Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 55, Issue 6
Displaying 1-44 of 44 articles from this issue
  • Kin’ya Takahashi
    1986 Volume 55 Issue 6 Pages 1783-1786
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Husimi functions for eigen states around a hyperbolic point are studied. Husimi functions for eigen states of wave forms with even and odd parity are strictly concerned with the hyperbolic point and the separatrix in classical limit (h→0), respectively. It is interesting that classical behavior is affected by quantum symmetry.
    Download PDF (308K)
  • Yoshifumi Kimura
    1986 Volume 55 Issue 6 Pages 1787-1790
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Some transport properties of a vortex-soliton; a kink type motion of a thin vortex filament enlightened by Hasimoto, are studied. Especially, the virtual momentum and the virtual angular momentum are investigated. It is found that finite amount of these quantities are transferred, whose values depend on two constants that characterize the shape of the kink; the torsion and the maximum curvature, in the same direction with the soliton.
    Download PDF (292K)
  • Susumu Saito, Shuhei Ohnishi, Chikatoshi Satoko, Satoru Sugano
    1986 Volume 55 Issue 6 Pages 1791-1794
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Stable structures of the Si6 and the Si10 microclusters have been calculated using LCAO-Xα-force method. The calculated structures of the Si6 and the Si10 clusters resemble a regular octahedron and a tetrahedron, respectively. In both clusters, triangles constituted of the (111)-surface atoms of the crystalline silicon contract by 20% in length compared to those of the crystal. This contraction is attributed to the interaction between dangling bonds and important for silicon microclusters of any size.
    Download PDF (500K)
  • Keiichi N. Ishihara, Paul H. Shingu
    1986 Volume 55 Issue 6 Pages 1795-1798
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The structure factors of 3-dimensional (3D) Penrose tiling when the atoms are positioned at the center of edge, face and body of the unit cells are presented. The summary of the calculations for these atomic arrangements revealed that the vanishing rule of 6D crystal structure is roughly held for the reciprocal lattice of 3D Penrose tiling. The multiplicity factor for each quasi-lattice plane diffraction is calculated and the powder diffraction patterns for these models are simulated.
    Download PDF (376K)
  • Kazushige Machida, Mitsutaka Fujita
    1986 Volume 55 Issue 6 Pages 1799-1801
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Vibrational properties in one-dimensional quasi-lattices constructed by the Fibonacci substitution rule are studied numerically within a harmonic approximation. Examining the generation dependence of the substitution, we find that the gross spectrum structure is generation-independent and self-similar, and that the ratio of the numbers of the eigenfrequencies contained in each band tends to the golden mean with the generation. The localization property of the eigenfunctions and other class of the quasi-lattice are discussed.
    Download PDF (340K)
  • Hikaru Kawamura, Masaharu Tanemura
    1986 Volume 55 Issue 6 Pages 1802-1805
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    A Monte Carlo study is made on the two-dimensional ±J plane-rotator (XY) model on the square lattice in the ferromagnet-rich region. Reentrance phenomena are observed with the intermediate quasi-ferromagnetic and the low-temperature chiral spin glass states. It is found that the reentrant spin glass state is characterized with the existence of frozen-in vortices.
    Download PDF (536K)
  • Shûji Sudo, Takashi Nishioka, Yoshihito Miyako, Tomonao Miyadai
    1986 Volume 55 Issue 6 Pages 1806-1809
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    We prepared a highly homogeneous polycrystal sample of NiS1.48Se0.52 in a sense that it undergoes, with increasing temperature, a sharp transition from metal to insulator (M–I) at 38.2 K in the antiferromagnetic phase (TN∼65 K). The specific heat was measured on a sintered sample from 4.2 to 70 K. The obtained coefficient of the linear electronic specific heat, γ, is as large as 33 mJ/K2 mole, and the Debye temperature determined below 20 K is 375 K. Such a large value of γ suggests a strong enhancement due to electron correlations. A clear latent heat of 38 J/mole was observed at the M–I transition. The corresponding entropy change is 1 J/K mole, probably mainly electronic. The magnetic specific heat was also observed and the magnetic entropy was estimated at 1.7 J/K mole. The present results support that the M–I transition in NiS1.48Se0.52 is the Mott transition.
    Download PDF (544K)
  • Kaoru Kimura, Tatsuo Hashimoto, Shin Takeuchi
    1986 Volume 55 Issue 6 Pages 1810-1813
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The temperature dependence of electrical resistivity and the effect of magnetic field on it have been measured in a quasicrystalline Al79.5Mn20.5 alloy of almost single phase. This phase has large resistivity (∼800 μΩcm) and a small negative temperature coefficient above 30 K like high-resistive amorphous metals, though the crystallized phase has a positive coefficient like usual metals. Below 30 K, the resistivity of the quasicrystalline phase increases rapidly with decreasing temperature, exhibiting exact logarithmic temperature dependence from 1 K to 15 K. The resistivity increases with increasing magnetic field (≤140 kG) in this temperature range, and the origin of the logarithmic temperature dependence is not considered to be the ordinary Kondo effect. Some discussion is made by comparing the present results with those of amorphous metals.
    Download PDF (516K)
  • Hidetoshi Fukuyama, Sadamichi Maekawa
    1986 Volume 55 Issue 6 Pages 1814-1817
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Interaction effects associated with Anderson localization have been examined for proximity effects in two-dimensional systems relevant to the three-terminal Josephson junction devices recently realized. In the leading order of logarithmic singularity for the case of dynamically screened Coulomb interaction it is shown that both coherence length and overall amplitude of Cooper pair wave function are reduced.
    Download PDF (496K)
  • Yoshichika \={O}nuki, Katsuyoshi Ina, Munekazu Nishihara, Takemi Komat ...
    1986 Volume 55 Issue 6 Pages 1818-1821
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    We have found metamagnetic behavior of orthorhombic single crystals NdCu6. Magnetization curve in the field along the b-axis shows four steps, whereas that along the c-axis suggests a canted spin structure. These results suggest the existence of four canted sublattices.
    Download PDF (372K)
  • Toshirou Yagi
    1986 Volume 55 Issue 6 Pages 1822-1825
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The deuterated dicalcium strontium propionate crystal (DDSP) was synthesized in order to investigate the role of motion of propionate ions in the phase transition of the ferroelectric dicalcium strontium propionate (DSP). The temperature dependence of the dielectric constant εc at 1 kHz shows an anomaly at 279.5 K (TC) indicating a negligibly small isotope effect on TC. The temperature dependence is well described by the Curie-Weiss law εc−ε0=C(TTC)−1 with ε0=3.7 and C=56.2 K above TC. The ferroelectricity of DDSP was confirmed by the observation of the dielectric hysteresis loop below TC. The negligibly small isotope effect on TC suggests a secondary role of the motion of the propionate ions in the mechanism of the ferroelectric phase transition of DSP.
    Download PDF (568K)
  • Noriko Saitoh, Éi Iti Takizawa
    1986 Volume 55 Issue 6 Pages 1827-1835
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A new kind of Bäcklund transformation of the two-(space)-dimensional Toda lattice (2DTL) is given in the axially symmetric case. The compatibility conditions for the 2DTL equation lead to the new Bäcklund transformation (BT) of the 2DTL equation. By means of the BT, several solutions of the 2DTL equation are systematically obtained, starting from the solutions of the 2DTL equation itself.
    Download PDF (848K)
  • Ryoichi Kikuchi, Hitoshi Kokubun, Shigetoshi Katsura
    1986 Volume 55 Issue 6 Pages 1836-1845
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The Ising model on the triangular lattice with antiferromagnetic nearest-neighbor and ferromagnetic second neighbor interactions is treated using the cluster variation method with a hexagon of seven spins as the basic cluster. The para, the partial disordered (PD), the two sublattice ferri and the three-sublattice ferri phases and their boundaries are derived. The results are examined varying temperature, magnetization and the magnetic field, and are compared with the previous work by Kaburagi, Tonegawa and Kanamori. The trend is noticed that the PD phase shrinks as the approximation is improved.
    Download PDF (860K)
  • Mizuhiko Saeki
    1986 Volume 55 Issue 6 Pages 1846-1860
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Time-convolutionless forms of the quantal master equations for driven open system are derived from the Liouville equation for the total system under an arbitrary initial condition for the two cases of weak external driving fields and of arbitrary ones. They have forms convenient for the perturbational expansions, and are respectively compared with the time-convolution forms of equations in the lowest Born approximation for the interaction (Remark: Graphics omitted.) of the system with its surroundings. It is shown that the time-convolutionless forms of equations prevail over the time-convolution ones, and that the conventional Markoffian approximation for the latter in the narrowing limit leads to the incorrect conclusion. The time-convolutionless form of master equation is expanded up to n-th order in powers of the external driving fields in the lowest Born approximation for (Remark: Graphics omitted.).
    Download PDF (1356K)
  • Mizuhiko Saeki
    1986 Volume 55 Issue 6 Pages 1861-1872
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The time-convolutionless master equation for driven open system derived in a previous paper, is applied to a simple system of a driven quantal oscillator. This system is assumed to be interacting weakly with its surroundings (heat bath). The operator form of equation is transcribed into the c-number one by the phase-space method. The equations of motion for the expectation values of the boson operator and boson number operator are derived from the c-number equations and are solved for the case of a non-adiabatic oscillator-bath interaction. The results are compared with the ones in the conventional Markoffian approximation for the time-convolution equation in the narrowing limit.
    Download PDF (1019K)
  • Motoyuki Tanaka, Takeshi Kawabe
    1986 Volume 55 Issue 6 Pages 1873-1879
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A spin-one Ising model previously proposed for an adsorbed monolayer is investigated using a Monte Carlo method for the case of the strong biquadratic nearest-neighbour interaction. It is shown that there exist then two kinds of intermediate phases in addition to two ordered phases which were found in the model with weak biquadratic nearest-neighbour interaction. A phase diagram obtained from the MC data is presented with inclusion of phase boundaries characterizing the existing phase transitions. We show then that the intermediate phases are also predicted from a mean-field theory based on the four-sublattice model, the results of which are compared with the MC results. The conditions for the appearance of one of the intermediate phases are discussed using this mean-field theory.
    Download PDF (780K)
  • Yasuhiro Akutsu, Atsuo Kuniba, Miki Wadati
    1986 Volume 55 Issue 6 Pages 1880-1886
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    An infinite series of exactly solvable multi-state IRF models is constructed. Each model in the new hierarchy is the special S2-generalization, proposed in the previous paper II, of the corresponding model in the ‘eight-vertex SOS’ hierarchy. The Boltzmann weights and their parametrizations are given with a detailed proof that they satisfy the star-triangle equation.
    Download PDF (676K)
  • Natsuki Hashitsume, Michiyo Mori, Tomoko Takahashi
    1986 Volume 55 Issue 6 Pages 1887-1893
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A new derivation of the Langevin equation for a system in contact with a heat reservoir in equilibrium is given based on the concept of path probability inherent in the Feynman approach to quantum mechanics. The derived Langevin equation is a generalization of the Magalinski type, i.e., it is a second order differential equation and contains a shift term, a retarded damping term, a destruction term and a random force term in addition to the usual external potential force term. It is a semi-classical equation in the sense that it is a classical equation but contains a quantal response function of the Kubo formula type and the second moment of the random force is given by a quantal symmetrized correlation function. The fluctuation-dissipation theorem of the second kind is exactly valid between the response and the correlation functions.
    Download PDF (748K)
  • Youichi Murakami
    1986 Volume 55 Issue 6 Pages 1894-1903
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Resonant interaction between a finite-amplitude marginally unstable mode and two neutral modes is investigated in a system consisting of two semi-infinite inviscid incompressible fluids moving with uniform velocities parallel to their interface at the critical velocity difference. By employing a multiple scaling method, coupled equations are obtained governing the temporal evolution of the amplitudes and phases of the triad.
    Download PDF (1104K)
  • Yutaka Shimomura, Akira Yoshizawa
    1986 Volume 55 Issue 6 Pages 1904-1917
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Reynolds stress in a rotating system is statistically calculated up to the first order of the scale and rotation parameters by using the two-scale direct-interaction approximation. The results obtained show that the effects of rotation give rise to the anisotropy not only of turbulent energy but also of turbulent viscosity. This fact is incorporated into a Smagorinsky-type subgrid model in the large-eddy simulation of turbulence in a rotating system.
    Download PDF (1336K)
  • Shobu Kaneko, Atsushi Kamitani
    1986 Volume 55 Issue 6 Pages 1918-1924
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The MHD equilibrium configurations of spheromak plasmas in an oblate spheroidal flux conserver are determined for a pressure distribution whose derivative dp⁄dΨ vanishes on the magnetic axis, and for an optimized distribution which is neutrally stable for localized perturbations. Here Ψ is the flux function. These equilibria are shown to be stable for symmetric modes. The stability for localized modes is investigated by the Mercier criterion. The values of the maximum beta ratio βmax are evaluated for both pressure distributions and are shown to become about 1.5 times larger by optimization. The beta ratio is defined by the value of 2pB\varphi2 on the magnetic axis, where B\varphi is the toroidal magnetic field. If the condition, qaxis<1, is required, the values of βmax are found to be less than 23%. Here qaxis is the value of the safety factor on the magnetic axis.
    Download PDF (800K)
  • Zensho Yoshida, Nobuyuki Inoue
    1986 Volume 55 Issue 6 Pages 1925-1930
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A mathematical method to analyze the decay of a dissipative dynamical system is developed, which is to study the dissipative structure of the corresponding system. The method is applied to the study of stable equilibria in magnetohydrodynamic (MHD) systems. Special sets of MHD equilibria are characterized as attractors of MHD systems, and they are shown to be classified into four classes, which cover wide range of experimentally observed MHD equilibria.
    Download PDF (864K)
  • Yasutomo Ohguchi, Tetsuro Murakami
    1986 Volume 55 Issue 6 Pages 1931-1935
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The nonequilibrium behavior of induction argon plasmas at a pressure 1.0 atm is studied by means of a two-temperature model. The results are compared with Stokes’ experiments and with the LTE plasmas. The agreement with the experiments is well improved compared with the agreement using the LTE theory. The electron temperature has an off-axial peak in the profile and deviates considerably from the heavy gas temperature in the outer region. On the other hand, the temperature difference between them in the central region is fairly small even for relatively low axial temperatures. Although for a low power discharge the gas temperature decreases monotonically toward the wall, it drops but is slightly higher than the electron temperature in the central region, when the discharge power increases.
    Download PDF (528K)
  • Isao Miyake
    1986 Volume 55 Issue 6 Pages 1936-1942
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    On KCl crystals annealed in chlorine gas, the internal friction was measured as a function of strain amplitude by the Marx’s method. The experimental results were analysed by the Granato-Lücke model of vibrating dislocations. It was found that the internal friction is remarkably decreased with X-irradiation. It was indicated that chlorine molecular ions introduced in crystals by the annealing were changed to pinning elements on the dislocations with the X-irradiation. With repeated measurements in the range exceeded the break points, the internal friction irreversibly increased. The fact was interpreted by vanishing of the pinning elements with breakaway of the dislocations from them. The pinning element was supposed to be chlorine molecule ion Cl2 captured on dislocation.
    Download PDF (784K)
  • Kêitsiro Aizu
    1986 Volume 55 Issue 6 Pages 1943-1947
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A previous paper [J. Phys. Soc. Jpn. 54 (1985) 4213] indicated the possibility of a transition from an incommensurate phase having constant phase differences to an incommensurate phase having varying phase differences. Following that paper, this paper indicates that the latter phase, viz., the incommensurate phase of the varying phase difference type should be ferroelectric. Since this phase is not semicommensurate, it is a new type of simultaneously incommensurate and ferroelectric phase. Its polar direction agrees with the incommensurate direction and hence differs from the polar direction of the corresponding commensurate ferroelectric phase. The expressions of the temperature dependences of spontaneous polarization and susceptibility are deduced.
    Download PDF (512K)
  • Yutaka Ishihara, Yasushi Yoshita, Ichiroh Nakada
    1986 Volume 55 Issue 6 Pages 1948-1951
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The specific heat of GeTe was measured by the relaxation-time method between 2 and 10 K for single crystals of mass 20∼40 mg. The Debye temperature ΘD(0) at 0 K was estimated to be 147 K. However, an anomalous excess specific heat near 3 K previously reported was not confirmed. From the electronic specific heat and the carrier concentration, the density-of-states effective mass was obtained to be 0.77m0.
    Download PDF (472K)
  • Minoru Takahashi
    1986 Volume 55 Issue 6 Pages 1952-1960
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The effective potential method is proposed in the path integral Monte Carlo calculation for many-body system interacting with two-body potential. This method is formulated for bosons, fermions and distinguishable particles. There are three types of effective potentials in accordance with statistics of particles. This is applied to liquid 4He at the density 0.03626 mol/cm3 and λ transition is reproduced in path-integral Monte Carlo calculation. Calculated energy coincides with thermodynamic data of 4He within the error of 1.0 K per atom.
    Download PDF (796K)
  • Nobuhiro Shiotani, Christine R. Bull, Roy N. West, Nobuo Kawamiya, Yas ...
    1986 Volume 55 Issue 6 Pages 1961-1970
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    After confirming by magnetization measurements that a Ni3Ga single crystal is purely paramagnetic, the two dimensional electron-positron momentum density is measured and subsequently the LCW folded density is constructed. A comparison of the experimental results with complementary independent particle model calculations by APW method leads to a qualitative discussion of electron-positron many-body correlation effects in this system in which the character and the density of the valence electrons differ significantly for each cell of the constituent elements.
    Download PDF (1548K)
  • Shigenori Hayashi, Keiichi Kaneto, Katsumi Yoshino, Rokuji Matsushita, ...
    1986 Volume 55 Issue 6 Pages 1971-1980
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Dependences of electrical conductivity and ESR of iodine-doped polythiophene films, (C4H2SIy)x, on iodine concentrations which are precisely determined by a neutron activation technique (from a dilute level of y∼4×10−4 to a deep level of y∼4×10−1) are reported. A drastic increase of conductivity from 10−8 to 10−2 S/cm is observed at the fairly narrow dopant concentration region of 2×10−3<y<5×10−3, accompanied by a remarkable decrease in the activation energy of conductivity. At this transitional region, the ESR signal also changes significantly, showing a maximum spin density and a minimum linewidth. These results are discussed to understand the semiconductor-to-metal transition in iodine-doped polythiophene, taking polaron and bipolaron models into account.
    Download PDF (1240K)
  • Hiromi Noto
    1986 Volume 55 Issue 6 Pages 1981-1986
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The characteristic collective excitation modes of a multicomponent plasma (n-component) in a magnetic field are investigated in a long wavelength. It is shown that there exist (n−1) characteristic magnetic fields (H0,1H0,n−1) at which the charge-density waves propagate for an arbitrary direction with the multicomponent “non-magnetic” plasma frequency \barωp . The propagation-direction dependence of (n+1) collective excitation modes and some useful relations are investigated in the long wavelength limit. The dispersion relation for the “non-magnetic” plasma mode is derived up to the order of square of the wave number in the scheme of the random phase approximation.
    Download PDF (528K)
  • Shuji Abe
    1986 Volume 55 Issue 6 Pages 1987-2001
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A model of the deformable charge density wave (CDW) coupled to impurities in three dimensions is studied with computer experiments. Low energy states of adiabatic potentials are studied for a finite system in case of moderately high concentration of impurities. Special attention is paid to the nature of collective pinning and phase slippage processes accompanying the translational motion of the CDW. It is found that the domain size of a single slippage process has a broad distribution, typically over two orders of magnitude in volume. This distribution may be responsible for the experimentally observed glassy response of the CDW. Also it is shown that because of this distribution the CDW possesses memory of internal polarization which depends on the direction of its previous motion.
    Download PDF (1760K)
  • Hiroshi Kawai, Kenji Makoshi, Akio Yoshimori
    1986 Volume 55 Issue 6 Pages 2002-2007
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The oscillatory approach in time to the equilibrium value of the spin polarization of moving atoms near metal surfaces is analyzed in detail, which appears in the Hartree-Fock approximation for the time-dependent Newns-Anderson model. The approximate asymptotic solution is obtained for the long time behavior of the spin polarization and also the detailed analytic property of the exact solution for long time is discussed.
    Download PDF (596K)
  • Y\={u}ichi Tazuke
    1986 Volume 55 Issue 6 Pages 2008-2016
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Polycrystalline samples of VxCr3−xS4 (0<x<2) are prepared and their magnetic properties are studied by magnetization and AC-susceptibility measurements. Magnetic phase diagram is determined. For 0<x<xc (slightly larger than 0.6), the compounds enter into an antiferromagnetic state at TN, and gradually enter into frozen-spin state around Tf(<TN). The compound with x=0.4 shows a symmetric hysteresis loop at 4.2 K after being cooled under magnetic field from above Tf. For xc<x<2, on the other hand, there is a sharp paramagnetic-spin glass transition at Tg. The compound with x=1.0 shows an asymmetric hysteresis loop at 4.2 K after being cooled under magnetic field from above Tg. It is suggested that the appearance of the asymmetric loop depends on a long-distance correlation between the spins, which is realized for x=1.0 as a result of the thermodynamical phase transition at Tg.
    Download PDF (1032K)
  • Takeo Jo, Kunitomo Hirai
    1986 Volume 55 Issue 6 Pages 2017-2023
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The relation between tetragonal lattice distortion observed in Mn-rich γMn alloys such as MnNi, MnFe and MnCu and their magnetic structures is investigated on the basis of the Landau expansion of free energy. By taking into account a coupling between lattice distortions and three magnetic order parameters specifying the first-kind antiferromagnetic ordering on the fcc lattice, possible phase diagrams in the temperature-composition plane are discussed. Observed various types of phase diagram for lattice distortion including the orthorhombic phase in γMnNi alloys are shown to be well explained and the type of multiple spin density wave state for each phase is predicted.
    Download PDF (892K)
  • Miki Yamada, Minoru Takahashi
    1986 Volume 55 Issue 6 Pages 2024-2036
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A linear chain of S=1⁄2 spins with the isotropic Hamiltonian (Remark: Graphics omitted.), (J<0) , at low temperatures is studied numerically by solving a set of nonlinear integral equations which are derived from the Bethe Ansatz. We find that the free energy and susceptibility are both expanded in \sqrtT⁄|J| about T=0. The critical exponents are α=−1⁄2 and γ=2. The coefficient of T3⁄2 term in the free energy agrees with the spin wave theory with the accuracy of 0.1%. The coefficient of T−2 term in the zero-field susceptibility agrees with Fisher’s solution of the classical Heisenberg model with the accuracy of 0.3%. The contribution from the second and higher order terms of the expansions in these thermodynamic quantities is not negligible in the region T⁄|J|>0.002.
    Download PDF (1052K)
  • Nahonori Miyata, Tatsuo Kamimori, Mitita Goto
    1986 Volume 55 Issue 6 Pages 2037-2042
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Magnetostriction constants, λ100 and λ111, of Pd1−xFex were measured in the composition range of 0.1\lesssimx\lesssim0.6 by using a three-terminal capacitance method. Almost all specimens were quenched. Temperature was varied from 77 K to room temperature and magnetic field was applied up to 15 kOe. Composition dependence of both constants showed a minimum at x≅0.17, where an abrupt change was observed on a cubic anisotropy constant K1. In the composition range of x<0.15 λ100 and λ111 have different sign (λ100>0) with each other, while both of them are positive for x>0.2. The composition dependence of calculated mean value \barλ=(2⁄5)λ100+(3⁄5)λ111 was similar to the previous report on polycrystalline samples presented by Schmidt and Berger.
    Download PDF (600K)
  • Tetsusuke Hayashi
    1986 Volume 55 Issue 6 Pages 2043-2052
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Reflection, transmission and luminescence spectra of 4H-PbI2 thin crystals have been investigated experimentally in the direction of c-axis at 2 K. Interference structure of reflection and transmission spectra has been compared with that calculated with use of a simple dispersion relation of polaritons. An effective mass of an exciton motion is derived to be (1.0±0.2)me from analyses of the spectra in the exciton resonance region. Luminescence with a thickness dependent oscillating structure has been observed in the range of free exciton luminescence as well as of bound exciton luminescence. This is assigned to the photon emission of discrete polariton modes established inside a slab due to the interference effect. The intensity distribution of the spectra and its thickness dependence are discussed in relation with the polariton decay processes.
    Download PDF (1184K)
  • Yosuke Kayanuma, Satoshi Tanaka
    1986 Volume 55 Issue 6 Pages 2053-2063
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    It is noticed that the dipole-dipole interactions between pairs of off-center impurity ions in alkali halide crystals effectively freeze out the tunneling motions of the individual ions and this can be optically detected. The concentration dependence of the infrared absorption line shape of NaCl: OH observed by Wedding-Klein and Nanba et al. (the O–H stretching band) is explained from this point of view. The so-called B band is assigned as due to the stretching mode excitation of the frozen pairs of dipoles. A fairly good fit to the observed spectra is obtained by the virial expansion theory for the line shape function applied to the six-state hopping model with the tunneling parameter of 1 cm−1 hc and with the magnitude of the dipole moment of 3.3 Debye.
    Download PDF (1300K)
  • Eizo Otsuka, Hiroyasu Nakata, Yohei Ichikawa
    1986 Volume 55 Issue 6 Pages 2064-2069
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Reinterpretation of old cyclotron resonance results for Zn-doped Ge is made in terms of bound excitons as evidenced from photoluminescence experiments. Photoluminescence observation of the dissociation of excitons from Zn impurities on application of uniaxial stress is directly corresponding with the enhancement and narrowing of the cyclotron resonance signal obtained from the same Zn-doped Ge crystal under stress.
    Download PDF (836K)
  • Tomoki Yanagimachi, Tadayoshi Doke, Ryoji Hamasaki, Takayoshi Hayashi, ...
    1986 Volume 55 Issue 6 Pages 2070-2085
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    To measure the flux ratio of ultraheavy cosmic ray particles (UH) with Z>45 and cosmic ray Fe nuclei at a mean geomagnetic cut-off rigidity of 10 GV, detector arrays were exposed for a net total of 45.2 m2·days in two balloon flights in 1976 and 1982. The fluxes of particles with Z>45 and Fe nuclei at the top of the atmosphere are presented. From comparison between the [UH]/[Fe] ratio of these experiments and that of the others at low rigidity region, it is shown that the energy spectrum of UH is somewhat different from that of Fe in the energy range between 1–10 GeV/amu. Propagation calculations have been made to examine energy spectra of various cosmic ray particles. The results of the calculations show that the difference in the energy spectrum can be explained mainly by the energy dependent nuclear fragmentation process during the propagation of cosmic ray particles.
    Download PDF (1716K)
  • Akio Shibata, Gendo Oomi, Yoshichika \={O}nuki, Takemi Komatsubara
    1986 Volume 55 Issue 6 Pages 2086-2087
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (240K)
  • Tomohiro Shibata, Ryuji Abe, Minoru Fukui
    1986 Volume 55 Issue 6 Pages 2088-2089
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (220K)
  • Tetsuhiko Tomiki, Fujito Fukudome, Minoru Kaminao, Masami Fujisawa, Yo ...
    1986 Volume 55 Issue 6 Pages 2090-2091
    Published: June 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (268K)
  • Kyoji Yamamoto
    1986 Volume 55 Issue 6 Pages 2092
    Published: June 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (16K)
feedback
Top