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Volume 55, Issue 7
Displaying 1-50 of 55 articles from this issue
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Masakazu Ichiyanagi1986 Volume 55 Issue 7 Pages 2093-2094
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new variation principle is proposed for nonequilibrium statistical mechanics, which is valid beyond the region of linear response. We have found that the generalization of the evolution criterion established by Glansdorff and Prigogine can be deduced from the present variation principle.View full abstractDownload PDF (240K) -
Hikaru Kawamura1986 Volume 55 Issue 7 Pages 2095-2098
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPhase transition of the frustrated XY (plane rotator) antiferromagnet on the three-dimensional layered-triangular lattice is studied with use of a symmetry argument and a Monte Carlo simulation. A second-order transition of a new universality class is found with the exponents α\simeq0.44, β\simeq0.22, γ\simeq1.1 and ν\simeq0.52. Certain types of canted or helical magnets are predicted to belong to the same universality class.View full abstractDownload PDF (528K) -
Yoshihiro Ishibashi1986 Volume 55 Issue 7 Pages 2099-2101
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe continuum approximation of the Temkin model of solid-melt interface is analyzed. The functional form of the activation energy depending upon the adopted parameter, which governs thickness of interface, is discussed.View full abstractDownload PDF (244K) -
Shigemasa Suga, Kazuo Soda, Tamiko Mori, Masaki Yamamoto, Koichi Kitaz ...1986 Volume 55 Issue 7 Pages 2102-2105
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPhotoemission spectra have been measured on clean surfaces of Cu1.8Mo6S7.6 single crystals with use of synchrotron radiation. Three structures are resolved at EB(binding energy from the Fermi level)=0.3∼0.4, 1.1 and 2.9 eV. The structures at EB=1.1 and 0.3∼0.4 eV have shown remarkable resonance effect above the Mo 4p core excitation threshold and are assigned to the Mo 4d states. On the other hand, the structure at EB=2.9 eV has revealed an appreciable resonance effect around the Cu 3p core excitation region, which suggests that it is due to Cu 3d states. The absence of this type of resonance for the structures at EB=1.1 and 0.4 eV shows that the hybridization of Cu 3d states is negligible in small EB region. Besides, the states around EB=5 eV are dominated by the S 3p states with a noticeable hybridization with the Mo 4d and Cu 3d states.View full abstractDownload PDF (564K) -
Masayuki Ido, Yoshitoshi Okajima, Migaku Oda1986 Volume 55 Issue 7 Pages 2106-2109
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSVoltage oscillations under repetitive pulsed fields were measured in the non-ohmic regime of NbSe3 below 58 K. Crystals used exhibit a narrow-band noise with only one fundamental component under a dc bias. The number of oscillations observed within the pulse width is always integral regardless of the pulse width, and it increases by one whenever the pulse width is increased by a constant value. This phenomenon, which appears to contradict with causality, is considered to be ascribed to some kinds of memory effect in metastable states of charge-density waves.View full abstractDownload PDF (436K) -
Hidetoshi Konno1986 Volume 55 Issue 7 Pages 2110-2113
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temporal intermittency of voltage of the classical one-component model for a charge-density wave system under the influences of dc electric field and noise is studied by numerical method. We show (1) how the intermittency of voltage corresponds to the profile of power spectrum, (2) how is the simulated voltage jumps in comparison with the observed ones in TaS3 and K0.3MoO3. It is also shown that the appearance of voltage jumps in the single-mass model enhanced by Gaussian white noise is subjected to a non-Markovian stochastic process.View full abstractDownload PDF (492K) -
Norio Kawakami, Ayao Okiji1986 Volume 55 Issue 7 Pages 2114-2117
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe temperature-dependent magnetoresistance of the heavy-electron Ce compounds is calculated with the use of the periodic Anderson model. It is pointed out that the magnetoresistance has a minimum-structure and may change its sign from negative to positive as the temperature is decreased. The obtained results are qualitatively in good agreement with the experimental evidences of CeAl3 and CeCu6.View full abstractDownload PDF (520K) -
Hidetoshi Fukuyama1986 Volume 55 Issue 7 Pages 2118-2120
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSQuantum corrections to conductivity due to a paramagnetic impurity are examined for interacting electrons with randomness in the lowest order of the randomness parameter and in the third order of exchange interaction between the spin and electrons. The previous result for non-interacting electrons are enhanced by a factor η−d⁄2, where η−1 is the Stoner enhancement factor and d is the dimensionality.View full abstractDownload PDF (336K) -
Yukimichi Tajima, Mitsuru Morita, Kazuhiko Yamaya1986 Volume 55 Issue 7 Pages 2121-2124
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe voltage-current(V-I) characteristics measured near the superconducting(SC) transition in TaSe3 exhibited anomalies of the voltage gap and the offset voltage at I→0. These anomalies are interpreted in terms of an unusual emf which appeared just within the SC transition region. It is suggested from the sample dependence of the voltage gap and the offset voltage that a.c. effects on the SC transition play an important role for the mechanism of the unusual emf.View full abstractDownload PDF (456K) -
Masayuki Itoh, Isao Yamada, Koji Ubukoshi, Kinshiro Hirakawa, Hiroshi ...1986 Volume 55 Issue 7 Pages 2125-2128
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESS7Li NMR measurements have been made in order to investigate the microscopic magnetic properties of the triangular lattice antiferromagnet LiNiO2 which shows the successive change in the magnetization process at TN1∼210 K and TN2∼20 K. From the NMR shift vs the magnetic susceptibility plots above about 200 K the transferred hyperfine coupling constant was determined to be 0.35±0.07 kOe/μB. The 7Li NMR signal at 4.2 K and under the zero external field has been observed. The spectrum has a peak at about 6.0 MHz which corresponds to the internal field of 3.6 kOe. This fact indicates the existence of a magnetically ordered state in LiNiO2 below TN2.View full abstractDownload PDF (396K) -
Keiko Ogawa, Masashige Onoda, Hiroshi Nagasawa1986 Volume 55 Issue 7 Pages 2129-2132
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe present the EPR and NMR results on the quasi-one-dimensional conductor α′-NaxV2O5 (x=1.0, 0.9 and 0.78) in the temperature range from 12 K to 397 K. The spin susceptibility extracted from EPR measurements has a broad maximum around room temperature. The 51V NMR line shift associated with the V4+ ion increases with decreasing temperature below room temperature. The ground state of the V4+ ion is spin-singlet and it is understood as bipolaronic state, which is the electron pairs of the adjacent V4+ ions formed by the strong electron-phonon interaction. In the case of x=1.0, it is pointed out that there are the vanadium zigzag chains occupied by the only V4+ ions, where the electron wave function overlaps directly.View full abstractDownload PDF (476K) -
Fumio Komori, Takayuki Goto, Shun-ichi Kobayashi1986 Volume 55 Issue 7 Pages 2133-2136
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn anomalous nuclear spin depolarization is observed in field cycling experiments of aluminum small particles at 30 mK. The depolarization time is of the order of several minutes and depends on the size of the particles. The origin of the depolarization is assigned to the large quadrupole interaction of 27Al nucleus in random electric field gradient of the small particles.View full abstractDownload PDF (428K) -
Ryogo Hirota1986 Volume 55 Issue 7 Pages 2137-2150
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe rational solutions to the classical Boussinesq equation conjectured by Nakamura and the author are proved to be true by the use of the Wronskian technique developed by Freeman and Nimmo. It is also found that a non-auto Bäcklund transformation between a rational solution of the spherical Boussinesq equation with a time-dependent velocity term is nothing but the similarity form of the classical Boussinesq equation.View full abstractDownload PDF (1212K) -
Hiroshi Orihara, Yoshihiro Ishibashi1986 Volume 55 Issue 7 Pages 2151-2156
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have investigated the dynamical behavior of twisted nematic crystals quenched from an isotropic phase into a nematic phase. In such a system the collective motion of an assembly of disclination can be observed and a dynamical scaling law was found. The u-field theory developed by Ohta, Jasnow and Kawasaki was applied to analyze the obtained data.View full abstractDownload PDF (1020K) -
Hikaru Kawamura1986 Volume 55 Issue 7 Pages 2157-2165
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRenormalization-group ε expansion is carried out for the n-component classical Heisenberg antiferromagnet on the d-dimensional layered-triangular lattice where the frustrated triangular nets are stacked along the remaining d-2 directions making a cubic structure. The associated Landau-Ginzburg-Wilson Hamiltonian is derived, which has essentially the same form as the one derived by Jones et al. for the superfluidity phase transition of helium 3. To O(ε), four fixed points are found. Frustration is relevant only in one of these fixed points which is stable for larger values of n, i.e., n>21.8. In the Heisenberg case n=3, no stable fixed point is found. To O(ε2), however, the stability region of the fixed point where the frustration is relevant is considerably widend at finite ε. Some discussions are given on the nature of phase transition of the three-dimensional triangular-lattice Heisenberg antiferromagnet.View full abstractDownload PDF (1068K) -
Atsuo Kuniba, Yasuhiro Akutsu, Miki Wadati1986 Volume 55 Issue 7 Pages 2166-2176
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe propose a k-state IRF model (k≥2). The hard core conditions on these models are directly related to the generalized Rogers-Ramanujan identities in the partition theory of natural numbers. We predict that it is exactly solvable for all k. The conjecture holds for k=2, 3 and 4.View full abstractDownload PDF (920K) -
Hideo Tsuru1986 Volume 55 Issue 7 Pages 2177-2182
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe equations of motion for a thin rod subject to the linear elastic law, are derived through the variational method. Without nonlinear terms, the dynamical equations are reduced to the well-known wave equations for the thin rod. When the rod is confined on a plane and has no torsional motion, a soliton propagates along the thin rod.View full abstractDownload PDF (596K) -
M. A. Hossain1986 Volume 55 Issue 7 Pages 2183-2190
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of Hall current on the unsteady laminar free convection flow of a viscous incompressible and electrically conducting fluid near an infinite vertical porous flat plate subjected to a suction/injection velocity inversely proportional to the square-root of time is investigated in the presence of a constant magnetic field. The results are discussed with the effects of the magnetic number Mt, the Hall parameter m, and the suction/injection parameter a for Pr (the Prandtl number)=0.71 and 7.0, which represent air and water.View full abstractDownload PDF (764K) -
Toshio Funada1986 Volume 55 Issue 7 Pages 2191-2202
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Marangoni instability of a thin liquid sheet driven by the surface tension gradient (due to variations of temperature or of mass concentration) is studied by means of a linear theory. It is found that the critical Marangoni number for the steady mode can be expressed by a simple function of the wave-number when the two boundaries of the sheet are flat. When the surface deformations are taken into account, another type of instability may occur for small values of the Biot number. The effect of deviation of the surface tension coefficient from the mean value at the free surfaces and the resulting surface patterns made up by the surface deformations at small wave-numbers are also discussed.View full abstractDownload PDF (1264K) -
Yoshiki Maejima, Yoichi Hirano, Toshio Shimada, Kiyoshi Ogawa1986 Volume 55 Issue 7 Pages 2203-2210
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurments of radiation loss from RFP plasma in TPE–1R(M) have been made using a multi-layer thin film bolometer. In normal operating conditions of TPE–1R(M), the radiation loss has less effect on the global power balance since only 10–15% of joule input power is lost by the radiation. However, it increases to 35% or more in the high plasma current region. The content of iron impurity is estimated at 1–3% of the electron density from the measured radiation power in typical discharges. The volt-second consumption during the start-up phase has also been measured. The resistive volt-second loss for setting-up the RFP configuration is evaluated to be about 50% of the applied volt-second into the linear, which corresponds to ∼1⁄3 of the total volt-second, and is proportional to the plasma current to be established.View full abstractDownload PDF (928K) -
Katsumi Hirano, Yutaka Tagaya, Katsuji Shimoda, Yushiro Okabe, Toshika ...1986 Volume 55 Issue 7 Pages 2211-2216
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSoft X-rays emitted from a plasma focus are investigated experimentally. In contrast to single-pulsive burst of neutron, hard X-rays, ion- and electron beams, the soft X-rays are observed from the collapse phase to the decay phase of the plasma column, and have typically three successive peaks in its signal. Each peak corresponds to the maximum compression, the disruption and the decay phase of plasma column. It is revealed that the first and the second peaks are radiated by plasma itself, whereas the third peak is caused by emission from the inner electrode face.View full abstractDownload PDF (980K) -
Nagao Kamijo, Hiroyuki Kageyama, Kichiro Koto, Hironobu Maeda, Moritak ...1986 Volume 55 Issue 7 Pages 2217-2231
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEXAFS and XANES measurements are made for (Bi2O3–Y2O3) system, (Bi2O3)0.75(Y2O3)0.25 at 300 K and (Bi2O3)0.6(Y2O3)0.4 at 60 K and 300 K, to elucidate their defect structure and the glass-like behaviors at low temperatures. In both ceramics the larger chemical shift of Y K-edge to lower energy measured from that of Y2O3 is observed as compared with that of Bi L3-edge measured from that of Bi2O3. Small coordination number of oxygen around Y ion is also obtained by curve-fitting analysis of EXAFS for these ceramics. The results imply that oxygen defect mostly concentrates around dopant yttrium cation preserving charge balance with each other. To elucidate the glass-like behavior at low temperatures (below 12 K), schematic microscopic model of the defect structure is presented based on the data obtained here.View full abstractDownload PDF (1244K) -
S. K. Kor, Kailash1986 Volume 55 Issue 7 Pages 2232-2234
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSStarting from lattice constant, hardness parameter and assuming the Lundquist potential, the ultrasonic attenuation due to phonon-viscosity mechanism and thermoelastic loss has been evaluated in semiconducting crystals having ZnS structure, viz. ZnSe, ZnTe, GaAs and GaSb. The results were found in well agreement with available theoretical and experimental values. It is pointed out that ultrasonic attenuation is the basic property of the substance.View full abstractDownload PDF (364K) -
Yoshinori Nakane1986 Volume 55 Issue 7 Pages 2235-2246
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAnomalies of the sound velocity and ultrasonic attenuation coefficient at an incommensurate CDW transition temperature (Tc) are investigated in a quasi-one-dimensional system. A scaling relation between the anomaly above Tc and that below Tc is established. The temperature dependence of the anomaly shows a cross-over from one to three dimensions according to a change of the dimensionality of critical fluctuations. The accoustic anomalies are shown to be enhanced by breaking of the charge conjugation symmetry resulting from the nonlinearity of the electron dispersion. As a result, the sound velocity shows a dip which diverges as f3⁄2(τ) for τ>>τ1 and as (τ⁄τ1)f3⁄2(τ) for τ\lesssimτ1 where τ=|(Tc−T)⁄Tc|, fn(τ)=τ−n and τ1 is a non-dimensional cross-over temperature. The ultrasonic attenuation coefficient diverges at Tc as f5⁄2(τ) for τ>>τ1 and as (τ⁄τ1)f5⁄2(τ) for τ\lesssimτ1. For both anomalies, the scaling relation shows that fn(τ) above Tc is transformed into 2fn(2τ) below Tc.View full abstractDownload PDF (1168K) -
R. K. Ram, S. S. Kushwaha, R. K. Shukla1986 Volume 55 Issue 7 Pages 2247-2252
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe root mean square amplitudes of the constituent atoms in II–VI and III–V binary compound semiconductors as a function of temperature have been calculated using new dynamic model (R. K. Ram and S. S. Kushwaha: J. Phys. Soc. Jpn. 54 (1985) 617.). The calculated results have been compared with the available experimental data. The melting criteria of these compounds have been also explained.View full abstractDownload PDF (572K) -
Michihiro Furusaka, Yoshikazu Ishikawa, Sadae Yamaguchi, Yutaka Fujino1986 Volume 55 Issue 7 Pages 2253-2269
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe very early stage as well as late stage of phase separation process in FeCr alloys (Fe-20, 30, 40, 60 at%Cr) have been studied by pulsed cold neutron small angle scattering instrument (SAN). At the early stage, scattering intensity I(q) obeys q−2 dependence at the high q side of the scattering function. The results are in accord with the theory of Langer et al. which takes into account nonlinear and thermal fluctuations effects. At the late stage where I(q) shows q−4 dependence, a dynamical scaling law holds, while it is not the case for the earlier stage. Phase diagram of FeCr system is also determined by critical scattering measurements.View full abstractDownload PDF (1632K) -
Yukikuni Akishige, Masakazu Kobayashi, Kikuo Ohi, Etsuro Sawaguchi1986 Volume 55 Issue 7 Pages 2270-2277
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTemperature dependence of the dielectric constant, D-E hysteresis loops and pyroelectric charges in Sr2Nb2O7 have been studied in the temperature range from 4.2 K to 300 K. In addition to the well known ferroelectric transition at 1615 K, another ferroelectric phase transition occurs at T0∼100 K. The dielectric constant along the b-axis shows a large ferroelectric anomaly at T0 and the Curie-Weiss constant above T0 is 8.0×103 K. On cooling, the direction of the spontaneous polarization Ps begins to deviate at T0 from the original c-axis of the high temperature ferroelectric state and the new b-component of Ps appears; the b-component is 2×10−2 C/m2 at 4.2 K. Effects of a dc biasing field on the dielectric constant have been examined. With increasing the field strength, the dielectric constant decreases and the transition temperature shifts to the high temperature side. The results are analyzed with the phenomenological theory developed by Devonshire.View full abstractDownload PDF (840K) -
Shigenori Tanaka, Setsuo Ichimaru1986 Volume 55 Issue 7 Pages 2278-2289
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe dielectric formulation is applied to the study of the static correlations in the electron liquids at finite temperatures. The strong coupling effects arising from the exchange and Coulomb correlations are taken into account through the local-field correction in the Singwi-Tosi-Land-Sjölander approximation. The resulting integral equations are solved self-consistently, and the thermodynamic quantities are evaluated at various combinations of the plasma parameters in the range of the intermediate Fermi degeneracy. The results are parametrized in the form of the analytic formulas, which satisfy a number of exact boundary conditions and limiting behaviors.View full abstractDownload PDF (1216K) -
Masayuki Shiga, Mitsuo Miyake, Yoji Nakamura1986 Volume 55 Issue 7 Pages 2290-2295
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThermal expansion, magnetic susceptibility and NMR have been measured for bcc Cr1−xMnx alloys with 0.4≤x≤0.66. A large negative thermal expansion was observed at low temperatures in the alloys with x>0.6, which were prepared by high temperature quenching. On an assumption of the existence two electronic states of bcc Mn with different magnetic moments and atomic volumes, this phenomenon is discussed in connection with the variations of the hyperfine field distribution at 55Mn nuclei.View full abstractDownload PDF (428K) -
Akira Terai, Masao Ogata, Yasushi Wada1986 Volume 55 Issue 7 Pages 2296-2304
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have studied interactions between a soliton and phonons in trans-polyacetylene. It is found that effect nonlinear in interacting phonon amplitudes gives rise to a shift of the soliton location. When there is a soliton at rest, it was known the linearized equation of motion for optical phonons has four types of independent solutions, translation mode, other two localized modes, and propagating phonons. In the second order approximation, these modes interact. An incoming phonon produces a translation of the soliton, giving rise to its random walk. The magnitude of the translation is calculated as a function of phonon wave number. It is from four to six times as large as that of a φ4-soliton.View full abstractDownload PDF (888K) -
Masao Ogata, Akira Terai, Yasushi Wada1986 Volume 55 Issue 7 Pages 2305-2314
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDiffusive motion of a soliton in trans-polyacetylene is studied theoretically within the adiabatic approximation of the Takayama Lin-Liu and Maki model. The collective coordinate method is applied to obtain an equation of motion of the soliton. It bears a remarkable similarity to that in the φ4 model. Shift of the soliton location is induced by collision with classical phonon, which is excited thermally. It leads to a random walk of the soliton. The dynamical diffusion constant D(ω) and the friction Γ(ω) are calculated in the low temperature expansion. It is shown that the real part of D(ω) is proportional to T2, when the frequency is not zero and Γ(ω) is larger than Γ(0). Its magnitude is hundred times as large as that of the φ4 kink.View full abstractDownload PDF (1088K) -
Yoshihiro Ishibashi, Hiroshi Orihara1986 Volume 55 Issue 7 Pages 2315-2319
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe characteristic aspects of a poly-nuclear growth model, which was found to provide a better agreement with the Monte Carlo simulation result than those proposed previously, are described and discussed. It has turned out that an approximately steady growth state is attained soon after initiation of the growth. For the one-dimensional case the obtained growth rate is compared with an analytical result by Seto and Frank.View full abstractDownload PDF (452K) -
S. Chattopadhyay, A. P. Deshpande1986 Volume 55 Issue 7 Pages 2320-2325
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe K absorption edges of chromium and selenium in CrSe2 have been recorded using a Cauchois type bent crystal spectrograph of diameter 0.4 m. The shifts in the positions of these edges with respect to those in the pure elements show that chromium is a cation and selenium is an anion; and it exhibits the d2sp3 type of bonding in CrSe2. The various features of the near edge structure have been assigned to transitions of the core state electron to the available unoccupied states in the conduction band. Based on these transitions a band picture is proposed. The EXAFS associated with the chromium and selenium edges have been analysed in the light of the graphical method proposed by Lytle, Sayers and Stern.View full abstractDownload PDF (588K) -
Hiroshi Akera, Hiroshi Kamimura1986 Volume 55 Issue 7 Pages 2326-2337
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe band structures of C8Rb, C8K1−xRbx and a new superlattice C24KRb2 are calculated for the first time using the self-consistent pseudopotential method and a mechanism of the anomalous softening observed in this mixed crystal at x=2⁄3 is investigated from the electronic standpoint. In the band structure calculation of the mixed crystals C8K1−xRbx, the virtual crystal approximation is used. It is shown that x=2⁄3 is a magic number in a sense that a saddle point type van Hove singularity in the density of states of three-dimensional interlayer bands touches just at the Fermi level and that this van Hove singularity gives rise to softening in the elastic constant.View full abstractDownload PDF (1352K) -
Yasumitsu Ohta, Kiyoshi Kawamura, Takuro Tsuzuku1986 Volume 55 Issue 7 Pages 2338-2342
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe intrinsic electrical resistivities in c-direction (ρc) of stages-1 and -2 graphite intercalation compounds (GIC) with ICl have been successfully determined. The temperature dependence is qualitatively metallic-like, and does not show any thermal hysteresis so far considered to be characteristic of acceptor-type GICs. Dominant carriers are positive holes not less than 5×1020 cm−3. The mobility values whereby computed are too low to deal with the matter on the basis of the band model. An interpretation has been given by Sugihara’s “impurity-assisted hopping mechanism” which however is modified so as to take into account the change of the transfer integral Js(k−k′) caused by thermal change of the interlayer spacing.View full abstractDownload PDF (584K) -
Tomi Ohtsuki, Yoshiyuki Ono1986 Volume 55 Issue 7 Pages 2343-2356
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSApplying the self-consistent treatment of the Anderson localization problem to three dimensional systems under strong magnetic fields, we calculate the anisotropic static diffusion coefficients in the case when the Fermi level is within the lowest Landau subband. Two coupled self-consistent equations are derived through partial summation of diagrams for two diffusion coefficients D⁄⁄ and D⊥ which describe the electronic diffusion along and perpendicular to the field, respectively. They decrease with increasing magnetic field and vanish linearly at a critical field which is determined by εF0 and τ0, the zero field value of the Fermi energy and the elastic relaxation time, the ratio D⊥⁄D⁄⁄ remaining finite and non-vanishing. The cyclotron frequency ωcrt corresponding to the critical field is found to satisfy (εF0⁄ωcrt)(εF0τ0)1⁄4=0.509.View full abstractDownload PDF (1404K) -
K\={o}ki Takanashi, Hiroshi Yasuoka, Noriaki Nakayama, Tsutomu Katamot ...1986 Volume 55 Issue 7 Pages 2357-2363
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA 55Mn NMR investigation has been made on the interface magnetism in Fe/Mn artificial metallic superlattice (AMS). The signal associated with the ferromagnetically ordered Mn sites was observed in a wide frequency range. The chemical composition profile was extracted from the distribution of 55Mn internal fields, and it is suggested that the compositional mixing occurs over a wide range (at least 15 Å) near the interface in Fe/Mn AMS. From this, the interface alloy region was found to be ferromagnetic even in the Mn dense region, which cannot be expected for FeMn alloys in the thermal equilibrium. Thus it is concluded that a new-type alloy is created near the interface in the Fe/Mn AMS by making multilayers.View full abstractDownload PDF (704K) -
Bunjyu Shinozaki, Takasi Kawaguti, Yasunobu Fujimori1986 Volume 55 Issue 7 Pages 2364-2368
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn the wide range of the magnetic field, the magnetoconductance in thin Al films agrees well with the theory of Santos and Abrahams and also of Maekawa, extending Larkin’s theory to higher magnetic fields at temperatures slightly above superconducting transition temperature Tc. The inelastic scattering rate 1⁄τin obtained from magnetoconductance measurements increases rapidly with decreasing temperature near Tc. The pair-breaking parameter δ, which is deduced from the measurements and related to the 1⁄τin, implies the temperature dependence shown by Patton and also Keller and Korenman. It is about the half of that estimated from the Maki-Thompson contribution to the excess conductance due to fluctuations at zero magnetic field.View full abstractDownload PDF (560K) -
Hidekazu Tanaka, Fujio Tsuruoka, Tetsuya Ishii, Haruhiko Izumi, Katsun ...1986 Volume 55 Issue 7 Pages 2369-2374
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic phase transition in the quasi-one-dimensional antiferromagnet TMMB was studied by susceptibility and torque measurements. A small jump in susceptibility data was observed at the structural phase transition point, Tt=144 K. The intrachain exchange interaction J⁄kB was found to be −5.0 K for T<Tt and −4.5 K for T>Tt. The phase diagram of temperature versus magnetic field applied along the c-axis is presented. Three-dimensional antiferromagnetic ordering occurs at TN=2.54 K. When the c-axis-component of external magnetic field reaches ∼5 KOe, a first order transition from the antiferromagnetic phase to a phase with a weak-ferromagnetic moment (∼0.5% of gμBS) along the c-axis takes place. Origins of the weak-ferromagnetic moment are discussed.View full abstractDownload PDF (704K) -
Kenji Kawaguchi, Ryoichi Yamamoto, Nobuyoshi Hosoito, Teruya Shinjo, T ...1986 Volume 55 Issue 7 Pages 2375-2383
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSArtificial metallic superlattices were synthesized from an insoluble combination, Fe–Mg, by alternate deposition in ultrahigh vacuum. The shortest artificial periodicity confirmed by X-ray diffraction was Fe(4 Å)–Mg(4 Å). A sample with Fe monolayers, [Fe(1 Å)–Mg(16 Å)], was prepared successfully. Magnetic properties were studied from Mössbauer and SQUID measurements. Novel magnetic properties were observed in extremely thin Fe layers. Mg-diluted Fe alloys prepared by co-deposition were also investigated and have been compared with artificial superstructure films.View full abstractDownload PDF (1232K) -
Sigeru Takayanagi, Yoshichika \={O}nuki, Takemi Komatsubara1986 Volume 55 Issue 7 Pages 2384-2389
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe anisotropic magnetic susceptibilities of cerium intermetallic compounds, CeCu2Si2, CeCu6 and CeCu2 single crystals have been analyzed using the crystal field theory. The susceptibility calculated on the basis of appropriate crystal field level scheme of each compound explains fairly well the temperature dependence and anisotropy of the measured susceptibility.View full abstractDownload PDF (560K) -
Yoshinori Takahashi1986 Volume 55 Issue 7 Pages 2390-2399
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDynamical spin susceptibility in itinerant electron ferromagnets is discussed by taking into account the damping effects of spin fluctuation modes above the Curie temperature. Based on a simple mode-mode coupling approximation, numerical calculations for the dynamical structure factors of Fe, Ni, and Fe3Pt are made and compared with recent neutron scattering experiments.View full abstractDownload PDF (1112K) -
Satoru Watanabe, Yoshihito Abe, Ryozo Yoshizaki1986 Volume 55 Issue 7 Pages 2400-2409
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe proton spin-lattice relaxation in orthorhombic acetamide has been investigated between 250 K and 20 K at 25.0 MHz and 11.4 MHz. The temperature dependence of the spin-lattice relaxation was explained from the consideration of the rotational tunneling motions of two inequivalent methyl groups having different tunneling frequencies, ωT=119±20 MHz and another one estimated to be a few hundreds MHz. Nonexponential magnetization recovery observed in the temperature region above 40 K was explained in terms of rapidly reorientating three spin systems. The spin-lattice relaxation rate of 1H NMR was also compared with that of 14N NQR in the same acetamide.View full abstractDownload PDF (1232K) -
Michio Naito, Hironori Nishihara, Shoji Tanaka1986 Volume 55 Issue 7 Pages 2410-2421
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) of the 181Ta nuclei have been made on 1T-TaS2 at 4.2 K in order to get detailed information on the superlattice structure in the commensurate charge density wave state of this material from a microscopic viewpoint. The NMR ane NQR spectra are consistent with the star-shaped cluster model inferred from diffraction experiments. Furthermore the spectra indicate that the commensurate phase of 1T-TaS2 has a complicated and somewhat disordered stacking of CDW layers in contrast with that of isostructural 1T-TaSe2 (the ordered c0+2a0 stacking). On the basis of these results, we propose a new picture of the semiconductive origin of 1T-TaS2, including an explanation of the quite different behaviors of the low temperature conduction between 1T-TaS2 and 1T-TaSe2.View full abstractDownload PDF (1432K) -
Radiative and Non-Radiative Processes of S−−-Vacancy Centers and F-Center Formation in NaCl CrystalsMamoru Baba1986 Volume 55 Issue 7 Pages 2422-2426
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRadiative and non-radiative processes of S−−-vacancy pair centers and their relation to the F-center formation in NaCl crystals have been investigated between liquid helium temperature and room temperature. Two emission bands (4.10 and 2.09 eV) and their three excitation bands (5.65, 4.9 and 4.15 eV), which are ascribable to the centers, are observed. The intensities of the 4.10 and 2.09 eV emission bands decrease at high temperatures owing to the increased probabilities of non-radiative processes with activation energies of 0.22 eV for 4.10 eV emission and 0.06 eV for 2.09 eV emission. These non-radiative processes are discussed in connection with the formation of F centers.View full abstractDownload PDF (524K) -
Ken-ichi Mizuno, Atsuo Matsui1986 Volume 55 Issue 7 Pages 2427-2435
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe polarized absorption and luminescence spectra of anthracene crystals have been investigated under high pressures and at room temperature. A satellite absorption band which shifts to lower energy with increasing pressure is found to be related with the vibronic luminescence series. As the origin of the vibronic luminescence a model of a quasi-free exciton is proposed. The vibronic luminescence bands loose their intensity with pressure and are replaced by intrinsic self-trapped exciton luminescence at pressures higher than about 18 kbar. Self-trapping of excitons seems to be enhanced by the second order phase transition which occurs at 24 kbar. The exciton-phonon coupling constant at 22 kbar is estimated to be at least 1.6 which should be compared to 0.85 at ambient pressure.View full abstractDownload PDF (1148K) -
Shun-ichi Nakai, Masanao Ohashi, Tsutomu Mitsuishi, Hideki Maezawa, Hi ...1986 Volume 55 Issue 7 Pages 2436-2442
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSF–K X-ray absorption near edge structures (XANES) of alkali fluorides, Lid, NaF, KF and RbF are measured by a photoelectric yield method. Na–K spectrum of NaF is also measured. The short-range order multiple scattering calculations for each K spectrum of LiF and NaF are performed. From comparison of the observed spectra with the calculated results, the effective cation charges are estimated with q=0.70±0.05 and 0.74±0.04 for LiF and NaF, respectively. These calculated F–K XANES spectra of alkali fluorides are not so sensitive to the charge distributions as cation K XANES. These results are in contrast with the case of alkaline-earth fluorides.View full abstractDownload PDF (876K) -
Ken-ichi Kan’no, Hiroyuki Nakatani, Takuya Mukai, Osamu Arimoto, ...1986 Volume 55 Issue 7 Pages 2443-2456
Published: July 15, 1986
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLifetimes, emission yields, and their temperature dependence of the BG emission from localized excitons with the configuration of [ClI−+e] are investigated in KCl:I and RbCl:I from 1.9 K to 30 K. Below 4 K, the emission in KCl:I decays with two exponential components: τs∼8.0 ms and τf∼120 μs. In raising temperature, τs decreases rapidly to approach a constant value ∼170 μs, while τf remains constant up to ∼9 K where this component vanishes abruptly and is replaced by an appearance of a delayed ‘build-up’. Similar results are obtained in RbCl:I. Analysis is made in terms of phonon-induced transitions among zero-field-split triplet sub-levels. Concerning the spin-lattice relaxation mechanism, importance of ralaxation process of Orbach type is suggested in place of the one-phonon direct process which has been successful for the π-emission in KI.View full abstractDownload PDF (1572K) -
Takeo Jo, Akio Kotani1986 Volume 55 Issue 7 Pages 2457-2468
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSCore level spectra for a mixed valent insulator CeO2 and typical mixed valent metallic Ce compounds are discussed on the basis of the filled band Andersom model, which is found to give sufficiently correct core spectra even for a metallic system when the spin and orbital degeneracy of 4f orbitals is large. A remarkable difference in the 3d core photoemission spectrum and an apparent similarity in the 3d-core photoabsorption spectrum between CeO2 and metallic Ce compounds are consistently explained and an expected difference in the resonant photoemission spectrum near the Ce 3d threshold between the two systems is discussed. The 4f3 configuration of Ce atom is taken into account in the calculation and its effect on core spectra is discussed. The analysis of core spectra neglecting the 4f3 configuration can be shown to underestimate the Coulomb interaction between 4f electrons. So far proposed assignment for peak of core spectra is critically examined.View full abstractDownload PDF (1368K) -
Tadashi Kurihama, Takatoshi Izumi, Shozo Sawada1986 Volume 55 Issue 7 Pages 2469-2470
Published: July 15, 1986
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (204K)