452K) -
Akira Hirose, Katuro Sawada, Shoichi Miyoshi1984 Volume 53 Issue 10 Pages 3284-3285
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAxially nonuniform plasma rotation, as expected in tandem mirrors, is shown to be unstable against ion acounstic modes. Although both convective and absolute instabilities exist the former may not be dangerous to plasma confinement, and the latter seems to be strongly dependent on actual confinement configuration.View full abstractDownload PDF (228K) -
Hikaru Terauchi, Yasuo Nishihata, Hironobu Maeda, Moritaka Hida, Nagao ...1984 Volume 53 Issue 10 Pages 3286-3289
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe measurement of the EXAFS spectrum of superionic Cu1.8Se has been carefully carried out. The local structures around the Cu and Se atoms are determined. The Cu atoms around the tetrahedral site of Se atoms are detected but those around the octahedral site are not found. The XANES spectrum of Cu1.8Se was also measured and compared with that of Cu2Se.View full abstractDownload PDF (316K) -
Takao Kino, Kaoru Mizuno1984 Volume 53 Issue 10 Pages 3290-3292
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSVacancy generation process in nearly perfect aluminum single crystals was investigated by X-ray diffraction topography technique of Lang. A lot of small black dots were observed in the topograph taken after the temperature rise from room temperature to 200°C, and these dots are confirmed to be small interstitial type dislocation loops. It was concluded that the thermal generation process of vacancies in nearly perfect crystals consists of the following two steps. Small interstitial clusters are formed in the perfect lattice first, and then these grow to interstitial type dislocation loops emitting vacancies into lattice.View full abstractDownload PDF (608K) -
Masanori Aoki, Yoshinori Tabata1984 Volume 53 Issue 10 Pages 3293-3294
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe energy and the frequency of a localized mode oscillation which is excited by a soliton are investigated in the Toda lattice. The oscillations of frequencies 2ωc, 2.5ωc and 3ωc are enhanced, where ωc denotes the cut-off frequency of the uniform lattice.View full abstractDownload PDF (208K) -
Kokichi Oshima, Mitsuru Suzuki, Koichi Kikuchi, Haruo Kuroda, Isao Ike ...1984 Volume 53 Issue 10 Pages 3295-3298
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSHigh field magnetoresistivity in (TMTSF)2ClO4 was measured down to 0.52 K and up to 13 T. Magnetoconductivity tensor components are derived assuming two-dimensional anisotropy. It is confirmed that some part of previously reported oscillations which have been attributed to the Shubnikov-de Haas effect should be regarded as discontinuous changes of magnetoresistance caused by the stepwise decrease in the effective carrier density due to successive phase transitions. This conclusion is supported by the field dependence of the longitudinal magnetoresistivity component (ρzz). The sign of the Hall coefficient is negative at high field.View full abstractDownload PDF (524K) -
Hidetoshi Fukuyama1984 Volume 53 Issue 10 Pages 3299-3302
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSControversy over the inelastic scattering time, τε, in the weakly localized regime in two-dimension has been resolved. The strong spin-orbit scattering is shown not to affect τε.View full abstractDownload PDF (324K) -
Bunjyu Shinozaki, Takasi Kawaguti, Yasunobu Fujimori1984 Volume 53 Issue 10 Pages 3303-3306
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature and magnetic field dependence of the electrical conductance σ in thin granular-aluminum films has been measured in the temperature range 4.2–35 K above the superconducting transition temperature. The temperature dependence of conductance σ in zero magnetic field has been compared with a theory including the higher order contribution of the interaction, by evaluating the localization term from the analyses of the magnetoconductance. The σ in zero field agrees with the theory in a temperature of minimum conductance and in the temperature dependence at high temperatures, with a reasonable value of the average matrix element of the Coulomb interaction.View full abstractDownload PDF (484K) -
Yukimichi Tajima, Kazuhiko Yamaya1984 Volume 53 Issue 10 Pages 3307-3310
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFrom measurements of the magnetic and electric field dependence of a giant resistivity anomaly (GRA) which was observed within the superconducting (SC) transition region of TaSe3, it was found that the behavior of the GRA under the magnetic field was accompanied by the anisotropy of the SC critical magnetic field, Hc2, and there was the threshold electric field in the nonlinear conductivity in the GRA state. It is concluded that the GRA is one aspect of the SC phenomena. Furthermore, it is suggested that the mechanism of the GRA is related with the impurity pinning in the SC state.View full abstractDownload PDF (464K) -
Takao Suzuki, Takafumi Tsuboi, Hideo Takaki1984 Volume 53 Issue 10 Pages 3311-3314
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe first order transition of superconductivity was confirmed in the vicinity of the spin paramagnetic limit for thin Al films with a thickness less than 60 Å by observing the hysteresis in the resistive transition around 4 T and below 0.6 K.
In the reentrant superconducting state for films thicker than 60 Å, tunneling characteristics of Al-Oxide-Ag junctions under high magnetic fields were found to have higher conductances at low bias voltages than those in the normal state. This supports Fulde’s prediction that the reentrant superconducting state has a higher entropy than the normal state.View full abstractDownload PDF (556K) -
Koichi Katsumata, Mitsuho Tanimoto, Setsuo Mitsuda, Yasuo Endoh1984 Volume 53 Issue 10 Pages 3315-3318
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn ac susceptibility measurement and a polarized neutron experiment have been performed on the random mixture, Rb2Mn(1−x)CrxCl4 of an insulating ferromagnet Rb2CrCl4 and an insulating antiferromagnet Rb2MnCl4. The susceptibility of the mixed crystals rich in Cr atoms increases sharply at the Curie Temperature and then shows a drop-off at a lower temperature, indicating a double transition. The polarization of the neutron beam transmitted through the sample exhibits drastic changes at the two transition temperatures. The experimental results are interpreted by models recently proposed to explain re-entrant spin-glass transition.View full abstractDownload PDF (556K) -
Mitsuo Wada, Akikatsu Sawada, Yoshihiro Ishibashi1984 Volume 53 Issue 10 Pages 3319-3320
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependences or the soft TO mode and the associated LO mode in Li2Ge7O15 have been measured by Raman scattering technique in the ferroelectric phase. The frequency of the LO mode decreases as Tc is approached from below. The LO–TO splitting of the soft mode was observed to be smaller than 1 cm−1. The results are discussed in the relationship with those obtained through measurements of dielectric constant. The oscillator strength for the polar soft mode in the paraelectric phase is expected to be very small.View full abstractDownload PDF (236K) -
Masae Takahashi, Takashi Takahashi, Kentaro Murano, Haru Ogawa, Fumio ...1984 Volume 53 Issue 10 Pages 3321-3323
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSX-ray photoelectron spectroscopy has been applied for 13-(trifluoromethyl)-bacteriorhodopsin in order to study the electrostatic environment of retinylidene moiety in bacteriorhodopsin. It has been found that the F ls binding energy of the pigment is about 3.4 eV smaller than that of free 13-(trifluoromethyl)retinal. This is the first and direct experimental detection of an external negative charge characterizing the optical properties of bacteriorhodopsin. The numerical interpretation of the chemical shift suggests that the negative charge is situated about 3 Å distant from the C13-methyl group of a retinal molecule.View full abstractDownload PDF (380K) -
Shinsuke Watanabe, Nobuo Yajima1984 Volume 53 Issue 10 Pages 3325-3334
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe propagation of a soliton in an inhomogeneous medium is investigated numerically by the following K-dV type equation;
ut+6uux+uxxx+c(t)u=0.
The inhomogeneous coefficient c(t) is assumed to be zero except for the period, 0≤t≤T. When the integral of c(t) from t=0 to t=T is negative, a soliton grows and generates small solitons. In the case where the integral is positive, a soliton diminishes and does not produce new soliton. In either case, the solution depends on the ratio of the distance that an initial soliton is propagated in the period 0≤t≤T to the width of the soliton.View full abstractDownload PDF (876K) -
Yutaka Toyozawa1984 Volume 53 Issue 10 Pages 3335-3341
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn argument is presented that the consistent description of the evolution of a system is possible only with the statistical operator and not with the wave function. A reconstruction of the logic of quantum mechanics is proposed with the statistical operator as the basic quantity to describe the state in one-to-one correspondence. The problem of measurement is reconsidered in the light of this new logic. It is shown for the first time how the irreversible change in the measuring apparatus leads to the truncation of von Neumann’s chain between the object and the subject.View full abstractDownload PDF (924K) -
Miki Wadati, Yasuhiro Akutsu1984 Volume 53 Issue 10 Pages 3342-3350
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIntroducing the Korteweg-de Vries equation with a damping term and an external force, the behaviors of solitons under the Gaussian white noise is studied. In the non-damping case, a height and a width of the soliton are proportional to t−3⁄2 and t3⁄2 respectively, for large t. The asymptotic form of the multi-soliton is also discussed. In the damping case, it is found that a width of the soliton is much narrow while a height is much small as compared with the non-damping case. A new idea for the analysis of inhomogeneous soliton equation is suggested.View full abstractDownload PDF (748K) -
Shigeru Nakayama1984 Volume 53 Issue 10 Pages 3351-3361
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTheoretical analysis of D1 lines of most stable alkali atoms in velocity selective optical pumping (VSOP) spectroscopy is presented by using the approximation of a single cycle of optical pumping in a four-level system. VSOP spectroscopy is clearly compared with polarization spectroscopy and then it is shown that the results obtained for polarization spectroscopy can be applied to the theory in VSOP spectroscopy. The relative signal intensities of Na D1 line in polarization spectroscopy have been theoretically calculated and experimentally confirmed to be in good agreement with those in VSOP spectroscopy. The first-order theory in VSOP spectroscopy can be applied to the cases of the D1 lines of the other alkali atoms. It is expected that the theoretical analysis can be useful for future experiments of the Doppler-free D lines in the alkali atoms.View full abstractDownload PDF (964K) -
Takashi Wada1984 Volume 53 Issue 10 Pages 3362-3371
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe rotational transitions in low energy collisions between two polar molecules are studied by two semiclassical methods. One method is the impact-parameter close-coupling (IPCC) method which is applied to the relatively high energy collisions. For the lower energy collisions, the perturbed rotational state (PRS) method is adopted within the framework of the semiclassical impact-parameter method. The intermolecular potential is approximated by the long range dipole-dipole interaction. By using these two approaches, rotational cross sections are evaluated over a wide velocity range for the first time. A scaling procedure is introduced to enable us to evaluate the cross sections for a wide variety of polarmolecule pairs which are not necessarily identical. The validity of the sudden approximation is also studied.View full abstractDownload PDF (1148K) -
Kenji Kimura, Michihiko Mannami1984 Volume 53 Issue 10 Pages 3372-3377
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBackscattered yield of H2+ ions was measured for scattered angles less than 2.00 when 500–700 keV H2+ ions impinge on a polycrystalline Au target with an incident angle 0.5°. The observed yield was well interpreted by the recombination of diprotons leaving the target surface.View full abstractDownload PDF (640K) -
Osamu Inoue, Shun-itsu Sato, Hakuro Oguchi1984 Volume 53 Issue 10 Pages 3378-3384
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSStructures of turbulent mixing layers, especially of large-eddies, are investigated by visual observation by means of a smoke-wire method. Mixing layers are produced by a screen set perpendicular to freestream in a test section. Flow features of the mixing layers are observed by means of motion pictures taken with a 16 mm high-speed camera. Results show that 1) large-eddies form from the amplification of unstable small-amplitude waves, 2) vortex pairing process as well as the growth of large-eddies without vortex pairing, found by Hernan & Jimenez, play an important role in the growth of the turbulent mixing layer, and 3) the mixing layers are fundamentally two-dimensional.View full abstractDownload PDF (772K) -
Shin-ichiro Yanase, Kiyoshi Kohno1984 Volume 53 Issue 10 Pages 3385-3394
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe stability of double circular arrays of vortices is investigated where each array consists of N point vortices of equal strength. The permanent configurations of the arrays are found to need the vortices of different strength on a different array depending on the distance between the arrays. The linear stability of the configurations is investigated for several values of N, and it is found that the configuration is stable for N=2 and 3 and there exist almost stable arrangements for N=4, 5 and 6. The nonlinear stability of the vortex configurations is numerically studied, and it is found that linearly stable configurations are stable against finite amplitude disturbances and the almost linearly stable configurations are also stable for small amplitude disturbances.View full abstractDownload PDF (964K) -
Kanefusa Gotoh, Michio Yamada1984 Volume 53 Issue 10 Pages 3395-3398
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe theory of the instability of parallel periodic flows is extended to the two-dimensional cellular flows. The eigenvalue equation is derived to find the critical Reynolds number to the disturbance with small Floquet exponents. The theory is applied to the cellular flow: U=(−sin y, sin x) and the critical Reynolds number is found to be \sqrt2.View full abstractDownload PDF (396K) -
Masahiko Nakamura, Teruji Cho, Shin Kubo, Takashi Shimozuma, Akira And ...1984 Volume 53 Issue 10 Pages 3399-3407
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWhen RF power PLHH near the lower hybrid frequency is injected into the ohmically heated plasma in the WT-2 tokamak, the RF-driven current is generated (Irf\simeq12 kA) and the plasma (ne\simeq3×1012 cm−3) is sustained by this current without ohmic current during the injection of PLHH. The efficiency of RF current drive is obtained as Irf=0.06PLHH⁄ne·R (kA, kW, 1013 cm−3, m), where R is the major radius. The current Irf is carried by suprathermal electrons which interact resonantly with lower hybrid waves. A high frequency instability and associated relaxation oscillation are observed, which can be suppressed by a simultaneous injection of the electron cyclotron heating power.View full abstractDownload PDF (1220K) -
Yasutomo Ohguchi, Takenori Kaneko1984 Volume 53 Issue 10 Pages 3408-3415
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFor 0.1–10 A discharges, transition phenomena as a property of positive column are studied through examination of the results of the present experiment, of preceding experiments, and of the theories by the authors. They are caused by the dissociation peak of thermal conductivity of hydrogen gas. If a series resistance of a power supply is fairly small, state of plasma jumps from an arc to a glow with decrease of a discharge current. When the series resistance becomes considerably larger, an oscillation appears in a state transition region. The phenomena do not depend on materials and surface conditions of cathode. The dependence of the transitions on a tube radius and on a resistance of a power supply agree qualitatively with the theories.View full abstractDownload PDF (992K) -
Shigeo Kawata, Keishiro Niu1984 Volume 53 Issue 10 Pages 3416-3426
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of the nonuniform implosion of the ICF target on the fusion parameters is investigated numerically. The numerical analysis is carried out by using a three-dimensional particle in cell code with sliding grids. The numerical results show that the nonuniformity of the implosion acceleration is required to be less than a few percent for a pellet of reactor size.View full abstractDownload PDF (884K) -
Yoshiomi Kondoh, Tsuneo Amano, Akiyoshi Nagata, Kiyoshi Ogawa, Yoshiki ...1984 Volume 53 Issue 10 Pages 3427-3437
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn energy principle is formulated for construction of toroidal equilibria in partially relaxed minimum energy states. It is shown that additional global constraint yields an additional condition on the force-free current term of the MHD equilibrium equation. It is clarified that the partially relaxed state model (PRSM) for toroidal plasmas, such as the tokamak plasma and the reversed-field-pinch plasma (RFP plasma), represents the minimum-energy states with finite β-values under global invariants. Comparisons of numerical results by the PRSM for the RFP plasma with two typical experimental data indicate that RFP configurations close to the PRSM are realized in the two RFP experiments. The most advanced partially relaxed state with finite β-values is also discussed.View full abstractDownload PDF (1452K) -
Yasuji Kashiwase, Yoshiro Kainuma1984 Volume 53 Issue 10 Pages 3438-3446
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSStrong excess lines were observed across the 111 diffuse spots of CuKα and CuKβ radiations in the Bragg arrangement and across the 220 diffuse spot of CuKα radiation in the Laue arrangement on photographs of germanium crystals taken by using unfiltered radiation from copper target operated at accelerating voltage 30 kV.
Crystal orientation dependence of the excess line and intensity variation of the excess line similar to that of thermal diffuse scattering with change in specimen temperature strongly suggest that the excess line is caused by anomalous transmission of the thermally scattered characteristic X-rays in the perfect crystal.View full abstractDownload PDF (2044K) -
Shin’ichi Takeda, Shigeru Tamaki, Yoshio Waseda1984 Volume 53 Issue 10 Pages 3447-3456
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe neutron diffraction study of liquid Bi–Sn alloys has been carried out to reveal their characteristic structure. The low lying shoulder on the high angle side of the first peak in the structure factor can be observed for all alloy compositions presently investigated. This shoulder could be attributable to a ledge-type pair potential in the system, of which origin has also been discussed.View full abstractDownload PDF (784K) -
Yoshinori Takeuchi1984 Volume 53 Issue 10 Pages 3457-3465
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the ultrasonic velocity of TGSe–DTSe mixed crystals was measured near the two tricritical lines. It was found that there is a remarkable difference between the behavior of the anomalous parts of the sound velocity near the two tricritical lines, while there is no qualitative difference in the dielectric property.View full abstractDownload PDF (960K) -
Yoshihiro Ishibashi, Ikuo Suzuki1984 Volume 53 Issue 10 Pages 3466-3475
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPhase diagrams in the applied electric field vs the temperature plane were studied for several cases of improper ferroelectric and ferroelastic transitions. An interesting phase diagram including a re-entrant phase and a tricritical point is obtained when the system undergoes the ferroelastic-ferroelectric transition in the absence of the electric field. The anomalies in the temperature dependence of transition parameters, the electric susceptibility and the elastic stiffness constant are discussed. The nature of transitions is examined from the viewpoint of the Clausius-Clapeyron and the Ehrenfest relations.View full abstractDownload PDF (896K) -
Shigeo Ihara, Katsuo Suzuki1984 Volume 53 Issue 10 Pages 3476-3480
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe correlated diffusive motion of particles induced by a randomly migrating vacancy in the tetrahedral or octahedral interstitial sites in bcc lattice, which each form non-Bravais lattice is studied within the encounter model using Monte Carlo simulation techniques. It is found that the tracer correlation factor for each case is in good agreement with the results obtained by Koiwa and Ishioka using the Green function approach.View full abstractDownload PDF (620K) -
Yasuo Endoh, Kenji Kawaguchi, Nobuyoshi Hosoito, Teruya Shinjo, Toshio ...1984 Volume 53 Issue 10 Pages 3481-3487
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA structure analysis was made for Fe–V artificial superstructure films by X-ray diffraction. The experiments demonstrated successful growing of coherent Fe–V multilayers of the [110] texture. The diffraction patterns are interpreted by a simple step model, which implies that a large mismatch of d spacings of a bcc lattice between Fe and V is compensated by coherency strains. The average d spacing of the bcc lattice changes with the composition of the films.View full abstractDownload PDF (792K) -
Hiroshi Daimon, Hisaji Ito, Shik Shin, Yoshitada Murata1984 Volume 53 Issue 10 Pages 3488-3497
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPolar-angle-dependent photoelectron diffraction (PPD) of the S 2p core photoemission from Ni(001)c(2×2)-S has been measured by using synchrotron radiation at photon energies of 228 and 250 eV and along the [10] and [11] azimuths. The diffraction pattern has been calculated with a single scattering cluster model. A simple equation for photoelectron diffraction using the atomic scattering factor for a spherical incident wave has been derived for the calculation. The calculated PPD pattern using structure parameters obtained by LEED has been in good agreement with the observed PPD data.View full abstractDownload PDF (1072K) -
Hitoshi Sumi1984 Volume 53 Issue 10 Pages 3498-3511
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe rate of self-trapping (ST) is calculated, considering that ST begins with quantum-mechanical tunneling of a free exciton to a state of nucleation less localized than the relaxed self-trapped one. Three cases appear depending on the site-diagonal and off-diagonal exciton-phonon interaction energies S1 and S2 relative to the half width B of the exciton band. When S2⁄B\gtrsim0.21, ST through the nucleation state of two-center type predominates. When S2⁄B\lesssim0.21 and S1⁄B\lesssim1.25, only ST through that of one-center type occurs. When S2⁄B\lesssim0.21 but S1⁄B\gtrsim1.25, the latter channel predominates at low temperatures but it is over-come by the former one with increasing temperature. Alkali halides except iodides are classified into the first case, RbI into the second one, and KI into the third one. The so called Ex luminescence observed only in alkali iodides should be emitted from a still unknown self-trapped state of one-center type.View full abstractDownload PDF (1896K) -
Hitoshi Sumi1984 Volume 53 Issue 10 Pages 3512-3519
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe barrier height EB for self-trapping (ST) has been evaluated so far by analyzing the data on thermal quenching of free-exciton luminescence with the use of the classical formula (∝ exp [−EB⁄kBT]) of the ST rate even at temperature T considerably lower than the Debye one. The rate of multiphonon nonradiative transition such as the ST rate cannot be described by the classical formula at such low temperatures. Analysis of the data of RbI below 30 K with the quantum mechanical formula gives EB\simeq38–39 meV much larger than 17–18 meV obtained so far. The analysis shows simultaneously that concerning n=1 free excitons ST into a state of one-center type determines the rate in RbI while in KI it is overcome by ST into a state of two-center type with increasing temperature. This enables us to predict that the so called Ex luminescence should be emitted from a still unknown self-trapped state of one-center type.View full abstractDownload PDF (1068K) -
Hiroyuki Ito, Akira Terai, Yoshiyuki Ono, Yasushi Wada1984 Volume 53 Issue 10 Pages 3520-3531
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe eigenvalue problem for linear modes around a single soliton in the model of Takayama, Lin-Liu and Maki (a continuum version of the Su-Schrieffer-Heeger model for trans-(CH)x) is numerically solved. Three localized modes are found. The phase shift analysis of extended phonons yields consistent results with the existence of the three localized modes and further shows that the effective potential for the extended phonons, arising due to the presence of the soliton, is reflection-less. The results obtained here can be used in the calculation of the diffusion constant of the solitons in trans-(CH)x.View full abstractDownload PDF (1480K) -
Sumiaki Nagai1984 Volume 53 Issue 10 Pages 3532-3539
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of an external magnetic field on the resistivity of dilute magnetic alloys is investigated with the use of the Green’s functions. The equation of motion for the Zubarev Green’s functions with an external magnetic field included is solved correctly up to order J3 and to all orders in V, where J is the exchange integral and V the spin-independent potential. The effect of the external magnetic field is involved in the Zeeman term of logarithmic terms and in Fσ(ω) which shows the effect of freezing out of spin-flip scattering. The effect of the spin-independent potential is involved in the modified density of states \ ildeρ and in a phase δv of the t matrix.
The magnetoresistance obtained from numerical calculation shows a variety of patterns which are classified by the sign of J\ ildeρ and the value of the phase shift δv.View full abstractDownload PDF (772K) -
Arisato Kawabata1984 Volume 53 Issue 10 Pages 3540-3544
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWeak localization theory of magnetoresistance in two-dimensional systems is re-investigated. A formulation is developed which is applicable up to magnetic field much larger than the exsisting theory. The result of the calculation is compared with the experiment on GaAs/AlGaAs heterojunction and the agreement between them is satisfactory.View full abstractDownload PDF (500K) -
Kôki Ikeda, Yôichi Araki, Kazuo Tanosaki1984 Volume 53 Issue 10 Pages 3545-3552
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe electrical resistivity of the Ni–Mn alloys containing up to 29.2 at%Mn was measured from 4.2 to 1000 K. With increasing Mn contents, the magnetic resistivity at T≥Tc in the disordered Ni–Mn alloys linearly increases, reaches a maximum around 7 at%Mn and decreases. This behavior is interpreted by the spin-disorder mechanism with consideration of the composition variations of not only the de Gennes factor but also the average exchange-interaction constant.View full abstractDownload PDF (940K) -
Yoshiyuki Maeda, Hiroyuki Taki, Makoto Sakata, Eiji Ohta, Shoji Yamada ...1984 Volume 53 Issue 10 Pages 3553-3559
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe transverse magnetophonon resonance in high purity epitaxial n-InP was investigated at temperatures between 123 and 270 K. High pulsed magnetic fields up to 40 T were applied to observe the fundamental resonance field. The temperature dependence of the magnetophonon effective mass m0* at the bandedge was precisely determined through the analysis of the resonant field positions including the peak for N=1. The determined value of m0* is 0.079m0 at 270 K and 0.084m0 at 143 K. The magnetic field dependence of the damping factor was found to be \ ildeγ∝B2⁄3 in magnetic fields higher than 10 T. The temperature dependence of the damping factor was also obtained.View full abstractDownload PDF (812K) -
Hidetoshi Fukuyama, Hiromichi Ebisawa, Sadamichi Maekawa1984 Volume 53 Issue 10 Pages 3560-3567
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe critical temperature, Tc, and the upper critical field, Hc2, have been examined for three-dimensional superconductors in the weakly localized regime. The life time, τ, is assumed to be short enough such that τ−1>>ωD; ωD being the Debye frequency. The results indicate that there exists an appreciable suppression of Tc even in the weakly localized regime. The effect of strong spin-orbit scattering is also investigated and the suppression of Tc is seen not to be affected.View full abstractDownload PDF (756K) -
Fusayoshi J. Ohkawa1984 Volume 53 Issue 10 Pages 3568-3576
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe mutual interaction between f electrons by one-phonon exchange is investigated with a simplified model including the characteristic feature of valence fluctuating compounds; the local dilation of lattice couples with the local density of f electrons. When an angle made by f site-ligand (or f site)-f site is smaller than π⁄2, one-phonon exchange results in an attractive interaction between neighboring f electrons. The following cases are typical examples where an attractive interaction can exist; a pair of f electrons at the next nearest neighbor sitesin the bcc lattice and a pair at the nearest neighbor sites in the fcc lattece. The proposed mechanism of attractive interaction is consistent with the observations that CeCu2Si2 and UBe13 are superconductors, while CeAl3 and CeCu6 are not.View full abstractDownload PDF (1060K) -
Fusayoshi J. Ohkawa1984 Volume 53 Issue 10 Pages 3577-3586
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOn the basis of the Fermi liquid description of the normal state, singlet (s-symmetry) superconductivity in the Kondo lattice is examined near its transition temperature. For the criterion of superconductivity, a focus is given on the competition between the pair weakening force due to the spin fluctuation and the attractive interaction between neighboring f electrons. This competition explains that α-Ce is a normal Fermi liquid under ambient pressures, while it becomes superconducting under high pressures. It is also argued that singlet superconductivity is likely to be realized in CeCu2Si2 from the pressure dependence of the transition temperature, or the dependence of the transition temperature on the Kondo temperature.View full abstractDownload PDF (1104K) -
Makoto Isoda1984 Volume 53 Issue 10 Pages 3587-3598
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFrom the general considerations, the coexistence of ferro- and antiferromagnetism is discussed in uniaxially anisotropic itinerant electron systems. Especially in an easy-axis type anisotropic system, it is pointed out that the coexistent states and the phase transitions are significantly different from those in an isotropic system: (i) The following two canted states realize in addition to a ferrimagnetic state. The magnetization vectors cant symmetrically with respect to the easy axis in one state and to the hard plane in another state. (ii) Both ferrimagnetic and canted states can be realized successively in an anisotropic system.
The conditions for the coexistence and the phase diagrams in χQ−1−χ0−1 and H-T planes are discussed.View full abstractDownload PDF (1080K) -
Toshiro Sakakibara, Muneyuki Date1984 Volume 53 Issue 10 Pages 3599-3606
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSHigh field magnetizations of europium graphite intercalation compound C6Eu have been measured and a clear metamagnetic plateau with 1/3 of the full moment is observed at 4.2 K. Analysis of the magnetization process has revealed the existence of weak four-spin exchange interactions in addition to the usual two-spin exchange. This is the first clear evidence of the four-spin exchange coupling in the Ruderman-Kittel-Kasuya-Yosida (RKKY) type interaction system.View full abstractDownload PDF (932K) -
Toshiro Sakakibara1984 Volume 53 Issue 10 Pages 3607-3610
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPossible spin structures of the hcp-like triangular antiferromagnet are examined and the phase diagram is given. It is found that the well known triangular spin structure is unstable against an infinitesimal inter-layer exchange coupling, and two kinds of incommensurate structures appear according to the sign of the intra-layer next nearest neighbor exchange interaction.View full abstractDownload PDF (420K) -
Kazuyoshi Yoshimura, Yoji Nakamura1984 Volume 53 Issue 10 Pages 3611-3615
Published: October 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe 55Mn zero-field NMR spectra and their field dependence of the light rare earth RMn2 compounds have been measured at 4.2 K. The results indicate antiferromagnetism of these compounds. The values of Mn moments estimated from the center resonance frequency of the quadrupole splitting are 2.3 μB for SmMn2, 3.0 μB for NdMn2 and 3.2 μB for PrMn2.View full abstractDownload PDF (544K) -
Kiichi Okuda, Hiroshi Mollymoto, Yoshihito Miyako, Masahiro Mori, Mune ...1984 Volume 53 Issue 10 Pages 3616-3623
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic properties of a copper hexanitro compound Rb2PbCu(NO2)6 were investigated by means of magnetic susceptibility, specific heat, high field magnetization and electron spin resonance. The results show that the compound is a one-dimensional antiferromagnet with the main exchange interaction J⁄k of −2.5±0.2 K along the c-axis. A broad peak in the magnetic susceptibility and specific heat is found around 3 K while the Néel temperature is 0.59±0.005 K. The easy-plane type anisotropy is found in the c-plane and the spin contraction effect is found in accord with the theoretical expectation.View full abstractDownload PDF (800K) -
Mitsuo Kataoka, Osamu Nakanishi, Akira Yanase, Junjiro Kanamori1984 Volume 53 Issue 10 Pages 3624-3633
Published: October 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe bilinear term of the spin-polarization density in the spin-dependent energy of metals is separated into the terms of the symmetric spin interaction (SSI) and of the antisymmetric spin interaction (ASI), whose properties are first investigated phenomenologically. A microscopic derivation of the SSI and ASI is given for a metal which has no inversion center. It is shown that the spin-orbit coupling which splits electronic bands in the absence of inversion center produces an antisymmetric component of the wave-vector-dependent susceptibility and the ASI is proportional to the antisymmetric component to the first order of the latter quantity. The obtained ASI energy is concluded to be not always small compared with the SSI energy.View full abstractDownload PDF (1088K)