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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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Volume 54, Issue 9
Displaying 51-67 of 67 articles from this issue
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Hidetoshi Hiroyoshi, Kou Noguchi, Kazuaki Fukamichi, Yasuaki Nakagawa1985 Volume 54 Issue 9 Pages 3554-3561
Published: September 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetization in high magnetic fields, thermomagnetization curves at low fields, hysteresis loops after field cooling and magnetic after-effect in the initial magnetization region have been investigated for Fe–Hf amorphous alloys containing 7.5–39 at.%Hf. The present results indicate the mictomagnetism or the Fe-rich alloys and the normal ferromagnetism of the alloys containing above 20 at.%Hf. The magnetic after-effect in the mictomagnetic alloys is explained on the basis of the thermal fluctuation theory using a domain wall pinning model.View full abstractDownload PDF (964K) -
Yoshichika \={O}nuki, Yohichi Machii, Yoshiaki Shimizu, Takemi Komatsu ...1985 Volume 54 Issue 9 Pages 3562-3566
Published: September 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have measured the electrical resistivity, specific heat, magnetoresistance, magnetic susceptibility and magnetization of CeCu2 single crystal in the temperature region of 1.4 K to room temperature. CeCu2 is found to be a so-called dense Kondo substance with a large specific heat coefficient of 180 mJ/mole·K2 around 10 K. The magnetic susceptibility and the negative magnetoresistance are extremely anisotropic, reflecting the orthorhombic crystal structure. The antiferromagnetic ordering is suggested below 3.0 K.View full abstractDownload PDF (540K) -
Triple-Q and Single-Q States in Antiferromagnetic fcc Transition Metals with the First-Kind OrderingKunitomo Hirai, Takeo Jo1985 Volume 54 Issue 9 Pages 3567-3570
Published: September 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy using a real space expansion approach to calculate the Green function of d-electrons, the four-spin interaction is derived and the relative stability among various multiple spin density wave states is discussed for antiferromagnetic fcc transition metals with the first-kind ordering. The transition from a triple-Q state to a single-Q state is shown to occur with increasing or decreasing the number of d-electrons from the nearly half-filled band region.View full abstractDownload PDF (556K) -
Isao Yamada, Koji Ubukoshi, Kinshiro Hirakawa1985 Volume 54 Issue 9 Pages 3571-3576
Published: September 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRecent experimental studies on NaTiO2 and LiNiO2 suggest that they might be rare compounds of 2D triangular lattice antiferromagnet with S=1⁄2, the former being Heisenberg-like and the latter being Ising-like. We have studied ESR from 1.5 K to 300 K. In NaTiO2 a broad ESR signal was observed at 300 K. A sharp ESR signal grows below ∼250 K and continues to increase the intensity toward 0 K. In LiNiO2, we found clear dip in resonance width at 210 K corresponding to the para- to ferrimagnet-like transition but no change in resonance field on passing through it. Contrary to this, a remarkable divergence of the width was found at ∼19 K and a shift of resonance field starts below it, though no magnetic order has been detected by neutron scattering. Possible origin of these phenomena is discussed.View full abstractDownload PDF (808K) -
Masanori Arakawa, Hiroshi Ebisu, Hideo Takeuchi1985 Volume 54 Issue 9 Pages 3577-3583
Published: September 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEPR measurements on Gd3+ centres in KCdF3, RbCdF3, RbCaF3, CsCdF3 and CsCaF3 for crystals co-doped with Li+ ions have been made in the cubic phase of host crystals. In all the crystals spectra for Gd3+ centres associated with both cation vacancy (VM) and Li+ ion at the nearest divalent cation site have been observed. The observed parameters b20 and b44 in the spin Hamiltonian show various dependences on lattice constant in the series of fluorides with the same divalent (Cd2+ or Ca2+) or the same monovalent (Cs+ or Rb+) cation. The differences of the magnitude of b20 and b44 for Gd3+–Li+ centre from that for Gd3+–VM centre in the same host crystal are discussed.View full abstractDownload PDF (892K) -
Toshikazu Hirose, Masaru Kawaminami, Masanori Arakawa1985 Volume 54 Issue 9 Pages 3584-3590
Published: September 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe EPR spectra from V4+ ions in WO3 single crystal were studied in the temperature range from 300 K to 77 K by using a K-band spectrometer. At 77 K, the g values and hf parameters A of V4+ ions were strong c-axis anistropy, so that gX=1.928, gY=1.945, gZ=1.815, (Eulerian angles; θg=3.9°, φg=45.8°, ψg=−0.2°), and AX=−60.5 G, AY=−55.0 G, AZ=−190.4 G, (θA=4.4°, φA=43.6°, ψA=1.5°). The ground state of 3d1 electron of V4+ ion was determined to be |xy⟩ state by hf structure analysis. WO3 is determined to be a ferroelectric material with the spontaneous polarization along the c-axis connected to the condensed ferroelectric Γ15z phonon modes of W6+ ions in the monoclinic II phase at 77 K. At the relations of gav vs Aiso for V4+ and VO2+ ions in some host crystals, WO3 is shown to be a remarkable material.View full abstractDownload PDF (892K) -
Youichi Ohno, Shun-ichi Nakai1985 Volume 54 Issue 9 Pages 3591-3596
Published: September 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe L2,3 absorption spectra of the metal ions in layered 3d transition-metal thiophosphates MPS3 (M=Mn, Fe, Ni) have been measured. Results are discussed by comparing with the spectra of other transition-metal compounds and with the theoretical calculation by Gupta and Sen. The spectra are interpreted in terms of the multiplet structure which results from the interaction between a 2p hole and 3d electrons of a localized metal ion. Since the p-d interaction is reduced by the delocalization of metal 3d orbitals, the multiplet structure becomes inconspicuous as covalency is increased. It is concluded that the near-edge structure of the metal L2,3 absorption spectrum of an ionic 3d transition-metal compound exhibits the multiplet structure, while that of a covalent compound represents the projected density of states of the conduction band.View full abstractDownload PDF (848K) -
Eiji Kato, Teruo Komatsu, Yozo Kaifu1985 Volume 54 Issue 9 Pages 3597-3604
Published: September 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe elastic constants of BiI3, and SbI3 are determined by Brillouin scattering. It is found that the phase velocity of phonons propagating in an angle Ψ to the Z-axis is different from that propagating in an angle 180°-Ψ for rhombohedral crystals. The elastic constants determined in units of 1011 dyne/cm2 are C11=2.9, C12=0.50, C13=0.90, |C14|=0.20, |C25|=0, C33=2.6 and C44=0.70 at 83 K for BiI3, and C11=1.5, C12=−0.50, C13=0.40, |C14|=0.10, |C25|=0.25, C33=0.93 and C44=0.47 at room temperature for SbI3. BiI3 and SbI3 show very low elastic anisotropy compared with other layered crystals. The phonon dispersion curves calculated by a one-dimensional chain model does not show a satisifactory agreement with the dispersion obtained from the present work.View full abstractDownload PDF (984K) -
Hiroyasu Nakata, Eizo Otsuka1985 Volume 54 Issue 9 Pages 3605-3614
Published: September 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFormation and decay kinetics of a bound exciton and a bound-double-exciton complex in zinc doped germanium are investigated by examining the dependence of photoluminescence intensity on excitation intensity and by time resolved photoluminescence measurement. Exciton capture cross section by a neutral acceptor is found to be 4.7×10−16 cm2 and the lifetime of the bound exciton 1.8 μs at 4.2 K. The stable closed hole shell structure of the bound-double-exciton complex is responsible for its long lifetime 2.1 μs and such a large capture cross section as 1.1×10−14 cm2 of exciton capture by a bound exciton. The electron capture process by an A+ related complex is proposed for the formation of a bound exciton at low excitation. One can explain the broadness of the bound exciton line in terms of a displacement of Zn impurity from the center of the substitutional site in the exciton capture process.View full abstractDownload PDF (1360K) -
Kazuo Saitoh1985 Volume 54 Issue 9 Pages 3615-3621
Published: September 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy tracing the ion density distribution in transverse phase space, planar channeling at small depth is investigated in detail. Damping of surface oscillations of nuclear encounter probability, as a consequence of motion of ions which do not reach equilibrium, is shown to be caused mainly by diffusion in transverse momentum. Depth evolution of phase space ion density is presented schematically and several quantities characterizing the equalization process are evaluated. The rate of approach to statistical equilibrium is obtained as a function of transverse energy. It is shown that well channeled ions which have oscillation amplitudes of about a quarter of the interplanar spacing are the hardest to reach equilibrium.View full abstractDownload PDF (1068K) -
Eiji Hashimoto, Takeshi Shiraishi, Takao Kino1985 Volume 54 Issue 9 Pages 3622-3627
Published: September 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDoppler-broadened lineshapes of positron annihilation radiation in an aluminum single crystal after quenching have been measured as a function of temperature between 4.2 and 200 K. The peak parameter for positron annihilation in the trapped state at vacancies showed no significant temperature dependence below 80 K, while above 100 K, it showed an almost linear temperature dependence with a temperature coefficient about twice that found for positron annihilation in the free state. A low concentration of vacancies yielded a remarkable increase in the peak parameter as the temperature decreased below 80 K. The results showed a strong temperature dependence of the trapping rate of positrons at vacancies in the low temperature range.View full abstractDownload PDF (796K) -
Mihiro Yanagihara, Hideki Maezawa, Taizo Sasaki, Yasuo Iguchi1985 Volume 54 Issue 9 Pages 3628-3631
Published: September 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSK+L2,3 absorption spectra at room temperature have been measured for KF, KCl, KBr and KI. Tentative assignment for the spectra is made using the ligand field model.View full abstractDownload PDF (420K) -
Masatoshi Tanaka, Susumu Kurita, Masami Fujisawa, Setsuko Matsumoto1985 Volume 54 Issue 9 Pages 3632-3637
Published: September 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSReflectance spectra of single crystals of [Pt(en)2][Pt(en)2I2](ClO4)4 and [Pt(en)2][Pt(en)2Cl2](ClO4)4 have been measured in the vacuum ultraviolet region up to 25 eV, with synchrotron radiation. Halogen ion-dependent structures observed below 10 eV are ascribed to the transitions related to the valence bands originating from p orbitals of halogens. The one-dimensional band structures for the two compounds are determined from these spectral structures and their polarization-dependences, with the aid of the tight-binding approximation.View full abstractDownload PDF (820K) -
Akito Kakizaki, Tatsuya Miya, Kenzo Naito, Isao Fukui, Hidenao Sugawar ...1985 Volume 54 Issue 9 Pages 3638-3646
Published: September 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSResonant photoemission in the bromides of Ni, Co, Fe and Mn has been observed for excitations near the 3p thresholds of the metal ions. Resonance occurs all over the valence band spectra including satellites, and the resonance excitation spectra are similar to those observed in the chlorides. Some features in the main bands shift toward high-binding-energy side upon resonance. This shift gives rise to increase in the crystal field splitting on resonance for NiBr2, FeBr2 and MnBr2, but decrease for CoBr2; Racah parameters increase on resonance in all the bromides observed here.View full abstractDownload PDF (1136K) -
Takashi Sakuma, Shoji Saitoh1985 Volume 54 Issue 9 Pages 3647-3648
Published: September 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (216K) -
Nobuyoshi Yamada, Tetuo Ohoyama, Hideki Miyajima, Yoshichika Otani1985 Volume 54 Issue 9 Pages 3649-3650
Published: September 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (252K) -
Kiyomitsu Suzuki1985 Volume 54 Issue 9 Pages 3651
Published: September 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (24K)