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Volume 57, Issue 11
Displaying 1-50 of 58 articles from this issue
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Masao Nomura1988 Volume 57 Issue 11 Pages 3653-3656
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNovel solutions to the star-triangle equation for the IRF model are presented which are described in terms of 6−j and 9−j symbols. Additivity of spectral parameters does not hold in this case.View full abstractDownload PDF (304K) -
Shigeo Kida, Youichi Murakami1988 Volume 57 Issue 11 Pages 3657-3660
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe energy decay law of turbulence is investigated by solving the Navier-Stokes equation numerically. High symmetry is imposed on the velocity field. The initial energy spectrum has the form of E(k)∝kn exp [−Ak2], n and A being constants. It is found that the energy decreases algebraically in time as ε(t)∝(t−t0)−p, where p≈1.25 and 1.30 for n=2 and 4, respectively. During these algebraic decays the microscale Reynolds number changes between 20∼10. The Kolmogorov similarity law holds irrespective of the difference of the large-scale motions or the difference of the energy decay laws.View full abstractDownload PDF (452K) -
Motomi Iida, Takashi Maekawa, Hitoshi Tanaka, Shunsuke Ide, Kazuo Ogur ...1988 Volume 57 Issue 11 Pages 3661-3664
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSawtooth oscillations appearing in Ohmically heated (OH) plasmas are suppressed by the lower hybrid current drive (LHCD) in the WT-3 tokamak (R=65 cm, a=20 cm, Ip\simeq100 kA, \barne=1−2×1013 cm−3, qa\simeq4.5, and PLH\gtrsim100 kW). After the suppression, sawteeth reappear following m=1 oscillations in the LHCD plasmas. The latter sawteeth have a large amplitude and long period (Ts=2–5 msec), compared with the former one (Ts=0.5–1.5 msec). Furthermore, they do not accompany a precursor and crash very fast.View full abstractDownload PDF (504K) -
Taizo Yamamoto, Yukikuni Akishige, Etsuro Sawaguchi1988 Volume 57 Issue 11 Pages 3665-3667
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFor determining the space group of the intermediate phase (74 K<T<222 K) of hexagonal-type BaTiO3, X-ray oscillation photographs of a ‘twin-free’ single crystal have been analyzed. Twins which usually occur below 222 K have been successfully eliminated by applying a stress on the crystal. The space group is determined as orthorhombic C2221-D25.View full abstractDownload PDF (400K) -
Hideki Seto, Yukio Noda, Yasusada Yamada1988 Volume 57 Issue 11 Pages 3668-3671
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA detailed X-ray diffraction investigation has been carried out in the vicinity of fcc to fct phase transition temperature in Fe–Pd alloys in order to elucidate the premartensitic phenomena. Using a high-resolution spectrometer and with fine temperature control, the temperature dependence of the splitting of Bragg reflection as well as diffuse scattering were measured in detail. Just above the martensite transformation temperature, we found a new intermediate phase. This structure is characterized by a coherent mixture of the two kinds of tetragonal lattices with different tetragonality and is interpreted as a spatially modulated fct phase.View full abstractDownload PDF (516K) -
Shingo Katsumoto, Shun-ichi Kobayashi, Hatsumi Urayama, Hideki Yamochi ...1988 Volume 57 Issue 11 Pages 3672-3673
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSpecific heat C of κ-(BEDT–TTF)2Cu(NCS)2 was measured between Tc(10.4 K) and 3 K. An anomaly around Tc was observed. The specific heat data show unusual bending below Tc in the C⁄T versus T2 plot. At the lowest temperatures, C obeyed the T3 law and no residual T-linear contribution was observed.View full abstractDownload PDF (252K) -
Takehiko Mori, Hiroo Inokuchi1988 Volume 57 Issue 11 Pages 3674-3677
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThermoelectric power of organic superconductors, β-(BEDT–TTF)2I3 and (BEDT–TTF)2Cu(NCS)2 (BEDT–TTF: bis(ethylenedithio)-tetrathiafulvalene) is calculated by the integration of the Boltzmann equation on the basis of the two-dimensional tight-binding band models. This calculation provides the interpretation of the observed complicated temperature dependence and anisotropy of the thermoelectric power and a tool estimating the transfer integrals.View full abstractDownload PDF (452K) -
Junichi Wakabayashi, Atsuyuki Fukano, Shinji Kawaji, Kazuhiko Hirakawa ...1988 Volume 57 Issue 11 Pages 3678-3681
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetotransport experiments on a high mobility GaAs/AlGaAs heterostructure in magnetic fields up to 27 T and at temperatures down to 20 mK were performed. A structure in ρxy which shows the existence of the quantum liquid state at the filling factor ν=1⁄7 in a magnetic field up to 18 T was observed. However, the structure of ρxy with ν=1⁄7 at a magnetic field of 25 T was not observed. The possibility of the growth of the charge density wave and the coexistence of the quantum liquid state and CDW state due to the potential fluctuations are discussed in this paper.View full abstractDownload PDF (532K) -
Muneyuki Date1988 Volume 57 Issue 11 Pages 3682-3685
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA simple incommensurate mean field model is introduced to explain complex magnetic phase diagrams of various rare-earth intermetallic compounds such as CeSb and CeBi. The eigenstates and their energies of the Ising spin chain immersed in the exchange field with magnitude J, wave vector k and phase δ are determined. The spin S(r) is assumed to point in the local field direction. The eigenstates are classified into three groups, the irrational states, rational states {k} with δ=0 and rational states {k} with δ=π⁄2n where n is the state index given by a positive integer. The phase diagram of CeSb is sketched by the model. It is emphasized that the present model suggests an effect of the spin coupling to the formation of conduction band electrons and the effect on the heavy fermion and superconductivity is discussed.View full abstractDownload PDF (384K) -
Hideki Yoshizawa, Setsuo Mitsuda, Hideaki Kitazawa, Koichi Katsumata1988 Volume 57 Issue 11 Pages 3686-3689
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy neutron quasielastic scattering experiments, we observed a two-dimensional antiferromagnetic diffuse scattering in a superconducting La1.92Sr0.08CuO4−δ sample at room temperature as well as in a superconducting phase. The line shape of the magnetic diffuse scattering at 295 K is a conventional Lorentzian, whereas it changes to a non-Lorentzian shape at low temperatures, presumably being a double peak structure with the peaks shifted by 0.05a* from the antiferromagnetic zone center.View full abstractDownload PDF (576K) -
Hiroyuki Nagai, Masashi Takigawa, Hiroshi Yasuoka1988 Volume 57 Issue 11 Pages 3690-3693
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Knight shift (K) and the spin-lattice relaxation time (T1) of 59Co nuclei have been measured in the weak Pauli paramagnet, Y(Ni1−xCox)2. The values of K and (T1T)−1 for small x are larger than those for large x and they are insensitive to T and nearly constant, while the susceptibility increases with increasing x. These anomalous phenomena are explained by the change in the density of state of the Y atom and the 3d atom with x.View full abstractDownload PDF (344K) -
Syuji Kawada1988 Volume 57 Issue 11 Pages 3694-3697
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA mechanism of the drastic reduction of the relaxation time by doping of a small amount of KOH into ice Ih is discussed using the Eyring’s theory of the elementary rate process by introducing a phenomenological parameter. It is deduced that this reduction of the relaxation time is strongly attributed to the release of water molecules from the ice rule which acts as a strong limitation to proton rearrangement.View full abstractDownload PDF (404K) -
Kazuo Gesi, René Perret1988 Volume 57 Issue 11 Pages 3698-3701
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric properties of the {N(CH3)4}2ZnI4 crystal were studied between room temperature and 4.2 K. Two phase transitions were seen from dielectric constant anomalies at T1=254 K and Tc=210 K on cooling. Ferroelectric hysteresis loops were observed along the c-direction below Tc with a low frequency applied field of 0.0025 Hz. The spontaneous polarization obtained by pyroelectric charge measurement tended to be 2.5×10−3 C/m2 at 0 K.View full abstractDownload PDF (344K) -
Haruki Nakamura1988 Volume 57 Issue 11 Pages 3702-3706
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA reaction field in a protein molecule due to aqueous solvent, which is polarized by charges of the protein, has been calculated numerically. First, a Poisson equation for a macroscopic dielectric model of a protein in vacuo was solved by the self-consistent boundary method. Next, Poisson and Poisson-Boltzmann equations for the model of a protein in aqueous solvent were solved in the same manner. The reaction field was then obtained by taking the difference between the potentials of these two systems. The results agreed well with those calculated analytically for simple model cases. Applications of the present method of the particle-particle/particle-mesh algorithm were discussed for actual protein-solvent systems.View full abstractDownload PDF (540K) -
Kimiaki Konno1988 Volume 57 Issue 11 Pages 3707-3713
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSExtending an independent variable into complex and introducing an auxiliary function, we investigate nonlinear interactions between solitons for the Toda lattice by observing behavior of zeros of the function. The Newton’s method calculating them is identified with a complex dynamical system. We present numerical results of the Fatou set on the dynamics. According to motion of solitons, the set changes surprisingly. Since soliton solutions include the exponential function, the Fatou set is different from that of the polynomial and the rational functions.View full abstractDownload PDF (1356K) -
Takuji Kawahara, Masanori Takaoka1988 Volume 57 Issue 11 Pages 3714-3732
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWeak interactions of the oscillatory solitary waves for the fifth order Korteweg-de Vries equation are investigated in terms of a soliton lattice model. Numerical solutions of the three pulse periodic system show two types of chaotic changes of the inter-pulse distances, depending on the total periodicity length. As an increase of the deviation of the initial value from a fixed point with center-like singularity, periodic motions show frequency down-shifts and lead to chaotic behaviour. A bounded motion associated with one stable fixed point involves chaotic behaviour that is an irregular manifestation of modulation. Another motion associated with three stable fixed points involves chaotic behaviour ascribed to an irregular meandering among these fixed points. Observed frequency down-shifts are explained in terms of a perturbation analysis.View full abstractDownload PDF (1840K) -
Makoto Inoue, Tetsuhiko Chikyu, Xiao Hu, Masuo Suzuki1988 Volume 57 Issue 11 Pages 3733-3741
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ground states of the antiferromagnetic Heisenberg model on the triangular and square lattices are discussed with use of the combinatorial method on the basis of Anderson’s RVB (resonating-valence-bond) variational wave-function. Some properties of RVB states are studied systematically for finite system-size N up to 20 and are compared to the exact values. For the triangular lattice the estimated energy value ERVB=−2.08 is closer to the exact value than that of the spin-wave theory. The value ERVB=−2.36 is estimated for the square lattice. For the square lattice our RVB state is closer to the exact ground state than the Néel state is in the sense of a wave-function. The dimer problem has a close relation to RVB states and is used to count exactly the number of singlet-pair configurations.View full abstractDownload PDF (996K) -
Takao Yamamoto, Takeo Izuyama1988 Volume 57 Issue 11 Pages 3742-3752
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe statistical mechanics of the assembly of the dislocation lines in a three dimensional crystal is developed. Using the transfer matrix method, the statistical mechanics of the dislocations is transformed into the ground state problem of the two dimensional Fermion-Boson system. This approach gives a convincing proof for the free energy expression:
f(ρ)=−F1ρ ln Cρ+F2ρ+F3ρ2,
where ρ is the dislocation density, F1 and F3 are positive constants, and C is a constant of the order a2 (a being the lattice spacing). The constant F2 is positive at low temperatures but is negative at high temperatures.View full abstractDownload PDF (1180K) -
Makoto Katori, Masuo Suzuki1988 Volume 57 Issue 11 Pages 3753-3761
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe coherent-anomaly scaling is investigated for the approximations derived on the basis of the cluster-variation method (CVM). All of the mean-field critical coefficients are calculated in the Weiss, the Bethe and the Kikuchi approximations for the three-dimensional Ising model on the simple cubic lattice. The dynamical coefficients of the relaxation time are also obtained in the corresponding approximations for the kinetic Ising model. The non-classical values of critical exponents as well as the true value of critical temperature are estimated by extrapolating these approximants by the coherent-anomaly method. The results suggest that the approximations by the CVM possess the property of coherent-anomaly scaling.View full abstractDownload PDF (956K) -
Kulwant Singh, T. S. Gill, K. Singh1988 Volume 57 Issue 11 Pages 3762-3765
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe K-capture probabilities in the decay of 175Hf to 433 and 343 keV levels have been determined by the KX-ray-gamma ray sum peaks observed with a high resolution single intrinsic Ge detector.View full abstractDownload PDF (372K) -
Hirokazu Tezuka1988 Volume 57 Issue 11 Pages 3766-3772
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDifferential cross sections are calculated for photodisintegration of the two-nucleon systems in 4He and 9Be. Data used in the analysis are obtained from the reactions of 4He(γ, p) and 9Be(γ, p) with incident photon energy from 200 to 420 MeV, and outgoing protons at 30°, 60°, 90° and 105° in the laboratory system. The experimental cross sections are well-reproduced as a whole with correlated two-nucleon relative wave function.View full abstractDownload PDF (536K) -
Nicolò Arena, Sebastiano Cavallaro, Giovanni Fazio, Giorgio Gia ...1988 Volume 57 Issue 11 Pages 3773-3777
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe αd bidimensional spectra for the 7Li(3He, αd)α reaction at E(3He)=11.5 have been measured. The width of the (Jπ=1+, T=0) level of the 6Li nucleus at Ex=5.65 MeV excitation energy have been deduced. The Γ value of (1.6±0.3) MeV found is in line with the values deduced by the same reaction at incident energies of E(3He)=2.5 and 5.0 MeV. This shows that, in the range between 2.5 and 11.5 MeV, the apparent Γ width value does not seem to depend on the 3He bombarding energy.View full abstractDownload PDF (568K) -
Yoichiro Furutani, Hiroo Totsuji, Kunitaka Komaki, Masahiro Tanabe1988 Volume 57 Issue 11 Pages 3778-3789
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn effective potential of an isolated partially ionized high-Z ion, calculated within the framework of the statistical models of atoms, is injected into the one-electron Schrödinger equation, in view of evaluating the electron density and comparing it with the results of statistical models. Starting from this initial value, a self-consistent electron density is obtained on the basis of the density functional theory, where quantum natures of electrons are fully taken into account. Several remarks are given on the boundary conditions imposed upon the isolated ion.View full abstractDownload PDF (1124K) -
Shinichiro Yanase, Koji Nishiyama1988 Volume 57 Issue 11 Pages 3790-3795
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBifurcating solutions are obtained for a flow through a slightly curved tube of rectangular cross-section. An aspect ratio of cross-section, γ, is changed over 1≤γ≤5 with the Dean number fixed to be 100. If γ<3.02, there is only a two-vortex solution. If γ≥3.02, there are dual solutions one of which is a two-vortex solution, the other is a four-vortex solution. Numerical solution of the unsteady Navier-Stokes equation at γ=4.9 shows that a two-vortex solution changes toward a four-vortex solution when it is disturbed by asymmetric disturbances.View full abstractDownload PDF (612K) -
Masaki Takashima1988 Volume 57 Issue 11 Pages 3796-3801
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe transverse plane waves propagating in the horizontal direction in an unbounded binary fluid mixture having vertical temperature and concentration gradients are investigated in the presence of the Soret effect. It is shown that undamped waves cannot exist since the conditions for the propagation of undamped waves contradict the stability criteria for the undisturbed basic state. It is also shown that weakly damped waves can exist under the conditions that the undisturbed basic state is stable.View full abstractDownload PDF (532K) -
Tadao Honzawa1988 Volume 57 Issue 11 Pages 3802-3808
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSControlled excitation of nonlinear multimode waves, including slow and fast ion-beam modes as well as an ion-acoustic mode, has been realized in a linearly stable ion-beam-plasma system. The mechanism for the coexcitation of two unlike waves observed in the system is also clarified. Furthermore, nonlinear dispersion relations of the beam modes are experimentally determined from the amplitude dependences of the wave velocities and widths. The results are compared with the theoretical ones.View full abstractDownload PDF (944K) -
Atsushi Kamitani1988 Volume 57 Issue 11 Pages 3809-3819
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effects of the flux hole on the magnetohydrodynamic (MHD) stability of the spheromak are investigated. The plasma is assumed to be confined in a drum-type flux conserver and is assumed to be in a force-free magnetic field. A numerical code to integrate the linearized MHD equation is developed and the linear growth rates of the n=1 mode are evaluated as functions of the flux-hole size and the prolateness parameter L⁄R. Here n is the toroidal mode number, and L and R denote the height and the radius of the flux conserver. The results of computations show that the flux hole has the destabilizing effects, but stable configurations exist when the flux hole is small and the flux conserver is oblate enough to satisfy L⁄R\lesssim1.8±0.1.View full abstractDownload PDF (1124K) -
T. S. Yeoh, S. G. Teoh, H. K. Fun1988 Volume 57 Issue 11 Pages 3820-3823
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSX-ray diffraction data from as-grown and annealed single crystals of Sn1−x(Me)xTe (Me=Cr, Mn, Fe, Co and Ni; x ranges from 0.5 at% to 5.0 at%) were collected using the Syntex P21 four-circle diffractometer and subsequently analysed using the SHELX-76 computer programmes to obtain the relative shifts in positions of Sn and dopant, Me, in a unit cell. It has been found that substitution occurs on doping whereby the Me ion replaces the Sn ion. In addition, the Sn and Me ions are displaced from the original undoped Sn ion positions.View full abstractDownload PDF (404K) -
Masaaki Matsuda, Nobuo Niimura, Shoichi Kawano, Akira Nonaka, Noboru Y ...1988 Volume 57 Issue 11 Pages 3824-3827
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the mean-square thermal tensor of KH2AsO4 in the paraelectric phase has been investigated by neutron diffraction structure analysis. All the tensor elements except u22(H) are extrapolated to zero and u22(H) gives a positive intercept at 0 K. The temperature dependence of the H-site separation, δ, was obtained and was compared with that of KH2PO4. The result is well described by the order-disorder behavior of hydrogen.View full abstractDownload PDF (456K) -
Shin-ichi Nakashima, Yasuhiro Nakakura, Atsuo Wada, Karl Kunc1988 Volume 57 Issue 11 Pages 3828-3837
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLong period SiC polytypes exhibit a number of Raman bands which reflect their stacking sequence of atomic planes. The Raman spectra of these polytypes can provide information on the phonon frequencies and vibrational amplitudes in the basic polytype (cubic, zincblende structure). Assuming a zincblende type structure as an approximate structure of SiC polytypes, the relative Raman intensity of folded modes in two SiC polytypes is calculated with several models of lattice dynamics and compared with the observed spectra. In the framework of a simple bond-polarizability model we show how the analysis of intensities can be used to rate different phenomenological models.View full abstractDownload PDF (1088K) -
Kazuhiro Hara, Yoshihiro Ishibashi1988 Volume 57 Issue 11 Pages 3838-3842
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSEvolution of the light scattering and electrical properties of the tungstic acid during the gelation process has been investigated. The scattered light becomes anisotropic and the depolarized scattering grows strong around 2 hours after the beginning of gelation. On the other hand, the resistance shows a steady increase. With the results obtained from the present study, we concluded that the light scattering mechanism changes from the Rayleigh scattering to the Mie scattering with the progress of gelation.View full abstractDownload PDF (536K) -
Shoji Hirokawa, Tomoko Iwasaki1988 Volume 57 Issue 11 Pages 3843-3850
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe orientational ordering of guest H2S molecules is studied using a mean-field theory on the basis of quantum statistical mechanics; it is assumed that the guest system is a quenched one consisting of a normal mixture of ortho and para H2S, and that the guest molecules which are influenced by a crystalline field, of which strength is estimated from far-infrared spectra, couple with one another via dipolar interactions. A phase diagram based on an effective dipole moment p is obtained. It shows: If p=0.800D, a second-order transition between a partially disordered and a disordared phase occurs at T=15.2 K, and the temperature dependence of the heat capacity well coincides with experiment; if p<0.778D, no cooperative order is expected.View full abstractDownload PDF (800K) -
Yoshimi Tsuchiya1988 Volume 57 Issue 11 Pages 3851-3857
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe molar volume of the liquid Se–Te system has been measured using a high energy γ-ray attenuation method. The thermal expansion coefficient, αp, deduced from the dependence on temperature of the molar volume has a minimum which shifts to the higher temperature with Se concentration. It has been shown that αp consists of two parts, one due to the normal expansion effect and the other associated with the structural change in the liquid. The latter has a linear relation with the anomalous part of the specific heat. Discussion is given on a model describing the structural evolution with temperature and/or pressure.View full abstractDownload PDF (820K) -
Hisashi Takenaka, Chisato Ogihara, Kazuo Morigaki1988 Volume 57 Issue 11 Pages 3858-3867
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe conduction band tail electron resonance was observed at 2 K in a-Si:H by time-resolved optically detected magnetic resonance experiments, using intense pulsed excitation. The exchange interaction between the tail electrons and the trapped holes at A centres was elucidated by the observation of shift of the A centre g-value with delay time of the microwave pulse after pulsed excitation. Dynamical processes of radiative and nonradiative recombination are discussed on the basis of the experimental results,View full abstractDownload PDF (1056K) -
Fumio Komori, Takayuki Goto, Koh-ichi Wago, Shun-ichi Kobayashi1988 Volume 57 Issue 11 Pages 3868-3874
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Knight shift of 27Al in small Al particles is measured in wide ranges of temperature and magnetic field. The samples with diameters smaller than 240 A are investigated. We observe the change in the hamiltonian symmetry with increasing field as a recovery of spin paramagnetic susceptibility. We also observe the critical magnetic field of superconductivity due to orbital pair-breaking effect.View full abstractDownload PDF (988K) -
Kenji Yonemitsu, Yoshiyuki Ono, Yasushi Wada1988 Volume 57 Issue 11 Pages 3875-3886
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffects of electron correlations are studied in trans-polyacetylene up to the second order with respect to the fluctuations around the Hartree-Fock solution. We present results for a spin soliton, which has a negative spin density due to correlations. It is found that the second-order corrections suppress the dependences of the creation energy, the position of the midgap level and the spin density profile on correlations in the Hartree-Fock approximation, and that the suppression is large when the spin density alternation around the soliton is large. Comparing the present results with recent ENDOR experiments, we find that the observed spin density profile can be reproduced if we take the dimensionless electron-lattice coupling strength λ=0.1, the onsite Coulomb energy U=1.6t0 and the nearest-neighbor interaction V=0.8t0, with t0 as the nearest-neighbor hopping integral.View full abstractDownload PDF (1192K) -
Katsuma Yagasaki, Tomoko Higa, Takeshi Hiraoka, Yowa Kadena1988 Volume 57 Issue 11 Pages 3887-3895
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electrical resistivity ρ and the Hall resistivity ρH of LaAg1−xInx (0<x<0.7) have been measured and analyzed on the basis of two-band model. The calculated temperature dependence of ρ and ρH agree well with the experimental ones. The s electrons are about 0.2 per unit cell for all x and change little at the band Jahn-Teller transformation temperature TM. The d-hole is in a range of 0.6–0.9 per unit cell and its number changes at TM. The total s-electron conductivity is about 30% of all and is very large compared with YZn and heavy rare earth RAg1−xInx (R=Gd, Tb and Dy).View full abstractDownload PDF (892K) -
Yoshitake Ueda, Hiroki Hosoda, Takao Kino1988 Volume 57 Issue 11 Pages 3896-3902
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe low-field Hall coefficient RH0 and transverse magnetoresistance coefficient Pt0 have been measured in a monocrystalline specimen of zone-refined aluminium quenched from 553 and 573 K. The measurements have been made at 4.2 K with asuperconducting chopper amplifier with a sensitivity better than 5 pV. For vacancies as scattering centres in aluminium, the low-field coefficients have been obtained as RH0=−2.02×10−11 m3·C−1 and Pt0=0.45×10−19 Ω2·m2·T−2. These data are analysed according to the three-group model of Kesternich [W. Kesternich: Phys. Rev. B13 (1976) 4227]. The scattering anisotropy due to a vacancy is similar to that due to Mn, Zn and Ag atoms, but different from that due to Li, Mg and Si atoms. It is concluded that the scattering potential of a vacancy strongly extends into the interstitial region.View full abstractDownload PDF (864K) -
Kazunari Ohshima, Tetsuo Fujita, Sanshiro Sako1988 Volume 57 Issue 11 Pages 3903-3909
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFor deposited layers of Sn fine particles as metal soot evaporated in inert gas, the superconducting critical field Hc and the transition temperature Tc were obtained by measuring their dc resistance. The temperature dependence of Hc is explained with the model of the cubic array of particles coupled through the Josephson junction. The coupling strength between the particles determined in this model decreases with increasing the particle size. This is supported by the thermogravimetric analysis where the thickness of the surface oxidized layer of the particle increases with increasing particle size. The enhancement of Tc is independent of the coupling between the particles, and depends only on the surface phonons of the particle.View full abstractDownload PDF (848K) -
Naoyuki Harada, Yoshihiro Miyamoto, Teruo Matsushita, Kaoru Yamafuji1988 Volume 57 Issue 11 Pages 3910-3919
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNonsaturated pinning characteristic and elastic and plastic properties of a fluxoid lattice are measured by an ac inductive method for superconducting Nb–Ta tapes with normal Nb2N precipitates. The interaction distance proportional to a yield strain of the fluxoid lattice is shown to be approximately constant except in the vicinity of the upper critical field, indicating that the fluxoid lattice is stabilized by strong pinning interactions by normal precipitates. The dependence of the pinning force density on the pinning parameters estimated from electron micrographs agrees better with the linear summation theory than the theory of Larkin and Ovchinnikov.View full abstractDownload PDF (1436K) -
Fusayoshi J. Ohkawa1988 Volume 57 Issue 11 Pages 3920-3931
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn effective Hamiltonian with auxiliary bosons and auxiliary fermions is proposed to treat the Hubbard Hamiltonian with strong correlation. Auxiliary particles themselves can not describe any real excitations. In particular, the Bose condensation of auxiliary bosons never occurs, and auxiliary fermions have no Fermi surfaces. Real excitations are described by two kinds of pair-excitations of auxiliary particles, such as fermionic and bosonic pair-excitations. Superconductivity in the effective Hamiltonian is nothing but the condensation of Cooper pairs between fermionic pair-excitations, which are formed by the superexchange interaction mediated by auxiliary fermions. The proposed model of superconductivity is consistent with anisotropic-singlet superconductivity previously examined by the present author (Jpn. J. Appl. Phys. 26 (1987) L652.), which is based on the Fermi liquid theory of the Hubbard Hamiltonian.View full abstractDownload PDF (1340K) -
Norio Ogita, Masayuki Udagawa, Kenichi Kojima, Kohji Ohbayashi1988 Volume 57 Issue 11 Pages 3932-3940
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMotivated by the observation of the close correlation between disappearance of the infrared absorption peak at about 680 cm−1 and the appearance of high-Tc superconductivity in (La1−xMx)2CuO4 (M=Ca, Sr, and Ba), we have measured infrared absorption spectra of (La1−xSrx)2NiO4 (x=0.0, 0.01, 0.02, 0.03 0.04, 0.07, 0.10 and 0.15), La2(Ni1−xCux)O4 (x=0.0, 0.20, 0.40 0.60, 0.70, 0.80, 0.85, 0.90, 0.95 and 1.00), and Raman spectrum of La2NiO4. No disappearance of the infrared absorption peak at about 680 cm−1 has been observed in (La1−xSrx)2NiO4. By assigning the peaks to characteristic lattice vibrational modes, discussions have been devoted to the possible origin of the infrared anomaly.View full abstractDownload PDF (1056K) -
Teruo Matsushita1988 Volume 57 Issue 11 Pages 3941-3945
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electric field induced by a fluxoid motion in a longitudinal magnetic field is presented. It is shown that the electric field is not given by the Josephson’s equation E=B×v, but by E=B×v−grad ψ, where B is the magnetic flux density, v is the fluxoid velocity and ψ is a scalar function. The scalar function ψ is not an electrostatic potential, since the electric field is caused by the induction and reduces to zero in the static situation (v→0). The reason for the appearance of the additional irrotational term, −grad ψ, is that v in this field geometry is a phase velocity directed normal to the Poynting flux.View full abstractDownload PDF (572K) -
Kiyohiro Sugiyama, Fumitoshi Iga, Mitsuo Kasaya, Tadao Kasuya, Muneyuk ...1988 Volume 57 Issue 11 Pages 3946-3953
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSHigh field magnetization and magnetoresistance of YbB12 are investigated up to 550 kOe at low temperatures with special interest in the semiconductive band gap energy under the field. Very large negative magnetoresistance is found and the system is perfectly metallic around 500 kOe with anomalous increase in the magnetization. The experimental results are explained by introducing the model that the band gap produced by the mixing of the f- and conduction electrons is destroyed by applying the field and the released f-electron gives an anomalous magnetization. The gJ-value is estimated as 1.9 for the f-level and this means that Γ8 may be most favourable for the responsible f-electron at the Fermi energy.View full abstractDownload PDF (824K) -
Chiaki Uyeda, Akio Yamagishi, Muneyuki Date1988 Volume 57 Issue 11 Pages 3954-3960
Published: November 15, 1988
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA systematic study of liquid oxygen under a high magnetic field is described. It is found that the experimental results of the field-induced transparency are not explained by the simple mean field method even though the magneto-volume effect, which enhances the field-induced transparency, is taken into account. The transparency effect is quantitavely explained by the spin-pair model where two spins of the O2 molecule pair couple with each other. The conclusion seems to be probable because the optical transition comes from one photon absorption by two ground state (3Σg−) molecules where the pair interaction may play an important role.View full abstractDownload PDF (624K) -
Akira Narita1988 Volume 57 Issue 11 Pages 3961-3972
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic susceptibilities of Gd monopnictides are calculated numerically for the semimetallic and metallic cases using the various tight binding band structures fitted to the APW result of LaP, and the carrier concentration effects on the spin orderings, θp and TN are investigated in detail, in which θp and TN are the paramagnetic Curie and Néel temperatures, respectively. The contributions to the susceptibilities caused by various scattering processes are analyzed in detail, and the main processes are clarified for the semimetallic and metallic cases. Comparisons with the experiments for Gd monopnictides and GdP–GdS systems are also performed. Our calculations give the best agreement with the experiments in the theoretical works so far carried out, although there are many discrepancies.View full abstractDownload PDF (1628K) -
Takehiko Oguchi, Hidetsugu Kitatani1988 Volume 57 Issue 11 Pages 3973-3978
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe coherent-anomaly method proposed by M. Suzuki is applied to the spin 1/2 ferromagnetic Heisenberg model to estimate the critical exponents. The effective Hamiltonian method to small-sized clusters for the simple cubic lattice, and the inverse temperature power series expansion of the susceptibility for the face centered cubic lattice are combined with the CAM. Both results show that the CAM is useful for the quantum spin systems.View full abstractDownload PDF (544K) -
ESR in Hexagonal ABX3-Type Antiferromagnets. I. Ground State Properties in Easy-Axis Anisotropy CaseHidekazu Tanaka, Soichiro Teraoka, Eiichiro Kakehashi, Katsunori Iio, ...1988 Volume 57 Issue 11 Pages 3979-4003
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe study ESR modes in the ground states of hexagonal ABX3-type antiferromagnets with easy-axis anisotropy such as CsNiCl3, RbNiCl3, CsMnI3. Taking a six sublattice model for the spin structure, we investigate the normal modes for the motions of the sublattice magnetizations within the framework of mean field approximation. In general, six kinds of modes are obtained by solving the classical equation of motion, dMi⁄dt=[Mi×Hi]. Frequency field diagram is presented. Ground state properties of fields for resonance and line widths of ESR spectra on CsNiCl3, RbNiCl3 and CsMnI3 are reported. Calculated values of resonance fields are in agreement with experimental results. The weak interchain exchange interaction constant J1 is estimated with good accuracy as J1⁄kB=−2.8×10−2 K for CsNiCl3 and −7.5×10−2 K for CsMnI3.View full abstractDownload PDF (2064K) -
Akiyoshi Sekine, Minoru Sumita, Toshio Osaka, Yasuharu Makita1988 Volume 57 Issue 11 Pages 4004-4010
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe pyroelectric charge of NH4Al(SO4)2·12H2O was measured after poling the crystal. It was found that the crystal becomes ferroelectric below the Curie temperature of Tc=−197°C on warming and has spontaneous polarization of 0.10 μC/cm2 at −240°C. The complex dielectric constant was measured at various frequencies in a frequency range between 330 Hz and 1×106 Hz. The crystal exhibited dielectric relaxation and showed a critical slowing down process of polarization. The observed temperature and frequency dependences of the complex dielectric constant can be well approximated in terms of single relaxation time τ(T) of the Debye-type. Above the Curie temperature, τ(T) was well described by the relation τ(T)=(h⁄kB)·(T−T0)−1·exp (ΔF⁄kBT) with the activation free energy ΔF=ΔF0[1−α(T−Tc)]. The values of ΔF0 and α were estimated to be 1.49×10−20 and 0.0028 deg−1, respectively.View full abstractDownload PDF (680K) -
Kiyoshi Deguchi, Hiroyuki Kobayashi, Eiji Nakamura, Hirotaka Yamaguchi ...1988 Volume 57 Issue 11 Pages 4011-4020
Published: November 15, 1988
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe complex dielectric constant of hexagonal BaTiO3(h-BT) along the ferroelectric axis has been measured in the frequency range from 103 Hz to 109 Hz. It is found that the specimen cooled in a strong d.c. electric field exhibits resonant-type dielectric dispersions around 1 MHz and 300 MHz both in the phase II (222 K>T>Tc=62 K) and the phase III (Tc>T). The dispersion around 1 MHz does not appear for the specimen cooled without the d.c. electric field. The effect of the field-cooling on these dispersions is discussed in connection with the twin structure expected from a group theoretical consideration. The dielectric anomaly around Tc diminishes in the damped dielectric constant, indicating that the ferroelectric phase transition in h-BT is closely related to an elastic instability.View full abstractDownload PDF (968K)