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Toshiyuki Ninomiya
1979 Volume 47 Issue 3 Pages
1011-1012
Published: September 15, 1979
Released on J-STAGE: June 01, 2007
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Kazuyoshi Takeda, Tomoyuki Koike, Takashi Tonegawa
1979 Volume 47 Issue 3 Pages
1013-1014
Published: September 15, 1979
Released on J-STAGE: May 29, 2007
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The magnetic phase diagram of the most typical quasi-one-dimensional antiferromagnet (CH
3)
4NMnCl
3(
TN=0.835 K) has been established. An anisotropic axis has been found in the hexagonal plane perpendicular to
c-axis. When the magnetic field
H is applied along the easy axis in the plane, the Néel temperature
TN(
H) shifts down to the bicritical point at (
Tb=0.5 K,
Hb=11.4 kG) on the (
T-
H) diagram, and for
H>
Hb,
TN(
H) turns to increase monotonously.
TN(
H) for the hard axis shows an anomalous increase as has been reported experimentally and theoretically for quasi-one-dimensional antiferromagnets.
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Kiichi Okuda, Hiroshi Mollymoto, Muneyuki Date
1979 Volume 47 Issue 3 Pages
1015-1016
Published: September 15, 1979
Released on J-STAGE: May 29, 2007
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High field magnetization process was studied on disordered Ni
1−XMn
X alloys (
X=0∼0.30) at 4.2 K using a pulsed magnetic field up to 400 kOe. A large induced magnetization was observed near the concentration
X=0.25, where the spontaneous magnetization disappears. The experimental results support the presence of antiferromagnetic Mn atoms weakly coupled with host magnetic moments in the alloys.
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Tetsuo Ikari, Yutaka Koga
1979 Volume 47 Issue 3 Pages
1017-1018
Published: September 15, 1979
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Optical absorption edge spectrum of γ-InSe single crystals has been investigated. The experimental results show that the fundamental absorption edge is well interpreted by the transition to the two-dimensional indirect exciton state, where only a single phonon participates.
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Shin-ichi Hirako, Ryumyo Onaka
1979 Volume 47 Issue 3 Pages
1019-1020
Published: September 15, 1979
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Optical absorption spectra of LiCl and LiBr single crystals containing Cu
2+, Ni
2+, Co
2+, Fe
2+ or Mn
2+ have been studied in the range of 20.0 to 52.0 kcm
−1. Several absorption bands of medium intensity are observed and found to be temperature insensitive. These absorption bands are assigned to the electron transfer transitions from halogen ions to the central metal ions in MeX
6 complexes. Splitting of the absorption bands is observed in LiBr, which is interpreted as caused by the spin-orbit interaction in Br
− ions.
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J. C. Machado da Silva, A. S. Chaves, R. Gazzinelli, G. M. Ribeiro, R. ...
1979 Volume 47 Issue 3 Pages
1021-1022
Published: September 15, 1979
Released on J-STAGE: May 29, 2007
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Electron paramagnetic resonance spectra of the SeO
2− centers in KD
3(SeO
3)
2 demonstrate that the phase transition in this system is associated with an ordering of the O–H(2)– –O hydrogens and a small rotation of the SeO
3 groups around the
a-axis with the angle of rotation being proportional to the order parameter. The ferroelastic transition is thus triggered by a soft optic deuteron-lattice mode of B
3g symmetry inducing the acoustic C
44 instability.
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Ikuo Suzuki, Kenkichi Okada
1979 Volume 47 Issue 3 Pages
1023-1024
Published: September 15, 1979
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An additional phase transition in Cu(HCOO)
2·4H
2O has been found at −46°C below the well-known antiferroelectric transition at −38°C. A distinct anomaly in pyroelectric current was observed at the new transition. Ferrielectric triple loop was obtained along
b axis in the low temperature phase. Respective temperatures are shifted to higher temperature by 10°C for Cu(HCOO)
2·4D
2O. Though the net polarization is small and the phase is approximately antiferroelectric, the phase below −46°C is ferrielectric.
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N. D. Sharma, F. A. Kasir
1979 Volume 47 Issue 3 Pages
1025-1026
Published: September 15, 1979
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A simple method for calculating the cation migration energies for cesium chloride type crystals from the known experimental parameters; stiffness constants and cation migration volume are suggested. The results are in good agreement with the experimental values and also support other theoretical estimates.
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Motoji Ikeya
1979 Volume 47 Issue 3 Pages
1027-1028
Published: September 15, 1979
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Chemical etching of an aromatic hydrocarbon crystal of fluorene γ-irradiated heavily indicates the presence of voids presumably filled with hydrogen molecules. The pressure inside the voids is estimated to be around a few tens of the atmospheric pressure.
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Yoshio Kaneko, Tadaoki Mitani, Takao Koda
1979 Volume 47 Issue 3 Pages
1029-1030
Published: September 15, 1979
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The reflection spectra are observed on (Eu, Sr)S single crystals obtained by using an arc-image furnace. Of the five reflection anomalies, the lower three structures are assigned to the
X-point excitons, and the upper doublet to the
Γ-point exciton.
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Tetsuo Koizumi, Nobuo Kobayashi, Yozaburo Kaneko
1979 Volume 47 Issue 3 Pages
1031-1032
Published: September 15, 1979
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Mobility of Ar
+ ions in He gas was studied at 82 K. An injected-ion drift tube mass spectrometer, the drift tube of which can be cooled with liquid nitrogen was developed for this purpose. The mobility curve obtained has a bump at the intermediate
E⁄
N, and the zero-field reduced mobility has approached to the polarization limit. The peculiarities of ionic mobility in He gas are explained.
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Yoshio Matsuura, Kuniya Fukuda
1979 Volume 47 Issue 3 Pages
1033-1034
Published: September 15, 1979
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The structure of the He
2 600 Å emission continuum has been investigated in He glow discharges using photon counting technique in the wavelength region from 700 to 900 Å, and three peaks have been newly observed. Comparison with calculation indicates that Sando’s potentials of
A1Σu+ and
X1Σg+ states reproduce the observed structure very well also in this region. As for the ground state
X1Σg+, its validity has been confirmed in the energy range from 3 to 7 eV.
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Toshinori Michishita, Hideki Zushi, Sadao Masamune, Hidetoshi Suemitsu ...
1979 Volume 47 Issue 3 Pages
1035-1036
Published: September 15, 1979
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Non-thermal microwave radiation from a tokamak NOVA
Π operated in a runaway mode exhibited two distinct time behaviors at X-band synchronized with the positive spikes in loop voltage, depending on the vertical magnetic field. One can be explained by synchrotron radiation through the pitch angle scattering of the runaways. The other is closely related with the ratio ω
ce⁄ω
pe.
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Shin’ichi Oishi
1979 Volume 47 Issue 3 Pages
1037-1038
Published: September 15, 1979
Released on J-STAGE: June 01, 2007
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Recently, it is shown that for a number of soliton equations, their solutions expressing multiple solitons in a background of ripples, which may be called generalized soliton solutions, can be constructed using Hirota’s bilinear forms of these soliton equations (S. OISHI: submitted to J. Phy. Soc. Jpn.). In this letter, taking the KdV equation as an example, relationship between Hirota’s method and the inverse spectral method is clarified by showing that its generalized soliton solutions can be transformed into a form of Fredholm’s determinants of the Gel’fand-Levitan-Marcenko integral equation.
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