Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
49 巻, 4 号
選択された号の論文の69件中1~50を表示しています
  • Takayoshi Horiguchi
    1980 年 49 巻 4 号 p. 1205-1213
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The β+ decay of 81Sr to the levels of 81Rb has been investigated with high resolution Ge(Li) detectors. The half-lives of 81Sr and 81mRb were determined to be 22.15±0.22 and 30.59±0.28 min, resrectively. Energies and relative intensities of 80 gamma rays associated with 81Sr decay were measured precisely and 30 of them are new gamma rays. The level scheme of 81Rb was constructed by applying the Ritz rule and the intensity balance. Seventy three gamma rays were incorporated into the level scheme including eleven new levels at 245.29, 463.02, 486.69, 630.58, 711.93, 923.04, 1243.64, 1513.13, 1804.41, 1848.47 and 2165.53 keV. The possible spin-parities of 81Rb levels are proposed considering logft values and gamma-ray branching ratios. The level at 245.29 keV is assigned as the anomalous 5/2+ state.
  • Ravinder Kaur, A. K. Sharma, S. S. Sooch, H. R. Verma, P. N. Trehan
    1980 年 49 巻 4 号 p. 1214-1221
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    The β decay of 76As to 76Se has been studied extensiveIy. The energies and relative intensities of 56 gamma rays have been measured with a high precision. Six new gamma rays have been observed with energies 776.5, 852.8, 857.0, 957.6, 1060.6 and 1881.3 keV in the decay of 76As. Out of these, gamma rays with 852.8, 957.6, 1060.6 and 1881.3 keV energies have been placed in the decay scheme. Gamma rays with energies 863.9 and 1564.3 keV reported earlier but not placed in the decay scheme have been confirmed and fitted in the present decay scheme. Spin assignments of 1 and 2 have been made to the levels at 2655.31 and 2669.80 keV on the basis of gamma-gamma angular correlation measurenaents. Also, the multipole admixtures in 657, 1228, 1439, 2096 and 2111 keV transitions have been evaluated.
  • S. S. Sooch, H. R. Verma, Ravinder Kaur, A. K. Sharma, Nirmal Singh, P ...
    1980 年 49 巻 4 号 p. 1222-1228
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    The level structure of 82Kr, from the decay of 35.3 h 82Br, has been investigated using a 64.1 cc Ge(Li) detector (FWHM≈2.1 keV at 1.33 MeV) in singles mode and Ge(Li)–NaI(Tl) (64.1 cc and 3″×3″ respectively) detector set-up in coincidence mode (2τ=6 nsec). These measurements confirmed the existence of 129.22, 180.5, 280.8, 332.5, 470.28, 735.7, 1 173.3, 1427.2 and 1871.7 keV weak gamma ray transitions, while the 345.65, 599.5, 625.5, 692.7, 726.8 and 932.1 keV gamma rays reported earlier, could not be observed.
    The gamma-gamma directional correlation measurements have been done on 15 cascades, out of which the 221–(606)–1044, 273–1014, 606–1044 and 221–1650 keV cascades have been attempted for the first time. Based on these measurements, the spin 3+ has been confirmed for the 2426.79 keV level in 82Kr. Also the multipole admixtures in the 221.34, 273.45, 606.30, 619.07, 698.32, 827.81, 1007.57, 1043.98, 1317.46 and 1650.28 keV gamma transitions have been evaluated.
  • M. K. Pande, C. L. Gupta, R. R. Sharma, M. N. Sharma
    1980 年 49 巻 4 号 p. 1229-1233
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The isothermal Anderson-Grüneisen parameter δT has been studied with the help of interaction approach. The necessary equation for δT has been derived interms of various lattice properties and tested for some cubic crystals, on the basis of wellknown Born, Lennard-Jones (12 : 6) and modified Varshni-Shukla potential energy functions. The potential parameters of these models have been calculated employing the lattice equilibrium conditions at hydrostatic pressure instead of the generally utilised equilibrium lattice conditions at atmospheric pressure (p=0). The results have been discussed in detail and it is inferred that the computed values of δT, except for the Lennard-Jones function, are quite satisfactory with the experimental values keeping in view the limitations involved in the present treatment, which is obviously based on the least possible approximations.
  • Fumiaki Shibata, Motoko Asou
    1980 年 49 巻 4 号 p. 1234-1241
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    A rigorous solution is obtained for the nonlinear spin relaxation process in the case of J=3⁄2. The classical versus quantum mechanical nature of the relaxation process is examined by changing the magnitude of spin, J: A simple rule is found for an asymptotic behaviour with increasing J. The combined effects of quantum mechanics and nonlinearity appear at low temperature and/or high magnetic field.
  • Masakatsu Ishikawa, Hajime Takayama
    1980 年 49 巻 4 号 p. 1242-1246
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Lieb’s type II excitation, derived exactly by means of a Bethe ansatz, in a one-dimensional Bose system with the repulsive delta-function interaction is identified with the soliton mode, which is a solution of the Pitaevskii-Gross (or nonlinear Schrödinger) equation for the corresponding Bose field.
  • Masatoshi Imada
    1980 年 49 巻 4 号 p. 1247-1254
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The linear response theory of the one dimensional nonlinear system, developed in I, is generalized to apply to a system with an arbitrary damping strength. In stead of the Smoluchowsky equation, the Fokker Planck equation is investigated. The transfer integral method is again applicable with a simple decoupling approximation. The dynamical structure factor for the φ4 chain is found to be the sum of phonon peaks and a sharp central peak. As the damping strength reduces, the phonon peak becomes underdamped, while the structure of the cetatral peak is essentially the same as the strong damping case. The origin of the central peak is due to the response of the domain wall.
  • Sumiaki Nagai, Jun Kondo
    1980 年 49 巻 4 号 p. 1255-1259
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    The one-dimensional Schrödinger equation with the Kroning-Penny potential plus the electric-field potential eFx has been solved numerically. All the interband effects are included in the exact numerical calculation. Although an infinite crystal was considered, localized wave functions have been obtaind at energies which make a Stark ladder. One Stark ladder is associated with one band. When the probability of the Zener tunneling to the next band is appreciable for given values of parameters, the wave function necessarily penetrates into the region of the next band and is not localized.
  • Seido Nagano, Setsuo Ichimaru
    1980 年 49 巻 4 号 p. 1260-1266
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The memory function for the velocity autocorrelation function in a strongly coupled, one-component plasma is analyzed in the short time and long time domains, respectively, with the aid of the frequency-moment sum rules and the hydrodynamic consideration evoking the idea of the generalized Stokes friction. A series of interpolation schemes with successively improved accuracies are then introduced. Numerical investigations of those interpolation schemes clarify the physical origin of the three different types of the velocity autocorrelation function observed in the molecular dynamics simulation at different regimes of the coupling constant.
  • Yasutami Takada
    1980 年 49 巻 4 号 p. 1267-1275
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    By solving the gap equation numerically from the first principles, we have investigated the mechanism of superconductivity in n-type seumiconducting SrTiO3. The observed transition temperature as a function of the carrier density and the applied stress is reproduced quite well, when we take account of the plasmon and the polar optic phonon which relates to the stress-induced ferroelectric transition. In the calculation, the conduction band of SrTiO3 is assumed to be the single-valley model proposed by Mattheiss and all the physical quantities such as the effective mass, the dielectric constant and the phonon dispersion relation are taken to be the values measured by experiments, so that there are no adjustable parameters in the theory. The effect of other phonons like the acoustic one is also evaluated and found to be small.
  • Susumu Chikazawa, Y. G. Yuochunas, Yoshihito Miyako
    1980 年 49 巻 4 号 p. 1276-1282
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The nonlinear susceptibilities of a spin glass compound (Ti1−xVx)2O3 (x=0.04, 0.10) have been measured by an ac mutual inductance bridge. The third and fifth nonlinear susceptibilities, which are observed as the third and fifth higher harmonics of the applied field, show the very sharp peak in the vicinity of the spin glass ordering temperature Tg, and increase logarithmically near Tg as the temperature approaches to Tg. These results are compared with the theories which indicate the cooperative freezing of spins.
  • Hajime Takeuchi, Naoshi Suzuki, Kazuko Motizuki
    1980 年 49 巻 4 号 p. 1283-1290
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Magnetic properties of an antiferromagnet KCoF3 having residual orbital moments are studied on the basis of the dynamical correlated effective field approximation developed by Suzuki. A value of the Néel temperature which shows excellent agreement with the experiment is obtained. The calculated parallel and perpendicular susceptibilities in the ordered phase and the calculated paramagnetic susceptibility are also in good agreement with the observed results with regard to both the magnitude and the temperature dependence.
  • Shigeru Tanaka, Koichi Mizushima, Shuichi Iida
    1980 年 49 巻 4 号 p. 1291-1298
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Detailed measurements of the electron spin-lattice relaxation time T1 of Fe3+ ion in rutile were carried out from 1.7 K up to 30 K by the pulse saturation recovery method. It was found that below ∼15 K the relaxation was mainly due to the direct process, while above ∼15 K the Raman process dominated. The temperature dependence of the direct relaxation rate was found to be dependent on the kind of transition. At 4.2 K, the anisotropy of the direct relaxation rate was clearly observed. In order to explain these experimental results, computation of T1 using magnetoelastic coupling tensor (G tensor), in which the elastic anisotropy of the lattice was taken into account, was carried out and the coupling of Fe3+ ion with lattice strain is discussed. For the Raman process, the relaxation rate was found to be proportional to T7 and the anisotropy of a factor of around 3 was observed.
  • Tadahiro Tawaraya, Koichi Katsumata, Hideki Yoshizawa
    1980 年 49 巻 4 号 p. 1299-1305
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Neutron diffraction experiment has been done on a randomly mixed antiferromagnet with competing spin anisotropies, Fe(1−x)CoxCl2. Front the experiment the spin structures in the three ordered phases which appear in the concentration versus transition temperature phase diagram, namely, the Fe-rich and Co-rich antiferromagnetic phases and the new phase are determined. The spin structure in the Fe-rich (Co-rich) phase is essentially identical with that of pure FeCl2 (CoCl2). In the new phase, although overall spin structure is the same as those of the pure materials, both of the two spin components are observed which are associated with competing anisotropies. The new phase is an OAF phase in the sense that an inclination of the sublattice magnetizations both from the easy axes of the pure substances means the simultaneous ordering of the spin components. The temperature dependences, of the spin components are discussed in favour of the result of the renormalization group theory.
  • Takahito Kaneyoshi, H. Beyer
    1980 年 49 巻 4 号 p. 1306-1317
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The amorphyzation of a crystalline layered ferro- and antiferromagnet with randomly distributed interlayer exchange parameters is investigated by the use of newly developed effective field theory. Two typical amorphizations of interlayer exchange parameters are studied. The phase diagrams are obtained. The analytical behaviours of magnetization near the spin glass phase boundary at T=0 are studied in details for each case. We find that the order of transition from the ferromagnetic phase to the spin glass phase depends on the distribution function of interlayer exchange parameters.
  • Nobuo Iwata, Tomoaki Matsushima, Hironobu Fujii, Tetsuhiko Okamoto
    1980 年 49 巻 4 号 p. 1318-1322
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Measurements of magnetization and susceptibility were made on the hexagonal (Cr1−xNix)2As single crystal compounds. The compounds were antiferromagnetic for 0.4<x≤0.45 and ferromagnetic for 0.45<x≤0.7. The concentration dependences of the magnetic transition temperature, the saturation magnetization and the second order anisotropy constant at 4.2 K show maxima of 188 K (Tc), 1.19 μB per formula unit and 1.46×106 erg/cm3 at x=0.5, respectively. The Curie constant is independent of x for 0.375≤x≤0.5, while it decreases with increasing x for x>0.5. The magnetization curves in the antiferromagnetic compounds at 4.2 K have relatively low critical fields. The compound of x=0.425 shows an unusual magnetization curve. The results were briefly discussed on the basis of the theory of spin fluctuations.
  • Masatsugu Suzuki, Kyoko Kato, Hironobu Ikeda
    1980 年 49 巻 4 号 p. 1323-1327
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Ultrasonic attenuation in Rb2CoF4 has been measured at frequencies ranging from 10 to 150 MHz below and above the Néel temperature TN. The critical attenuation has been separated into the relaxation and fluctuation contributions. The relaxation contribution αR takes a maximum below TN and the temperature at which the maximum appears decreases as the frequency increases. Below TN it is found that αR is described by a scaling function, αR∝ω1+y fR(ωτ′), where τ′=τ′0mtx and t=1−TTN with the results x′=1.20±0.03 and y′=0.15±0.05. The scaling function fR(ωτ′) takes such a form as 2ωτ′⁄[1+(ωτ′)2].
  • Kozo Iwauchi, Yasuo Kita, Naokazu Koizumi
    1980 年 49 巻 4 号 p. 1328-1335
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    Dielectric constant and the initial permeability of Fe3O4 have been measured from 4.2 K to room temperature. Magnetic and dielectric relaxations were observed in the temperature range of 30 to 60 K. These relaxations were considered to be caused by the transfer of electron between ferrous and ferric ions. The magnetic permeability showed a peak at the Verwey transition temperature Tv in Fe3O4 sintered samples. Magnetic loss showed an anomalous rise at Tv. The magnetization at the field of 8.3 kOe also showed a rise at Tv. This anomalous magnetic behavior is considered to be caused by the change of easy axis of magnetization at Tv.
  • Katsunori Iio, Hironobu Hyodo, Kazukiyo Nagata
    1980 年 49 巻 4 号 p. 1336-1343
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    Magnetic short-range order was observed in one-dimensional S=1 Heisenberg (CsNiCl3, RbNiCl3) and (Remark: Graphics omitted.) Ising antiferromagnet (CsCoCl3) up to kT∼10|J| and 3|J|, respectively, by measuring optical birefringences. An isomorphic diamagnet CsMgCl3 was used, with corresponding states argument, to extract the magnetic contribution Δnm from the resultant birefringence Δn in these magnetic systems. The temperature Tmax, at which the temperature derivative of the magnetic part Δnm displays a broad maximum, is in agreement with that predicted by the rigorous theory for the specific heat in each linear chain system.
  • Yoshie Matsuo, Toshiharu Suzuki, Akira Nagasawa
    1980 年 49 巻 4 号 p. 1344-1349
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    To elucidate the dynamical mechanism of the β1 to ζ transition the elastic constants of metastable β1 phase of Ag–Zn alloys containing 46.5 and 48.5 at.% Zn are measured in the range between room temperature and the β1 to ζ transition temperature using an ultrasonic pulse-echo overlapping method.
    The elastic constants CL[110]=(C11+C12+2C44)⁄2 and C44 decrease linearly with increasing temperature up to 340 K and then fall more rapidly on further heating. On the other hand, C11 decreases linearly on heating up to 340 K and then increases at higher temperatures. Furthermore, CL[111]=(C11+2C12+4C44)⁄3 which is mainly related to the β1 to ζ transition mechanism decreases rapidly above 340 K. These elastic constants show a characteristic temperature hysteresis with heating and cooling. Based on the obtained results, we discuss the transition mechanism and stability of the β1 phase.
  • Isao Nakamichi, Takao Kino
    1980 年 49 巻 4 号 p. 1350-1357
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The electrical resistivity of aluminum strips has been measured for various thickness (0.02–1.48 mm) and over a temperature (1.5–60 K). The results show the deviation from Matthiessen’s rule (DMR) Δs(T) on the surface scattering. The surface reflection parameter p is determined to be nearly zero from the temperature at which the maximum of Δs(T) appears. The DMR Δs(T) shows different profiles from DMR on the impurity scattering. The comparison of the present data with Husstad-Lothe theory shows that the effect of small angle electron-phonon scattering is small on the surface scattering. The present experiments can be explained by a term of the surface resistivity ρs(T) (=ρs(0)+Δs(T)) deduced from Fuchs-Sondheimer theory. It is thus concluded that DMR Δs(T) mainly arises from the spatial variation of the electron distribution function.
  • Tadashi Kitahara, Toshihiro Arai
    1980 年 49 巻 4 号 p. 1358-1363
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The density of upper valence band states (U-DOVS) of amorphous AsxSe100−x in the compositional region of 0≤x≤50 was investigated with ultraviolet photoelectric emission spectroscopy. The U-DOVSs in the regions of 0≤x≤40 and 40≤x≤50 are well described by U-DOVSs synthesized from those of properly weighted Se and As2Se3, and As2Se3 and As4Se4, respectively. These facts show that the hetero-bonding is predominant compared with the homo-bonding, and the dominant structure of U-DOVS is determined from the structure of the first nearest neighbour atoms.
  • Noriaki Itoh, A. M. Stoneham, A. H. Harker
    1980 年 49 巻 4 号 p. 1364-1371
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    We calculate the rates of non-radiative transitions among the excited states of the self-trapped exciton in KCl. The transition matrix elements are calculated using the same semi-empirical molecular orbital method (CNDO) as in our earlier calculations of the energy surfaces and radiolysis mechanism. The results are consistent with current experiments.
    One important result is that the non-radiative decay of the lowest electron-excited state of the self-trapped exciton proceeds more rapidly to the lowest hole-excited state than to the ground triplet state. Transfer of excitation energy from the electron to the hole (and hence the production of F and H centres) can proceed rapidly.
  • Shohei Wakita, Tsutomu Okuno, Masamitsu Hirai
    1980 年 49 巻 4 号 p. 1372-1378
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Degree of polarization of the σ and π emissions has been measured to determine the polarization of the absorption bands due to the STE in NaCl, KCl, KBr and RbBr crystals under double excitation by a pulsed electron beam and a ruby laser. (1) The lowest, (2) the second lowest and (3) the third lowest energy absorption bands in near infrared region due to the STE are (1) π-polarized, (2) σ-polarized and (3) slightly σ-polarized (1) in NaCl and KCl, (2) in KBr and (3) in RbBr, respectively. The lowest band in NaCl and KCl and the second lowest one in KBr are tentatively attributed to the transition of 3Σu+u, 1sσg)→3Πgu, 2pπu) and 3Σu+u, 1sσg)→3Σg+u, 2pσu).
  • Shigeo Kinno, Ryumyo Onaka
    1980 年 49 巻 4 号 p. 1379-1386
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    The optical properties of MgCl2 have been studied by means of reflection spectra in the region from VUV to XUV, absorption spectra in the VUV region, XPS and UPS spectra. In order to interpret the experimental results, the electronic band structure of MgCl2 has been calculated by means of the tight binding method for the core and valence band states and the plane wave method based on the empty lattice model for the conduction band states.
    The obtained band structure is found to well explain the experimental results. Therefore, it is found that the top of the valence band is composed of two almost degenerate states, i.e. Γ3 and Γ2. The polarization effect of the anisotropic crystal MgCl2 which has the CdCl2 layer type crystal structure is expected to appear at the Z points of the Brillouin zone.
  • Shigeharu Koshino, Tokiko Ohata, Tetsusuke Hayashi
    1980 年 49 巻 4 号 p. 1387-1390
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    A new absorption band has been found in RbI containing thallium of high concentration. The dependence of the luminescence intensity on the thallium concentration reveals that the new band is due to absorption by dimer (Tl+)2 centers. The analysis of the polarization of luminescence leads to the conclusion that the Tl+–Tl+ axis of a dimer center orients along a ⟨110⟩ axis of the crystal.
  • Nobuhito Ohno, Masashi Yoshida, Kaizo Nakamura, Yoshio Nakai
    1980 年 49 巻 4 号 p. 1391-1398
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Resonant Raman effect of InI is investigated at 2.2 K by tuning a cw dye laser. Scattering spectra under the resonant excitation around the first exciton band consist of Raman lines which shift with the exciting laser energy, and of ordinary luminescence bands which do not shift in photon energy. Raman lines are composed of five Raman-active lines, forbidden 1LO (13.8 meV) and its overtone (27.5 meV). Two lines (7.00 meV and 10.7 meV) of five Raman-active lines are assigned as Ag symmetry. Resonant enhancement in the scattering intensities occurs in the 1LO, the 2LO and two Ag lines of five Raman-active lines. It is confirmed that the forbidden 1LO intensity shows steep enhancement in resonance with both bound and free excitons, whereas the 2LO intensity increases more gradually as the incident photon energy approaches to the free exciton energy.
  • Minoru Fukui, Toshikazu Hirose
    1980 年 49 巻 4 号 p. 1399-1404
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The prototype structure of BaMF4 type crystal is considered to be a structure composed of slabs of the perovskite, with the space group D2h17. Normal modes at the Γ point in the orthorhombic Brillouin zone of the hypothetical D2h17 phase and the C2v12 phase below the melting point were analyzed with a help of the group theory. The condensed modes to give the crystal structure at room temperature were assigned and discussed in comparison with the Sr2Ta2O7 structure.
  • Jun Sugiyama, Mitsuo Wada, Akikatsu Sawada, Yoshihiro Ishibashi
    1980 年 49 巻 4 号 p. 1405-1412
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Successive phase transitions in {N(CH3)4}2CuCl4 single crystal were studied by the measurements of the angle between two extinction positions, thermal expansions, dielectric constants and ultrasound velocities, and also by the weissenberg photographs. It has turned out that {N(CH3)4}2CuCl4 undergoes the phase transitions successively from the prototypic phase (Pmcn), to the incommensurate phase, to the ferroelastic commensurate monoclinic phase (P121/c1) and then to another monoclinic phase (P1121/n) at T1=24°C, T2=18°C (on heating) and T3=−10°C, respectively. The phase transition sequence of {N(CH3)4}2CuCl4, including the incommensurate-commensurate (ferroelastic) transition, is discussed in terms of the Landau-type free energy.
  • Kiyohumi Takeuchi, Ryuji Abe
    1980 年 49 巻 4 号 p. 1413-1420
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    Two kinds of AsO32− radicals were found in the electron spin resonance (ESR) spectra of γ-irradiated CsH2PO4 including a small amount of AsO43−. The splitting of the spectral line below Tc represents a rotation of AsO32− radical and the temperature dependence is represented by the formula A(TcT)β with β=0.32±0.05 in the range from Tc–5° to Tc–0.7°. Meanwhile from the analysis of the ESR spectra of CsH2PO4 doped with Cr3+, it was found that the Cr3+ ion replaced Cs+ ion and two protons near the Cs+ site were vacant. Anomalous change of the breadth of the spectral line which was related with the slowing down of spin-lattice relaxation time was observed around Tc. The correlation time of the magnetic fluctuation was estimated to be about 1.7×10−11 sec at Tc±2°.
  • Tomoyuki Hikita, Makoto Kitabatake, Takuro Ikeda
    1980 年 49 巻 4 号 p. 1421-1428
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    Effect of hydrostatic pressure up to 9 kbar has been studied by dielectric measurements on the six langbeinite-type crystals, Tl2Cd2(SO4)3, Rb2Cd2(SO4)3, K2Zn2(SO4)3, K2Mn2(SO4)3, Tl2Mn2(SO4)3 and (NH4)2Mn2(SO4)3. The pressure-temperature phase diagrams were determined. In the former two crystals, Tl2Cd2(SO4)3 and Rb2Cd2(SO4)3, a new phase was found between the P1 and P212121 phases at high pressure. In the crystal K2Zn2(SO4)3 another phase appeared between the P213 and P21 phases, and the behavior is similar to that in (NH4)2Cd2(SO4)3. The P213→P212121 transition temperature in K2Mn2(SO4)3 linearly rises with increasing pressure. The last two crystals, Tl2Mn2(SO4)3 and (NH4)2Mn2(SO4)3 do not show any transition down to −196°C even under high pressure studied.
  • Tsutomu Nakamura, Masaru Kasahara, Itaru Tatsuzaki
    1980 年 49 巻 4 号 p. 1429-1433
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    Electric field gradient tensors at 87Rb sites in the paraelectric phase were obtained by observing the angular dependence of second order quadrupolar shifts. Temperature dependences of resonance lines were also measured from 60 to −105°C. It is found that in the paraelectric phase Rb atoms are located on the mirror plane perpendicular to the a axis. With lowering temperature, each resonance line splits into two in the incommensurate phase. On further cooling, some of lines become too broad to be observed. Several degrees above Tc, new lines appear and spectrum becomes essentially the same as that observed below Tc.
  • Toshihiko Dote, Masatoshi Shimada
    1980 年 49 巻 4 号 p. 1434-1441
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    By evolving Maxwell-Boltzmann transport equations, various quantities on swarm of charged particles have been analyzed. Although this treatment is properly general, and common transport equations for charged particles ought to be given, in particular, equations only for electrons were presented here. The relation between the random energy and the drift energy was first derived and the general expression of the electron velocity was deduced too. For a simple example, one dimensional steady-state electron swarm in a uniform medium was treated. Electron swarm characteristics numerically calculated in He, Ne or Ar exhibited some interesting properties, which were physically clearly elucidated. These results were also compared with several data already published. Agreements between them were qualitatively rather well in detailed structures.
  • Toshihiko Dote, Masatoshi Shimada
    1980 年 49 巻 4 号 p. 1442-1448
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    As a correlated subject of electron swarm behavior analyzed by using transport equations, a general theory of the average energy loss factor of electrons is presented. From the energy balance equation, how the energy gain of electrons gained from the electric field is divided into several energy losses is first elucidated. Subsequently a theory of energy loss factor of electrons is established, on the basis of which characteristics of loss factors for He, Ne and Ar are drawn and their properties are discussed. Finally those calculated results are compared with some published data. Conception of the loss factor will be available for clarification of the energy loss mechanism of electrons in gas discharges.
  • Norimichi Kojima, Kuniro Tsushima, Ikuji Tsujikawa
    1980 年 49 巻 4 号 p. 1449-1455
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The optical transition 2F7⁄22F5⁄2 of Yb3+ in the antiferromagnet YbCrO3 has been studied. The exchange splittings for the ground and excited Kramers doublets were observed in the antiferromagnetic state. From the analysis of the splitting of the ground Kramers doublet as a function of applied magnetic field, it is concluded that main Cr–Yb magnetic interactions are the Dzyaloshinsky-Moriya antisymmetric and the anisotropic-symmetric exchange interactions, which cause the splittings of the Kramers doublets in the absence of the external magnetic field. Besides single-ion excitations, a cooperative transition corresponding to the simultaneous excitation of the 2F7⁄22F5⁄2 transition on a Yb3+ ion and a spin flip of the ground doublet on its neighbouring Yb3+ ion was observed.
  • Norimichi Kojima, Kuniro Tsushima, Susumu Kurita, Ikuji Tsujikawa
    1980 年 49 巻 4 号 p. 1456-1462
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    R exciton lines of YbCrO3 corresponding to the 4A2g2Eg transition of Cr3+ have been measured at 4.2 K, where a first order phase transition induced by magnetic field H0(⁄⁄a)∼67 kOe has been found. We concluded that this phase transition is a metamagnetic transition at which the weak ferromagnetic moment of the Cr3+ spins reverses its coupling with the magnetic moment of the Yb3+ spins from antiparallel to parallel. By the analysis of the spectral changes in the metamagnetic transition, the molecular field upon the Cr3+ ion due to the Cr–Yb magnetic interaction was estimated. Generally, if the magnetic moment of the rare-earth spins couples antiparallel to the weak ferromagnetic moment of the transition-metal spins for other orthochromites and orthoferrites, the metamagnetic transition of this type will be expected.
  • Norimichi Kojima, Kiyoshi Aoyagi, Kuniro Tsushima, Ikuji Tsujikawa, Sa ...
    1980 年 49 巻 4 号 p. 1463-1468
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Absorption spectra corresponding to the 4A2g2Eg transition of Cr3+ in YbCrO3 were studied. In the lowest energy region, R exciton lines with Davydov splitting were observed, and the magnitudes of the inter-sublattice exciton transfers were obtained by the analysis of these spectra. In the shorter wave length side of R exciton lines, a band(R′) of electric dipole character was observed, which has an anomalous shape with a sharp cut-off at the lowest energy side and fine structure. The temperature and magnetic field dependences of R′ band suggest that it corresponds to the simultaneous excitation of a Cr3+ exciton and a spin flip of the Yb3+ ground state. From the analysis of the anomalous shape of R′ band, a negative dispersion of the Cr3+ exciton was found to be −16 cm−1.
  • Setsuko Matsumoto, Hironaga Matsumoto, Ryumyo Onaka
    1980 年 49 巻 4 号 p. 1469-1474
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The electro-reflectance spectra of KDP have been measured by applying an electric field along the z-axis in the photon energy region from 6 eV to 10.5 eV, from which the changes of the real part (Δε1) and imaginary part (Δε2) of the dielectric constant are deduced. The spectrum of Δε2 shows an absorption band-like shape at about 8.3 eV, a little lower energy than the reflection summit, and is interpreted as the change of the absorption intensity relevant to the electron transfer from the oxygen ions of a PO4 tetrahedron to the nearby hydrogen ions. The spectrum of Δε1 shows a dispersion-like shape around the Δε2 band, and the change in the region below 7 eV well corresponds to the spectrum of the electro-optic coefficient ρ63, though discrepancy is found in the absolute values of Δε1 between the one measured and the one estimated from the electro-optic effect.
  • Yoshihiro Kamiya, Toshiaki Goto
    1980 年 49 巻 4 号 p. 1475-1479
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    The intensity distribution of elastic scattering agrees satisfactorily with the dynamical theory of electron diffraction if amorphous surface layers such as oxide and contamination are quite thin. The extinction contour formed by inelastic scattering of plasmon excitation is studied in detail. The difference of absorption coefficients obtained from elastic scattering and electron microscopic images is estimated by including the deviation of the Bragg condition for inelastic scattering.
  • Junzo Takahashi, Sadae Yamaguchi, Yutaka Fujino, Kunio Ozawa, Junichir ...
    1980 年 49 巻 4 号 p. 1480-1485
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    Direct determination of the lattice location of Si and Al in Cr-2.3 a/o Si and Cr-1.4 a/o Al crystals has been made by measuring backscattered proton and X-ray emission. Both yields along some axial and planar directions show channeling dips which coincide almost with each other. It is concluded that Si and Al atoms occupy the substitutional sites in Cr at room temperature.
  • Makoto Hashi, Soji Tsuchiya, Kazuo Takayanagi
    1980 年 49 巻 4 号 p. 1486-1496
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The low-energy molecule-molecule collisions are studied on the basis of the perturbed rotational state (PRS) functions, which are defined for the system of two polar molecules interacting with each other by the dipole-dipole interaction. By making use of the PRS functions as a basis set, a semiclassical impact-parameter calculation is carried out to determine rotational transition probabilities in HF–HF collisions. It is demonstrated that a near-resonant rotation-to-rotation energy transfer has a large probability and the relevant cross section is determined predominantly by the long-range dipole-dipole force, and that the sum of the quantum numbers m (projections of the rotational angular momenta) of two polar molecules is likely to be conserved.
  • Jiro Ozaki, Yasuo Tomishima
    1980 年 49 巻 4 号 p. 1497-1504
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The analytical expressions suitable for the Monte Carlo calculation to obtain the solution of Schrödinger’s equation of hydrogen molecular ion in a strong magnetic field are derived. The wave functions, the energy values and the equilibrium internuclear distances of 1σg state of H2+ are obtained numericallly through the Monte Carlo simulation and compared with other results based on the variational method. The agreement between them is fairly good over a wide range of magnetic field.
    The calculation of the energy values of 1πg state of H2+ for various internuclear distances taking a constant magnetic field as a parameter, shows that the antibonding 1πg state in the absence of the external magnetic field changes to a bonding state with an increasing magnetic field. The lowest energy values and the equilibrium internuclear distances of 1πg state are also calculated for various magnetic field.
  • Ken Ishikawa, Toru Yosihara, Hideo Suzuki
    1980 年 49 巻 4 号 p. 1505-1512
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    We assume such a model for retinylidene iminium salt in solution that retinylidene iminium cation interacts not only with its counter anion X but also with the local field E due to solvent molecules. On the basis of the model, the π-electronic states of the cation are calculated by our previous LCAO–ASMO–SCF–CI method, assuming that X is a negative point-charge in the plane of the π-system and E is a reaction field acting on the salt dipole moment in a spherical cavity.
    It is thus shown that the observed wavelength λmax of absorption maximum of the salt in solution can be explained with a reasonable choice of both the distance R of X from N16+ and the radius a of the cavity. It is also shown that the λmax decreases with decreasing R while it steeply increases to reach a saturated value as the dielectric constant ε of solvent increases.
  • Akio Itoh, Katsumi Ohnishi, Fumio Fukuzawa
    1980 年 49 巻 4 号 p. 1513-1518
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    The single and double electron loss cross sections σ01, σ12 and σ02 of helium beams have been measured for target gases H2, He, N2, O2, CO2, CH4, C2H6 and C3H8 in the energy range from 0.7 to 2.0 MeV. By using cross sections for carbon-containing molecules, the additive rule was verified for the electron loss processes of helium beams in this energy region. Loss cross sections for a carbon atom were deduced. Empirical formulae for single electron loss cross sections were obtained for atomic targets H, He, C, N and O. The ratio between two single electron loss cross sections, σ01⁄σ12, and the ratio between single and double electron loss cross sections, σ01⁄σ02 are discussed.
  • Naohisa Wada, Mitsuo Honda, Toru Yosihara, Hideo Suzuki
    1980 年 49 巻 4 号 p. 1519-1523
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The optical absorption of D-(—)-luciferin (LH2) in ethanol is calculated by our previous LCAO–ASMO–SCF–CI method for π-electrons.
    It is found that the wavelengths of absorption of LH2 observed in ethanol can be reproduced only when the screening of two-center Coulomb repulsion integrals is taken into account for all the pairs of atoms except bonded ones. It is also found that the observed absorption spectrum can be explained by the model of LH2 interacting with two ethanol point-dipoles.
  • Takashi Okazaki, Tomokazu Kato
    1980 年 49 巻 4 号 p. 1524-1531
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    A new possibility for plasma heating is proposed and theoretical investigation is performed. Under a suitable experimental condition, the wave induced by the two-stream instability and Buneman/ion-acoustic wave induced by the return current can coexist and interact to yield a new contribution to plasma heating by the relativistic electron beam. The authors assume this is the case and develop the formulation necessary for the analysis of the spectral function of turbulent plasma. Detail of the interaction mechanism and numerical estimation of stopping power are given in the following paper (J. Phys. Soc. Jpn. 49 (1980) 1532).
  • Takashi Okazaki
    1980 年 49 巻 4 号 p. 1532-1541
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    Anomalous heating is investigated in the system composed of a plasma and a relativistic electron beam (REB) along a uniform external magnetic field. The wave kinetic equation derived in the preceding paper (J. Phys. Soc. Jpn. 49 (1980) 1524) is applied to the REB-plasma system. As the mechanism of plasma heating, the wave of the two-stream instability and Buneman or ion-acoustic wave induced by the return current are coupled through the nonlinear wave-particle interaction. High heating rate is obtained from the estimation of the stopping power. The turbulent collision frequency and the perpendicular energy transfer agree with the experimental and numerical results.
  • Hiroshige Watanabe, Yasuyuki Funato, Shigeo Nagao
    1980 年 49 巻 4 号 p. 1542-1549
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    The characteristics of the equilibrium of a current carrying plasma of a circular cross section with a non-planar magnetic axis are studied analytically. The displacement of the plasma column in comparision with a geomtrical axis of the system is derived. It is shown that the external magnetic field is required to maintain the equibribrium position of the plasma column at desired values. The stability conditions of MHD instabilities of the plasma column with a straight helical magnetic axis are determind by making use of the negative V″ criterion and the energy priciple.
  • Yoshimitsu Amagishi, Harukazu Iguchi, Yoshihumi Ito, Takaya Kawabe, At ...
    1980 年 49 巻 4 号 p. 1550-1556
    発行日: 1980/10/15
    公開日: 2007/05/29
    ジャーナル 認証あり
    Experiments are described in which the correlation time and fluctuation level of ion waves are measured under the condition of turbulent heating using twin capacitive probes. When the resistivity becomes anomalous, the correlation time becomes shorter, typically several periods of ion waves, and the energy density of the waves is of the order of 0.2·10−2 neTe. The ion heating rate and correlation times of ion waves (electrostatic ion cyclotron waves) are well explained by the quasilinear theories dealing with the stochastic mechanism. The anomalous resistivity is also found to result in the rapid electron heating.
  • Kazunari Ikuta
    1980 年 49 巻 4 号 p. 1557-1560
    発行日: 1980/10/15
    公開日: 2007/06/01
    ジャーナル 認証あり
    A unique nature of the magnetic configuration of current-carrying plasma in ferromak is demonstrated and it is compared with the stellarator configuration. The presence of magnetic islands in the ferromak configuration is also suggested.
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