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Volume 58, Issue 9
Displaying 1-50 of 60 articles from this issue
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Masayoshi Tajiri, Youichi Murakami1989 Volume 58 Issue 9 Pages 3029-3032
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSN-periodic soliton solutions that consist of N sequences of the algebraic localized solitons in arbitrary directions are presented to the Kadomtsev-Petviashvili equation with positive dispersion using the bilinear transformation method. The existence conditions and some properties of them are also given.View full abstractDownload PDF (456K) -
Takehiko Oguchi, Hidetsugu Kitatani1989 Volume 58 Issue 9 Pages 3033-3036
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe specific heats at the critical temperatures of the dual lattice of the Ising model on a square lattice were calculated by the canonical series of cluster approximations. Then the specific heats of the original lattice were calculated through the dual transformation. Finally the critical exponent α′ below the transition temperature was determined as α′=0 by the coherent-anomaly method.View full abstractDownload PDF (476K) -
Shigeru Odaka, Takahiko Kondo, Koya Abe, Katsuya Amako, Yasuo Arai, Yu ...1989 Volume 58 Issue 9 Pages 3037-3041
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA possible contribution of neutral scalar bosons to the cross section of multihadron production at e+e− collisions was examined at center-of-mass energies between 55.0 and 60.8 GeV by taking into account first-order radiative corrections. We found no positive evidence and established new upper limits on the coupling parameter of the scalars.View full abstractDownload PDF (728K) -
Keiji Matsuo, Yukinari Homan, Katsunori Muraoka, Masanori Akazaki, Shi ...1989 Volume 58 Issue 9 Pages 3042-3045
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElectron density fluctuations in Heliotron E were measured using the Fraunhofer-diffraction method of a CO2 laser radiation. The deduced dispersion relation was found to be consistent with the drift wave, Doppler-shifted by a poloidal rotation resulting from a radial electric field. The measured intensities of the fluctuations were used to estimate the diffusion coefficient and particle confinement time, the latter (10 ms) being the same order of magnitude as that obtained independently from laser fluorescence and plasma emission, both at the Balmer alpha line.View full abstractDownload PDF (496K) -
Masaru Aniya, Hideo Okazaki, Michisuke Kobayashi1989 Volume 58 Issue 9 Pages 3046-3048
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA new approach to interpret the origin of the ultrasonic attenuation in superionic conductors is proposed. On the basis of experimental evidence such as the structural analysis and the molecular dynamics results, it is suggested that the sound attenuation due to mobile ions can be evaluated through the formalism of the liquid theory.View full abstractDownload PDF (392K) -
Shuji Ogata, Setsuo Ichimaru1989 Volume 58 Issue 9 Pages 3049-3052
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe report the first microscopic observation by Monte Carlo simulation (N=1458) of how the particle correlations and bond-orientational orders develop in supercooled one-component plasmas at the freezing transitions. It is found that a formation of particle layers expedites a subsequent evolution into a metastable state and that the final states have bcc-crystalline layered structures with an admixture of a few intralayer interstitials.View full abstractDownload PDF (680K) -
Yoshihiro Yamada, Yasukage Oda, Naoki Kawaji, Hideki Yamagata, Kunisuk ...1989 Volume 58 Issue 9 Pages 3053-3056
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe dc magnetic susceptibility of YBa2(Cu1−xMx)3Oy with M=Fe and Co (x<0.08) annealed in high-pressure oxygen gas was measured in the normal state. The annealing was done in flowing oxygen gas of about 6 kg/cm2 for 24 hours at low temperatures (350–450°C) after an ordinary annealing in air. Although the O2 annealing markedly enhances the superconducting transition temperature, the measured susceptibilities of Fe and Co substituents were essentially unchanged. The dc magnetic susceptibilities of the air- and O2-annealed samples with Ni (x<0.08) were also measured and found to be the same. In this compound, the Ni atom was found to have a magnetic moment close to that of the Ni2+ ion (S=1, Peff=2.83 μB).View full abstractDownload PDF (556K) -
Kazuyoshi Yoshimura, Takashi Imai, Tadashi Shimizu, Yutaka Ueda, Koji ...1989 Volume 58 Issue 9 Pages 3057-3060
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSNuclear magnetic/quadrupole resonance (NMR/NQR) has been observed for the Cu nuclei in La2−xSrxCuO4. NMR measurements have been carried out for the powdered sample whose c axes are aligned. No evidence for magnetic ordering was observed down to 1.3 K. Instead, the existence of two sets of 63⁄65Cu resonances due to nonequivalent Cu sites has been concluded from the results of spectrum and relaxation measurements at low temperatures. These resonances are ascribed to the effect of the charge differentiation introduced by the substitution of Sr for La.View full abstractDownload PDF (596K) -
Takashi Sakuma, Kaoru Shibata1989 Volume 58 Issue 9 Pages 3061-3064
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNeutron inelastic scattering of solid electrolyte β-Cu2Se was measured by the time-of-flight (TOF) method at room temperature. Low-lying dispersionless excitations near hω∼3.4 meV, which would be common to copper ion conductors, existed in the β-phase. This result was compared with those of the excitations in other solid electrolytes.View full abstractDownload PDF (540K) -
Akira Onuki1989 Volume 58 Issue 9 Pages 3065-3068
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe introduce a Ginzburg-Landau model for solid solutions to examine elastic effects near the phase separation. As a first application the spinodal curve is calculated when the elastic moduli depend on the concentration and an external stress is applied. The instability is triggered by fluctuations with wave vectors in particular directions. This indicates the morphology of emerging domains.View full abstractDownload PDF (416K) -
Akira Onuki1989 Volume 58 Issue 9 Pages 3069-3072
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe calculate an effective free energy for a concentration field by eliminating elastic fields which are coherently induced by concentration inhomogeneities. We obtain long-range interactions for solids generally under external stress when the elastic moduli weakly depend on c. They radically influence the domain morphology in late stages of the phase separation process.View full abstractDownload PDF (512K) -
Tatsuoki Takeda, Tomonori Takizuka1989 Volume 58 Issue 9 Pages 3073-3076
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWith respect to cold fusion, a fractofusion mechanism is investigated. Deuterons are accelerated by the electric field generated between crack surfaces in a crystal. By assuming the possible magnitude of the potential difference, we calculate the fusion rate and energy multiplication factor. The results are consistent with those of the cold fusion experiments, and the fractofusion mechanism can explain the cold fusion phenomena successfully.View full abstractDownload PDF (548K) -
Michiaki Matsukawa, Shinsuke Watanabe, Hiroshi Tanaca1989 Volume 58 Issue 9 Pages 3077-3080
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA two-dimensional generalization of the higher order approximation in the reductive perturbation method is investigated. The fluid equations for plasma are adopted as the model equations in the two-dimensional space. It is found that the technique of renormalization is applicable to the two-dimensional system such as the fluid equations for plasma.View full abstractDownload PDF (388K) -
Michiaki Matsukawa, Shinsuke Watanabe, Hiroshi Tanaca1989 Volume 58 Issue 9 Pages 3081-3084
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe higher order approximation for the two-dimensional nonlinear LC circuit equation is studied by the Hirota method. It is found that the Hirota method is effective not only for the completely integrable and weakly perturbed systems but also for the higher order approximation.View full abstractDownload PDF (360K) -
Hidenori Takahashi, Kimiaki Konno1989 Volume 58 Issue 9 Pages 3085-3088
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe consider initial value problems for the modified Korteweg-de Vries equation by using the inverse scattering method. We find that simple initial potentials produce a double pole and breather solutions as well as soliton solutions. We observe a soliton which connects distantly two isolated potentials.View full abstractDownload PDF (368K) -
Nobuhiko Saitô, Yasushi Matsunaga1989 Volume 58 Issue 9 Pages 3089-3105
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInadequacy of perturbation treatment in chaotic dynamics is pointed out, especially for phase space distribution function. The coarse graining is introduced into phase space distribution function for describing macroscopic thermodynamic process as a necessary and inevitable procedure for the transition from microscopic to macroscopic levels. A concept of convergence in law is employed for coarse graining. Thus a new approach to the linear response theory is presented, which can remove the various difficulties in the conventional linear response theory. The derivation of the distribution function in the sense of convergence in law is left open, but it is expected that the principal results such as fluctuation-dissipation theorem, Kubo formula for kinetic coefficient remain valid, provided that an appropriate interpretation is applied. Furthermore the entropy is shown to increase and the susceptibility derived in this theory is adiabatic susceptibility expected as a thermodynamic process. The present formulation will provide an answer to the critical discussion by van Kampen.View full abstractDownload PDF (1448K) -
Tsuyoshi Horiguchi1989 Volume 58 Issue 9 Pages 3106-3110
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe propose an exactly soluble Ising model with two kinds of exchange integrals on a square lattice. We assume that the number of bonds on which the exchange integrals take a value is even around each elementary plaquette; we name such a plaquette an even-bonds plaquette. We find two phase transition temperatures in the Ising model. We have a magnetic phase transition at one of them and a phase transition relating to the ordering of a dual spins introduced by a dual transformation of bond variables at the other. The latter phase transition is investigated in detail and turned out to have a relation with the confinement of odd-bonds plaquettes in a generalized system. Both phase transitions are of Onsager type.View full abstractDownload PDF (592K) -
Junji Suzuki1989 Volume 58 Issue 9 Pages 3111-3122
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSome thermodynamic quantities in the N state vertex model (the SAA model) are obtained. It is shown that the surface tension and the correlation length are the same as those of the six-vertex model. The mean square height difference ⟨h2⟩ between the central site and perimeter sites is also calculated. It turns out that the usual fluctuation theory does not give the correct relation between ⟨h2⟩ and the correlation length.View full abstractDownload PDF (1128K) -
Naoki Kawashima, Masuo Suzuki1989 Volume 58 Issue 9 Pages 3123-3130
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe super-effective-field theory (SEFT) proposed by one of the present authors (M.S.) is applied to the antiferromagnetic planar model on a two-dimensional triangular lattice (AFPT model) in order to understand the nature of chiral order by a series of mean-field-type approximations. Approximants are constructed for clusters of various sizes up to 651 sites and calculated by use of the Monte Carlo technique. The critical temperature Tc and the exponent γ are estimated as Tc=0.5096(5) and γ=1.7(2) respectively. Some of characteristic features of this model such as the relation between the KT-like and Ising-like transitions are discussed from a viewpoint of the present theory.View full abstractDownload PDF (868K) -
Tôru Sakai, Minoru Takahashi1989 Volume 58 Issue 9 Pages 3131-3142
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe investigate the Heisenberg antiferromagnets on the square lattice with different coupling constants in two directions of bonds such that the ratio is J(=J⊥⁄J⁄⁄). For S=1⁄2 and S=1, we estimate the critical value Jc such that Néel order exists for Jc<J≤1, while not for 0≤J<Jc. The results of the spin wave theory suggest that Jc is very small (Jc<10−1) and a disordered phase exists only in quasi-one-dimensional regions. Then we treat interchain couplings as a mean field. By this approximation Jc is derived from Jc=(2χst)−1 where χst is the staggered susceptibility of a chain. We estimate χst for finite chains by the exact diagonalization of the hamiltonian and extrapolate to infinite systems. Our estimations are Jc=0 for S=1⁄2 and Jc≥0.025 for S=1.View full abstractDownload PDF (1176K) -
Hideki Iimura, Takeshi Seo, Shigeru Yamada1989 Volume 58 Issue 9 Pages 3143-3150
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSGamma-gamma angular correlations on 20 cascades in the decay of 12 min 151Nd have been measured. The spins of levels at 426.4, 507.9, 524.3, 532.0, 840.9 and 1133.1 keV in 151Pm have been uniquely determined to be 1/2, 5/2, 3/2, 7/2, 3/2 and 5/2, respectively. The E2/M1 mixing ratios of 6 transitions have been derived. The obtained results have been discussed on the basis of the rotation-vibration coupling model.View full abstractDownload PDF (780K) -
Ichiro Yamada, Atsunori Danjo, Takato Hirayama, Atsushi Matsumoto, Shu ...1989 Volume 58 Issue 9 Pages 3151-3156
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe crossed ion-and-electron-beams technique has been used to measure the absolute cross sections for single ionization of F+, Ne+, Cl+ and Ar+ ions by electron impact, over the electron energy range from below threshold up to 1000 eV. For F+ and Cl+ ions, the present experiment has provided the first absolute ionization cross sections. The measured cross sections for F+ and Ne+ ions are well reproduced with the semiempirical Lotz formula over the energy range investigated. The results for Cl+ and Ar+ ions show more rapid rise from the threshold than the prediction of the Lotz formula, indicating the contribution of excitation-autoionization processes, and tend to be in good agreement with the Lotz formula at higher energies.View full abstractDownload PDF (660K) -
Yuji Nakamura, Katsuji Ichiguchi, Masahiro Wakatani, John L. Johnson1989 Volume 58 Issue 9 Pages 3157-3174
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTwo-dimensional MHD equilibrium and stability codes based on the stellarator expansion provide a good description of the properties of three-dimensional stellarator configurations. Improvements and extensions of the two-dimensional stellarator expansion of such codes with a particular emphasis on the STEP code are discussed. Three-dimensional equilibria of the ATF Torsatron at zero and finite beta are given. The relation between the Mercier stability criterion and low-n stability limit with respect to pressure driven modes is clarified, where n is a toroidal mode number. Whenever DI\gtrsim0.2, the STEP code predicts global unstable modes numerically, where DI is the Mercier parameter whose shear stabilization term is normalized as −1⁄4. The second stability regime is realized by controlling the magnetic axis position by the vertical field in an l=2 and M=12 torsatron/heliotron configuration, where l is a pole number and M is a helical period number of the magnetic field.View full abstractDownload PDF (1932K) -
Hironobu Kasano, Hiroyuki Mashiyama1989 Volume 58 Issue 9 Pages 3175-3181
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe crystal structure of [N(CH3)4]2NiCl4 was investigated at 23°C in phase I (normal phase), at −5°C in phase III (commensurate phase) and at −60°C in phase IV (normal phase) by means of X-ray diffraction. The least-squares calculations converged at R=0.043 for phase I, at R=0.047 for phase III and at R=0.036 for phase IV, respectively. It was revealed that each tetrahedral ion is in disorder in phase I. In phase III, the position of each molecule almost coincides with one of two disordered sites in phase I. It was confirmed in phase IV that the rotating direction of each molecule about the axis parallel to the b-axis is in-phase and the rotation angle of NiCl42− tetrahedron is about two times larger than that in phase I.View full abstractDownload PDF (832K) -
Yasuo Saruyama1989 Volume 58 Issue 9 Pages 3182-3197
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMinimum potential structure composed of helical polymer molecules is studied. The intramolecular potential and the intermolecular potential between the nearest neighbor molecules are taken into account. Attending to the geometric symmetry of the system general features of the minimum potential structure is investigated. The process to build up the bulk structure from a couple of molecules which are of the minimum potential packing is given in detail. Unperiodic structures as well as periodic structures are found to be the minimum potential structures. Crystallographic space groups of the periodic structures are given. Some periodic structures belong to lower symmetry systems than their lattices.View full abstractDownload PDF (1820K) -
Yukio Shibata, Kimihiro Ishi, Toshiaki Ohsaka1989 Volume 58 Issue 9 Pages 3198-3203
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe lattice dynamics of molecular crystal CS2 is studied within the rigid molecule and harmonic approximations, on the basis of Kihara core potential. Frequencies of lattice vibrations, dispersion curves, density of states and heat capacity at low temperatures are calculated. The results are in good agreement with experimental data and also compared with previous calculations. A role of nonaxisymmetric short-range interactions is discussed.View full abstractDownload PDF (628K) -
Yoshie Matsuo, Kaori Miyata1989 Volume 58 Issue 9 Pages 3204-3211
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSX-ray diffuse scattering measurements have been carried out on β-phase Au-47.5 at%Cd-0.75 at%Cu and Au-49.0 at%Cd-0.75 at%Cu alloys. Five notable features were found in the distribution of diffuse scattering: (i) diffuse sheets extending uniformly parallel to the (111) planes, (ii) diffuse streaks running through the fundamental reflection points in the [1\bar10] directions, (iii) diffuse peaks near q=(1⁄3)[110] along the [1\bar10] direction, (iv) diffuse peaks near q=(1⁄3)[112] along the [11\bar2] direction and (v) diffuse peaks near q=(3⁄4)[110] along the [110] direction. The intensity of these five kinds of anomalous diffuse scattering shows characteristic temperature dependence. The diffuse scattering is discussed in relation to the mechanism of martensitic transformation.View full abstractDownload PDF (940K) -
Norimichi Kojyo, Yositaka Onodera1989 Volume 58 Issue 9 Pages 3212-3218
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTo understand the role of hydrogens in the ferroelectricity of hydrogen-bonded crystals, the effect of deuteration in the mixed crystal Cs(H1−xDx)2PO4 is studied on the basis of the coupled proton-dipole model presented by the present authors (J. Phys. Soc. Jpn. 57 (1988) 4391) for pure CsH2PO4 and CsD2PO4. The model is essentially reduced to a one-dimensional Ising system with random bonds, and the static dielectric constant is analytically obtained in the paraelectric phase. Variation of the ferroelectric phase transition temperature with deuteration, TC(x), is calculated. The result predicts that the TC(x) curve of Cs(H1−xDx)2PO4, which has not yet been determined by experiments, should have a large bowing because of the quasi-one-dimensionality of the system.View full abstractDownload PDF (856K) -
Ryuzo Abe, Tomonari Dotera1989 Volume 58 Issue 9 Pages 3219-3226
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSHigh temperature expansion for ln Z (Z: the partition function in the absence of magnetic field) of the Ising model on the Penrose lattice is discussed. The terms up to the order of w8 are derived. To illustrate an extrapolation procedure employed here, the critical compressibility factor Zc and the correlation function C at Tc for the neighboring spin pair are first treated in the case of two-dimensional square lattice. It turns out that the terms up to w8 for ln Z lead to the results within the error of 0.2∼0.3% as compared to exact values. Along the same line, Zc and \barC (average correlation function) are calculated for the Penrose lattice. The final results are Zc=0.138±0.002 and \barC=0.673±0.003.View full abstractDownload PDF (896K) -
Yositaka Onodera, Norimichi Kojyo1989 Volume 58 Issue 9 Pages 3227-3235
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMotivated by Tokunaga’s proposal that ratio of the paraelectric dipole moment μc to the saturation dipole moment μs is correlated with whether a ferroelectric substance belongs to the displacive or order-disorder type, we calculated the two dipole moments for the classical coupled an harmonic-oscillator model in the independent-site approximation. It is found that μc⁄μs\gtrapprox1 in the displacive type and μc⁄μs≈1 in the order-disorder type. Thus, the ratio indeed has some correlation with the types of ferroelectric phase transitions, but its magnitude alone is insufficient in discriminating the two types. In addition, our theory predicts a certain relation between μc⁄μs and the discontinuity of the specific heal at Tc, which BaTiO3 is shown to satisfy strikingly well.View full abstractDownload PDF (988K) -
Riki Kawashima1989 Volume 58 Issue 9 Pages 3236-3242
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe AC conductivities have been measured in the frequency range from 3 Hz to 100 kHz at temperatures in the phases II and I along the b-axis of CsNO3 crystal to study the dynamical properties near the structural phase transition point Ttr. The frequency dependence of conductivities varies at Ttr. The spectra of conductivities on the complex conductivity plane show polydispersive relaxation processes in both the phases. The conductivities for the b-axis of the crystal have been compared with those for the c-axis. The effective relaxation time τ(T) can be evaluated from the experimental results and described by activation type in phase I. The behavior of τ(T) shows a stepwise change near Ttr.View full abstractDownload PDF (604K) -
Tomio Iwasaki, Toshio Soda1989 Volume 58 Issue 9 Pages 3243-3250
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe develop the Green function theory for the high-field phase of the bcc solid 3He. We adopt decoupling procedures, which do not contradict the spin wave theory at temperatures near T=0. The magnetization is determined by solving two self-consistent equations and we obtain the H-T phase diagram. According to our results, the bcc 3He has only one first-order transition above the low-field phase.View full abstractDownload PDF (724K) -
Ryoichi Suzuki, Makoto Osawa, Shoichiro Tanigawa, Makoto Matsumoto, No ...1989 Volume 58 Issue 9 Pages 3251-3263
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe three dimensional electron-positron momentum densities have been obtained on Ti and Zr from measurements of two dimensional angular correlation of positron annihilation radiation followed by an image reconstruction technique based on direct Fourier transformation. Augmented-plane wave band structure calculations have been carried out and the results are compared with the experiments. Agreement between the experiment and the theory leads to a conclusion that both Ti and Zr have electron surface sheets which are centered at H and hole surface sheets which are running along the Γ-A axis.View full abstractDownload PDF (1680K) -
Yoshihiro Asai1989 Volume 58 Issue 9 Pages 3264-3269
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCarrier locations of hole-doped and electron-doped high-Tc copper oxides in their ground states were determined by quantum chemical calculations. We have used a cluster surrounded by point charges. The used point charge arrangement produces a potential which simulates the functional form of the Madelung potential completely. Our calculation includes electronic correlations especially of on-site Coulomb repulsion of the Cu atom, which is the most important near the half-filling of the ground state. The doped hole will occupy the oxygen 2pπ band. The doped electron will occupy the Cu 4s band. In the hole-doped and the electron-doped copper oxide, a moment on the Cu3dx2−y2 orbital will remain.View full abstractDownload PDF (812K) -
Nobuhiko Sakai, Nobuhiro Shiotani, Fumitake Itoh, Ou Mao, Masahisa Ito ...1989 Volume 58 Issue 9 Pages 3270-3279
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCompton profiles of silicon along the [100] and [110] axes have been measured with a recently developed spectrometer having a momentum resolution of 0.084 atomic units. The following subjects are discussed using the observed profiles: (1) valence electron profiles, (2) directional anisotropy of the profile, (3) comparison with the angular correlation of positron-annihilation radiation, (4) evaluation of the Lock-Crisp-West theory, and (5) the auto correlation function. The high resolution in momentum makes it possible to evaluate theoretical calculations precisely. It is shown that the theoretical calculation based on the tight binding model describes the momentum distribution of silicon fairly well.View full abstractDownload PDF (1124K) -
Naoshi Suzuki, Takahiro Yamasaki, Kazuko Motizuki1989 Volume 58 Issue 9 Pages 3280-3289
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSystematic APW band calculations are carried out for the non-magnetic states of intercalation compounds M1⁄3, TiS2 (M=Mn, Fe, Co, Ni), and differences and similarities of the electronic band structures for different intercalant M atoms are clarified. The results obtained explain various physical properties observed for M1⁄3TiS2. Calculations of the bond orders are also carried out in order to elucidate the bonding nature of M atoms in the intercalation compounds.View full abstractDownload PDF (1140K) -
Nobuhisa Fujima, Tsuyoshi Yamaguchi1989 Volume 58 Issue 9 Pages 3290-3297
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetism and electronic structure of NiN clusters are calculated by the spin-polarized DV–Xα–LCAO method for N=4, 6, 8, 13, 14 and 19. The valence 3d electrons are localized within the atoms of the clusters and separated from the 4s valence electrons which extend over the whole cluster. The 4s electronic states well correspond to those of the shell model. Since the highest occupied molecular orbital is within the 3d band, there exist 3d holes. Physically, the number is 2 for 4<N<8, 8 for 8≤N≤18, and 18 for N=19 and 20. This results in the stepwise change of magnitude of the total spin as a function of N. This 3d magnetic anomaly is closely related to the 4s shell structure and expected to appear in a series of transition-metal clusters. This anomaly is different from the so-called Kubo effect of fine particles of simple metals.View full abstractDownload PDF (776K) -
Susumu Misawa1989 Volume 58 Issue 9 Pages 3298-3303
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Hubbard model is examined in the strong correlation limit within the framework of the Hubbard-I-type simple-decoupling method of the Green’s functions. The decouplings are made with the projection operators. The transition temperature Tc of the s- and d-wave superconductivity due to the superexchange interaction is calculated as a function of the hole concentration δ. The resultant Tc becomes zero as δ→0 and δ→1, and can have appreciable values in some regions of δ. The d-wave superconductivity is favorable when δ∼1⁄3, while s-wave state is favorable in other regions.View full abstractDownload PDF (668K) -
Kenji Yonemitsu, Yasushi Wada1989 Volume 58 Issue 9 Pages 3304-3323
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of anisotropy is studied for superconductivity due to electron-phonon coupling. Parameters in the model are so determined that they can reproduce the results of band calculations and the phonon dispersion relations of La2−xSrxCuO4. The electron-phonon coupling strength and the dopant concentration are varied over a wide range. We first calculate the phonon polarization part and then solve numerically the Eliashberg-Nambu equation which includes anisotropies of Fermi surface, the phonons, and the coupling. It turns out that the electron-phonon coupling is less anisotropic than the electronic density of states, even when the Fermi surface is close to the van Hove singularity. The superconducting transition temperature is predominantly determined by the averaged electron-phonon coupling over the Fermi surface. As carrier concentration changes and the Fermi surface crosses the configuration with the van Hove singularity, the transition temperature is expected to have a cusp.View full abstractDownload PDF (1956K) -
Hiroyuki Oyanagi, Yoshikazu Nishihara, Keizo Murata, Hirotaka Yamaguch ...1989 Volume 58 Issue 9 Pages 3324-3327
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe effect of hole doping on the electron states at the copper sites in La2−xSrxCuO4−y (0.0<x<0.25) has been studied by the X-ray absorption near-edge structure on the Cu K-edge. We find that the absorption edge shifts to a higher energy with the increase of Sr concentration x and saturates at x=0.20, coinciding with x having the maximum value of Tc. The observed systematic edge shift indicates that doping influences the electron states on the copper sites either directly, by the formation of the Cu d hole (d8 configuration) or indirectly, through the distortion of the CuO6 unit.View full abstractDownload PDF (540K) -
Shunya Abe, Hiromi Nakazawa, Takejiro Kaneko, Hajime Yoshida, Kazuo Ka ...1989 Volume 58 Issue 9 Pages 3328-3333
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurements on the magnetic properties of the intermetallic compounds RCu4Pd (R=Gd, Tb, Dy, Ho and Er) with a cubic crystal structure are carried out in the temperature range from 4.2 to 300 K under magnetic fields up to 150 kOe. All the compounds are found to be ferromagnetic. Temperature variations of the susceptibilities follow the Curie-Weiss law in higher temperature. The paramagnetic Curie temperature for each compound is in good agreement with the Curie temperature. The effective magnetic moment per R ion coincides well with that derived from the free R3+ ion. The results are discussed in terms of the RKKY theory.View full abstractDownload PDF (596K) -
Tosizumi Aoki1989 Volume 58 Issue 9 Pages 3334-3338
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFrom the point of view of the quantum lattice liquid, an attempt is made to understand the one-dimensional S=1⁄2 Heisenberg antiferromagnet. Without assuming a long-range order, the spin wave excitation is approximately derived from the motion of a number operator (z-component spin). With the aid of a sum rule, the spectrum is estimated. The Boson representation of the system is approximately given on the basis of the equation of motion of the number operator. In this framework, the susceptibility, the specific heat and the correlation function are calculated. The results imply the possibility of a quantum lattice liquid description of the system.View full abstractDownload PDF (536K) -
Yoshitami Ajiro, Hiroki Yamazaki, Kenji Kawaguchi, Nobuyoshi Hosoito, ...1989 Volume 58 Issue 9 Pages 3339-3346
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFerromagnetic resonance (FMR) of multilayered metallic films synthesized from an insoluble combination of Fe and Mg is studied in a temperature range from 10 K to 300 K. A well defined FMR signal is observed in each sample with Fe thickness ranging from 4 Å to 30 Å. The observed spectra are found to be strongly dependent on the regularity of the layered structure. The resonance field exhibits an unusual shift which changes systematically as a function of the thickness as well as temperature. The origin of the shift of the resonance field is discussed in relation to the amorphous-like structure observed for the thickness less than 12 Å.View full abstractDownload PDF (832K) -
Atsunobu Nakamura, Norio Kawakami, Ayao Okiji1989 Volume 58 Issue 9 Pages 3347-3354
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ultrasonic attenuation coefficient and the elastic constant are investigated for the heavy-fermion system UPt3. The effects of the antiferromagnetic spin fluctuation are taken into consideration by means of the hydrodynamic theory. It is shown that the spin thermal fluctuation gives rise to the peak structure for the attenuation coefficient near the temperature characteristic of the antiferromagnetic spin fluctuation. Furthermore, it is expected that the elastic constant has a dip structure in the same temperature regime due to the same origin. The above results are qualitatively in agreement with the experimental findings for UPt3.View full abstractDownload PDF (924K) -
Fumihiro Matsukura, Y\={u}ichi Tazuke, Tomonao Miyadai1989 Volume 58 Issue 9 Pages 3355-3360
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFor Ising spin glasses FexTiS2 (x=0.05, 0.1, 0.2), to investigate the temperature dependence of the relaxation time, ac-susceptibility measurements are made. Frequency dependences of spin glass transition temperatures defined by the maximum of the ac-susceptibility are analyzed by four conventional equations. The appropriate equation for x=0.05 and x=0.1 is the power law (for finite T*). For x=0.1 it seems that the Fulcher law also describes the data. The appropriate equation for x=0.2 is the Fulcher law. The results of the analyses suggest the existence of clusters of Fe-spins for high-Fe concentrations.View full abstractDownload PDF (612K) -
Kazuyoshi Takeda, Hiroyuki Deguchi, Takahiro Hoshiko, Kensuke Konishi, ...1989 Volume 58 Issue 9 Pages 3361-3370
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetic and thermal properties have been studied on two kinds of organic free radicals, TANOL(2,2,6,6-tetramethyl-4-piperidinol-1-oxyl) and TPV(1,3,5-triphenylverdazyl), where the unpaired electrons are localized on the NO bond in the former compound but delocalized on the larger molecular orbitals in the latter. TANOL has been confirmed magnetically as a typical one-dimensional Heisenberg system with localized quantum spins coupled with the exchange constant J⁄kB=−5.2 K. On the other hand, the experimental results on TPV can not reasonably be understood on the basis of a localized model with the possible paths of magnetic interactions such as a railroad trestle lattice. It is suggested that organic free radicals offer promising real systems for getting essential physical phenomena which can check model Hamiltonians for a delocalized and frustrated quantum system.View full abstractDownload PDF (1180K) -
Mihoko Yoshida, Kazuo Morigaki1989 Volume 58 Issue 9 Pages 3371-3382
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTriplet exciton states in a-Si:H, a-Si,C:H and a-Si,N:H were investigated by the steady-state and time-resolved optically detected magnetic resonance techniques. The existence of triplet exciton states in a-Si:H and a-Si,N:H materials was confirmed, for the first time from these measurements. The extent of the electron orbitals in the triplet exciton state and its averaged lifetime in these materials were estimated to be ∼10 A and ∼1 ms, respectively. A singlet-triplet exciton splitting energy in a-Si:H was also estimated to be ∼0.15 eV. An impurity-related center and a self-trapped exciton center are considered as the origin for the triplet exciton centers in these materials.View full abstractDownload PDF (1464K) -
Hidehiko Wakabayashi, Tsuneaki Goto, Kazuaki Fukamichi, Hiroyuki Komat ...1989 Volume 58 Issue 9 Pages 3383-3391
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMössbauer spectra have been measured for two Fe-rich amorphous alloys, a-Fe91.5La8.5 with spin glass behavior and a-Fe82.5La17.5 with reentrant spin glass behavior, in the temperature range between 4.2 K and room temperature. These spectra are analyzed using the Hesse and Rubertsch method to obtain the distribution of hyperfine fields. The distribution of hyperfine fields at 4.2 K consists of a main component ranging from 200 kOe to 400 kOe and a sub-component around 150 kOe. The average Fe-moment is estimated to be 1.96μB for a-Fe91.5La8.5 and 2.00μB for a-Fe82.5La17.5. Hyperfine fields in a-Fe91.5La8.5 appear progressively below 150 K, which is apparently higher than the spin glass temperature of 124 K determined by the ac susceptibility measurement. On the other hand, hyperfine fields in a-Fe82.5La17.5 appear just below the ferromagnetic ordering temperature of 267.5 K, but increase anomalously below 70 K. This anomaly can be explained in terms of the freezing of transverse components of spins.View full abstractDownload PDF (964K) -
M. A. Gaffar, G. F. Al-Noaimi, A. Abu El-Fadl1989 Volume 58 Issue 9 Pages 3392-3400
Published: September 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric permittivity, ε22, spontaneous polarization, Ps, and coercive field, Ec, of triglycine sulphate (TGS) crystals doped with d-l alanine, orthonitroaniline, paranitroaniline or aniline molecules have been measured from room temperature up to the transition point. A remarkable displacement of the hysteresis loops of polarization along the direction of the field axis and a broadened transition from the polar to the non-polar phase are detected. An increase in the value of Ps and a decrease of both ε22 and Ec are also observed. The changes in both ε22 and Ps attributed to the creation by the dopants of an internal electric field, Eb. The internal bias affects the Curie constant and εmax in a way similar to that introduced by an external bias. The value of Eb in the vicinity of the phase transition and the parameters of the statistical dipolar theory of ferroelectricity have been calculated.View full abstractDownload PDF (1004K) -
Haruhiko Suzuki, Fuminao Shimizu, Toshihisa Yamaguchi, Masaaki Takashi ...1989 Volume 58 Issue 9 Pages 3401-3405
Published: September 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSingle crystals of ferroelectric K2CoCl4 have been obtained by the Bridgman method and the dielectric, thermal and dilatometric properties have been investigated. The phase-transition sequence of this crystal was confirmed to be analogous to that of other Rb2ZnCl4-group ferroelectrics.View full abstractDownload PDF (524K)