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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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Volume 50, Issue 3
Displaying 1-50 of 58 articles from this issue
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Ikuo Ono1981 Volume 50 Issue 3 Pages 719-720
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFree-energies for the randomly mixed ±J model on cactus trees are presented for para, ferro and “ROP” phase. The lowest free-energy of these three phases is shown to be the ROP phase through the whole bond-concentrations. The zero-point entropies per spin for the ROP phase are estimated to be 0.1387 kB for a triangular and 0.0686 kB for a square cactus tree in the case of equally mixed bonds.View full abstractDownload PDF (228K) -
Kimitoshi Kono, Shun-ichi Kobayashi, Wataru Sasaki1981 Volume 50 Issue 3 Pages 721-722
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe propagation of the third sound in a superfluid 4He film with wavelength of several ten μm was studied at 0.9 K by the conventional method employing narrow strips of superconducting films as an emitter and detectors. Some anomalous wave-forms which are very much different from those for long wavelength were observed. The resuls are discussed in connection with the recent theory of solitons in a superfluid 4He film.View full abstractDownload PDF (220K) -
Haruo Takagi1981 Volume 50 Issue 3 Pages 723-724
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe dynamics in the A and A1 phases of superfluid 3He is investigated. Second sound (entropy wave) and longitudinal spin wave are discussed within the framework of the hydrodynamic equations. In the A1 phase second sound is strongly coupled to a spin wave, while in the A phase far from the A1 phase they are separated. In the A phase close to the A1 phase they are coupled, the coupling being determined by temperature, pressure and magnetic field. If the wave vector k\simeq103 cm−1, this coupling is well appreciable and the velocity of second sound becomes fast enough to be detected.View full abstractDownload PDF (236K) -
Daijiro Yoshioka, Hidetoshi Fukuyama1981 Volume 50 Issue 3 Pages 725-726
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSGraphite in a strong magnetic field (H⁄⁄c-axis) has a one-dimensional electronic energy spectrum with small bandwidth. A recent experiment of magneto-resistance on graphite in H\lesssim30T, which showed an anomalous increase of the resistance, is explained by a charge density wave (CDW) instability associated with this one-dimensional energy spectrum. A rough agreement is found between the experiment and the theoretical estimate of the critical temperature based on the mean field approximation.View full abstractDownload PDF (228K) -
Hidekazu Tanaka, Katsunori Iio, Kazukiyo Nagata1981 Volume 50 Issue 3 Pages 727-728
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSEPR spectra of single crystals of CsCuCl3 were investigated around the structural phase transition point (∼420 K) at X-band frequencies. The magnitude of linewidth and its anisotropy show that the antisymmetric exchange interactions dominate for spin dynamics in both the high- and low-temperature phases. A picture in which the almost static local distortion of lattice persists above the transition point is presented to understand the high-temperature EPR properties in this system.View full abstractDownload PDF (244K) -
Nobuo Iwata, Tomoaki Matsushima, Hironobu Fujii, Tetsuhiko Okamoto1981 Volume 50 Issue 3 Pages 729-730
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMeasurements of magnetization and magnetic susceptibility were made on compounds (Cr1−xNix)2P (0.35≤x≤1). These compounds have an orthorhombic structure for 0.35≤x≤0.5 and a hexagonal structure for x≥0.55. In the orthorhombic phase, the compounds are ferromagnetic for 0.45<x≤0.5 and paramagnetic for 0.35≤x≤0.43. The Curie temperature and the spontaneous magnetization decrease rapidly with decreasing x. The Curie constant is almost independent of x. For the hexagonal structure, the compounds are Pauli paramagnets.View full abstractDownload PDF (256K) -
Akira Shinogi, Keizo Endo, Nobuyoshi Yamada, Tetuo Ohoyama1981 Volume 50 Issue 3 Pages 731-732
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe magnetic susceptibility and NMR measurements of a CsCl type binary alloy CoTi were performed at temperatures between 4.2 and 800 K. The susceptibility and its temperature dependence was found to be large and the conventional Knight shift versus susceptibility plot was found to be linear. From the slope of this K-χ plot the hyperfine field is determined to be a large positive value of +140±3 kOe/μB.View full abstractDownload PDF (232K) -
Seishi Kudo, Takuro Ikeda1981 Volume 50 Issue 3 Pages 733-734
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSHydrostatic pressure effect on the dielectric constant εc or K2SeO4 was studied. The incommensurate transition temperature T2 lowers linearly with the slope of −7.3±0.2 K/kbar. The Curie temperature T3 also decreases with pressure, but the slope denpends on pressure; the initial slope is −17.2±2.5 K/kbar and the slope above 0.6 kbar is −11.4±1.0 K/kbar. The dielectric behaviors under the pressure are qualitatively discussed based on the theoretical treatments already developed by other authors, and some problems are suggested.View full abstractDownload PDF (252K) -
Akio Yamanaka, Masaru Kasahara, Itaru Tatsuzaki1981 Volume 50 Issue 3 Pages 735-736
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBrillouin shifts of the C11 mode were measured near the normal-incommensurate phase transition temperature with two scattering angles: 90 and 45 degrees. The scattering angle dependence of the Brillouin shifts is found and is inferred to be caused by the fluctuation of an order parameter.View full abstractDownload PDF (244K) -
Mitsuo Wada, Akikatsu Sawada, Yoshihiro Ishibashi1981 Volume 50 Issue 3 Pages 737-738
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe Raman scattering technique has been employed to observe the temperature dependent modes associated with the incommensurate phase transitions in biphenyl. A new soft mode, whose frequency becomes zero as T1=40.0 K is approached from below, has been found in the αzz spectra. A temperature-dependent mode in the αxy spectra, which had previously been assigned to the “soft” mode could be observed even above T1. In addition, the anomalous increase in Rayleigh wing was observed in the vicinity of T1. These features show that the latter mode with αxy should be interpreted in terms of a precursor-order-induced hard-mode.View full abstractDownload PDF (228K) -
Kazushige Kawabata, Masayuki Ido, Takashi Sambongi1981 Volume 50 Issue 3 Pages 739-740
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe Hall voltage and conductivities perpendicular to the b-axis of NbSe3 were measured. The former is strongly current-dependent in the non-Ohmic regime, while the transverse conductivities are Ohmic. The results are consistently explained by taking account of the contribution of the sliding charge-density-wave to the conductivity parallel to the b-axis.View full abstractDownload PDF (208K) -
Shunji Ido, Satoshi Higaki, Jun-yoshi Okehara, Kazuo Imasaki, Katsunob ...1981 Volume 50 Issue 3 Pages 741-742
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSOne dimensional computational studies on pellet gain optimization in implosion, ignition and burn processes by light ion beam are presented. The effects of thickness of Au shell or tamper and fuel mass are investigated and the breakeven condition is examined for 100TW, 10 MeV, 2MJ proton beam with a Gaussian power shape.View full abstractDownload PDF (256K) -
Masaharu Ohba, Kiyoshi Arakawa1981 Volume 50 Issue 3 Pages 743-750
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPair correlation functions are given for fluid mixtures containing ionic species, based on the interaction site model, and the dielectric properties of the mixtures are discussed. The static dielectric function ε(k) is expressed in terms of site-site correlation functions. Moment conditions of site-site pair correlation functions are also derived. The correlation function expression of the dielectric screening factor is given, and the features of its behaviors are elucidated. As the simplest examples, the static dielectric functions and screening functions are calculated in the case of dilute gases.View full abstractDownload PDF (904K) -
Tsuyoshi Murao1981 Volume 50 Issue 3 Pages 751-759
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe structural energy, the phonon dynamics, and the stability condition in quasi one-dimensional (1-D) conductors are discussed with the pseudopotential model including the Coulombic interchain interaction. The following cases are considered; (A) single kind and (B) two kinds of chains in crystal. For case (A), the type of mode coupling and the phonon dispersion are investigated in various states (T>Tp with and without QLRO and T<Tp with LRO), and the relation of the structural energy to the phonon dispersion is indicated. When only one kind of chains is in the ordered state in case (B), the mode coupling also takes place in the disordered chain by the effect of the ordered chain and the nature of the phonon modes is clarified. The sliding motion of CDW in individual chain in 3-D crystals is also discussed.View full abstractDownload PDF (1000K) -
Katsurou Hanzawa, Akira Yanase, Tadao Kasuya1981 Volume 50 Issue 3 Pages 760-768
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA simple model is proposed for the anomalous magnetic properties of CeB6, in which the Γ7 doublet is lower than the Γ8 quartet in the crystalline field but the antiferromagnetic exchange interaction exists only between the Γ8 of nearest neighbour sites. Within the molecular field approximation, the first order phase transition and an unusual antiferromagnetic state at high magnetic field parallel to ⟨100⟩-axis appear. Unusual properties originate the competition between the quartet moments, which want to be antiparallel each other, and the total moments, which want to align the direction of applied field. Comparison between the calculation and the experiment of CeB6 is done, which reveals some important fundamental characters.View full abstractDownload PDF (1000K) -
Akio Yoshimori, Satoru Inagaki1981 Volume 50 Issue 3 Pages 769-773
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPossible fourth order interactions among localized spins in an orbital-degenerate case (S>1⁄2) are discussed as an expansion from the Mott insulator limit, with reference to a model for the electronic structure of NiS2. Then a phenomenological model to study the antiferromagnetic structure of NiS2 is presented.View full abstractDownload PDF (536K) -
Ichiro Hase, Hisao Fukuda, Akio Yoshimori1981 Volume 50 Issue 3 Pages 774-778
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of the anisotropy energy on the first kind antiferromagnetic structure in the pyrite type crystal is discussed in a phenomenological model, in which higher order spin interactions are taken into consideration. The obtained results are compared with experimental ones.View full abstractDownload PDF (620K) -
Nobuo Wada, Taiichiro Haseda1981 Volume 50 Issue 3 Pages 779-786
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe specific heats C and susceptibilities χ are measured in each field-induced spin ordered state for the A- and B-site ions in β-Ni(NO3)2·4H2O, when an external magnetic field is precisely aligned along ion z-axis. When H⁄⁄zA, the Tc-H phase boundary ranges between 9.9 kOe and 44.5 kOe. The maximum Tc on this phase boundary is 0.557 K at H=27.6 kOe. The corresponding phase boundary for H⁄⁄zB ranges between 32.2 kOe and 55.2 kOe with a maximum Tc of 0.396 K at 43.7 kOe. These results together with the temperature dependences of C and χ at zero field prove the presence of the two different ordered states. The crystal field parameters and the exchange interactions for these sites are estimated to be (DA−EA)⁄k=2.2 K, (DA+EA)⁄k=8.2 K, (DB−EB)⁄k=4.8 K, (DB+EB)⁄k=8.1 K and 2zJA⁄k=0.97 K and 2zJB=0.95 K (antiferro-magnetic), respectively.View full abstractDownload PDF (792K) -
Kinshiro Hirakawa, Gen Shirane, John D. Axe1981 Volume 50 Issue 3 Pages 787-791
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRecently an anomalously large “excess” magnetic intensity was observed by Hirakawa and Yoshizawa for the (004) neutron reflection of K2CuF4. This was interpreted as a magnon condensate, superimposed on the magnetic Bragg reflection. A careful reexamination of this magnetic intensity as a function of incident neutron energies, as well as crystal dimensions, led us to conclude that this anomaly is caused by a novel extinction effect associated with neutron polarization.View full abstractDownload PDF (564K) -
Yoshiro Kakehashi1981 Volume 50 Issue 3 Pages 792-801
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe formation energy, the deviation of the lattice parameter from Vegard’s law and the bulk modulus of Fe-base and Ni-base 3d transition metal alloys, are calculated on the basis of the two-band model and the virial theorem. The results are in good agreement with the experimental values and are interpreted with three important factors i.e. the d-d bonding effect, the s-d charge transfer effect and the magnetic effect due to the changes of the magnitudes of the local magnetic moments. Especially, it is verified numerically that the magnetovolume effect in many 3d alloys is described by the approximate magnetic pressure which is equal to a linear combination of the squares of the local moments.View full abstractDownload PDF (1152K) -
Hideo Hasegawa1981 Volume 50 Issue 3 Pages 802-809
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA spin fluctuation theory developed previously by the present author using the functional integral method is generalized to discuss the finite-temperature properties of concentrated ferromagnetic binary alloys, AxB1−x. We study the concentration- and temperature-dependences of various quantities such as the average magnetic moment, the local magnetic moment relevant to each constituent atom, the total spin susceptibility and partial susceptibilities of A and B atoms. It is shown that the theory in the limit of T=0 K reduces to that proposed by Hasegawa and Kanamori, and that the defect inherent in the one-electron theory of magnetic alloys is removed by including the effect of spin fluctuations. Numerical calculations are carried out for FeCr alloys.View full abstractDownload PDF (864K) -
Shigeyuki Murayama, Hiroshi Nagasawa1981 Volume 50 Issue 3 Pages 810-816
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the nuclear spin-lattice (T1) and spin-spin (T2) relaxation times in α-Mn metal has been studied for the four different Mn sites between 95 K (TN) and room temperature by means of cw and pulsed NMR techniques. The 1/T1 for sites I and II estimated from cw NMR linewidth was found to be almost temperature independent as ∼1.9×105 (s−1). This high relaxation rate is interpreted in terms of the existence of localized spin fluctuations at sites I and II. The temperature dependence of 1/T1 for sites III and IV was found to be 1⁄T1=0.50×103+4.4T (s−1) from 120 K to room temperature. The first term arises from the localized spin fluctuations at sites I and II via RKKY type interaction. The second T-linear term is Korringa type relaxation effect due to the band electron in α-Mn.View full abstractDownload PDF (848K) -
Yoshio Suzuki, Hideki Miyajima, Giyu Kido, Noboru Miura, Soshin Chikaz ...1981 Volume 50 Issue 3 Pages 817-822
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetization of Fe3Pt Invar alloys with various long range order parameters has been measured in high magnetic fields up to 250 kOe. The relationship between the Curie temperature and the order parameter was obtained, and was interpreted in terms of the two γ states model, in which the excitation energy between the low spin states and the high spin states of Fe depends on the local environment of the Fe atoms. In disordered Fe3Pt alloys, a non-unique local environment, that is, inhomogeneity of the order parameter, causes non-linear Arrott plots.View full abstractDownload PDF (676K) -
Osamu Yamada, Ikuo Nakai1981 Volume 50 Issue 3 Pages 823-827
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe local magnetic moment at the Curie temperature in the 35 at% Ni–Fe alloy retains still a half value of the magnetic moment at 0 K. Taking into consideration this fact, new formulas are proposed, which describe reasonably the phenomena of spontaneous volume magnetostriction and forced volume magnetostriction. The magnetovolume coupling constant determined by the new formulas is approximately 1.2×10−8 cm6/emu2 for Fe–Ni Invar alloys, which is independent of the Ni concentration.View full abstractDownload PDF (592K) -
Nobuhiro Shiotani, Nobuhiko Sakai, Hisashi Sekizawa, Tadashi Mizoguchi1981 Volume 50 Issue 3 Pages 828-834
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurements of the Compton profiles and angular correlations of positron annihilation radiations on the amorphous Mg70Zn30 alloy are carried out. From the Compton profile measurement it is found that the valence electrons are free-electron like and the Fermi momentum is 0.77±0.02 atomic units (kF=1.46±0.02 A−1) in agreement with the value calculated from a simple electron gas model. The angular correlations of positron annihilation radiations measured at 80 K and 300 K show significant smearing of the break at the Fermi momentum. The smearing at 80 K is heavier than that at 300 K. The smearing is found to be caused by localization of the positron. The potential for localization of the positron is much shallower and wider than that due to a vacancy in crystalline materials. The positrons are localized in low density dilated regions of the amorphous structure.View full abstractDownload PDF (820K) -
Yasunori Kubo, Shinya Wakoh1981 Volume 50 Issue 3 Pages 835-842
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSComplex dielectric function ε(0, ω) and energy-loss function −Im [ε(0, ω)−1] of the 3d transition metals (V, Cr, Fe and Ni) are calculated within RPA with the use of the energy values and the wave functions determined by the APW method in the energy range 0–40 eV and are compared with experiment. The theoretical results of −Im [ε(0, ω)−1] are in fairly good agreement with experiment in the energy range 10–40 eV. But agreement between theoretical ε(0, ω)’s and experimental ones is not so good in the energy range 1–8 eV as in the case of the 4d transition metals (Nb and Mo).View full abstractDownload PDF (984K) -
Toshikazu Hirose, Masaru Kawaminami1981 Volume 50 Issue 3 Pages 843-849
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe EPR spectra of Cr3+ ion accompanied with a nearest neighbour oxygen vacancy (Cr3+–Vo center) were observed over a temperature range from −150 to 200°C and showed ‘strong axial field lines’. The crystalline fields have been obtained as follows; |D|=84 GHz, |E|=2.6 GHz at 25°C, and |D|=120 GHz, |E|=23 GHz at −100°C. These fields are very large compared with those observed in many other crystals. The angular dependence of the EPR spectra has been interpreted by a rotation of oxygen octahedra about a quasi-cubic diagonal ⟨111⟩ axis and the displacements of tungsten atoms. From the temperature dependence of the EPR spectra the softening of the rotational condensed phonon modes of the oxygen octahedra was observed.
The relations between the EPR spectra and the structural phase transitions in WO3 are discussed.View full abstractDownload PDF (804K) -
Syozo Kubo, Eiji Hayashiguchi1981 Volume 50 Issue 3 Pages 850-854
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTheoretical investigation is made on the effect of the isotropic scattering on an unsteady radiative heat transfer through an absorbing, emitting and scattering medium in a semi-infinite space bounded by a semitransparent plate. The system is initially in a uniform state. At an instance the temperature of the plate is changed to a constant value in addition to the impose of a beam radiation through the plate. They are maintained hereafter. It is found out that the effect of the scattering is practically regarded as a similarity effect, in which the standard length scale is chosen the inverse of the extinction coefficient, when the albedo of scattering is 0∼0.8.View full abstractDownload PDF (544K) -
Shinichi Katsuki, Hiroshi Taketa1981 Volume 50 Issue 3 Pages 855-860
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe model potential Xα method is outlined and applied to CO–Ni chemisorption system. Owing to Bonifacic and Huzinaga’s model potential, Slater’s Xα potential, and the analytical fit of atomic electron densities and their cube roots to Gaussian functions, it has become very easy to calculate the matrix elements of the Hamiltonian without invoking any empirical parametrization in the cluster calculation. In spite of simple computational implementation, reliable results are obtained. The results are compared with experiments and the other calculations.View full abstractDownload PDF (772K) -
Shigeru Ohba, Takashi Matsuda, Ichiro Hatta, Jimpei Harada1981 Volume 50 Issue 3 Pages 861-865
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElastic constants of K2[PtCl4] were determined at room temperature by using the ultrasonic pulse superposition method. The measured elastic stiffness constants are: C11=31.0±0.6, C33=23.2±0.6, C44=6.04±0.37, C66=4.68±0.35, C12∼9.28 and C13∼11.3 in units of 1010 dyn/cm2. By the use of these constants profiles of the X-ray diffuse scattering due to long-wavelength phonons are well reproduced.View full abstractDownload PDF (500K) -
Masuo Fukui, Atsushi Kamada, Osamu Tada1981 Volume 50 Issue 3 Pages 866-872
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSUsing a nonlocal Maxwell equation and employing models on specular reflection of excitons at a surface, we describe the dispersion relation of surface exciton polaritons in anisotropic spatially dispersive medium, suitably generalized for Cl-excitons in ZnO. Numerical calculations have been performed and those results are compared with ones for different additional boundary conditions previously derived for isotropic media. It may be noted that the anisotropy influences significantly to the characteristics of surface exciton polaritons. We find that the experimental dispersion relation measured by DeMartini et al. can be successfully interpreted by the present treatments, including an intrinsic dead layer of 50 Å in thickness.View full abstractDownload PDF (868K) -
Eiichi Yagi, Akio Koyama, Hideo Sakairi, Masaya Iwaki, Ryukiti R. Hasi ...1981 Volume 50 Issue 3 Pages 873-880
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe lattice location of Ni atoms implanted into Al crystals has been investigated by means of proton channeling method. The implantation has been carried out at 180 kV with doses of 2×1016Ni/cm2 or 5×1015Ni/cm2 at room temperature. The measurements of angular dependence of backscattering yields from Al and Ni with respect to ⟨100⟩, ⟨110⟩ and ⟨111⟩ axial channels indicate that most of implanted Ni atoms occupy the interstitial sites displaced in the ⟨100⟩ direction by (1.2–1.3)(a⁄4) (a=lattice constant). Small amount of Al atoms located at similar interstitial sites have been observed. It is interpreted that these interstitial Al and Ni atoms take the ⟨100⟩ mixed dumb-bell configuration.View full abstractDownload PDF (1036K) -
Hidemi Yoshida, Hiroshi Saito, Shigeo Shionoya1981 Volume 50 Issue 3 Pages 881-888
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPicosecond time-resolved spectra of the spontaneous luminescence from high density electron-hole plasma in CdSe and CdS are measured at 4.2 K under the band-to-band excitation. It is observed that two emission bands appear, which are due to the two kinds of plasmas consisting, respectively, of the A and B valence band holes. From the time changes of these two bands, it is obtained that the relaxation time of holes from the B to A valence band is ∼35 ps for CdSe and ∼55 ps for CdS. This inter-valence band relaxation of holes is caused by the acoustic phonon scattering in CdS, but in CdSe the LO-phonon scattering plays an important role in addition to the acoustic phonon scattering.View full abstractDownload PDF (1112K) -
Yasuo Nozue, Manabu Itoh, Kikuo Cho1981 Volume 50 Issue 3 Pages 889-894
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe excitonic polariton dispersion for k⁄⁄[111] is determined by the two-photon-resonant Raman scattering via intermediate excitonic molecule state. Existences of the k-linear effect and the heavy and light masses are clarified. Several levels of excitonic molecules are found.View full abstractDownload PDF (700K) -
Masanori Hangyo, Hakaru Yamanaka, Riso Kato1981 Volume 50 Issue 3 Pages 895-901
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRelaxation processes of the vibronic levels of 1B1 state in NaNO2 have been studied by the measurement of hot luminescence (H.L.) in the crystal. Several weak lines have been detected at the energy positions where H.L. lines are expected to appear. These lines are identified as H.L. based on their dependences on the energy of exciting light. From the decay time of the ordinary luminescence (O.L.) of about 7 nsec and the intensity ratios of H.L. to O.L., the lifetimes of (1′, 0′) and (0′, 1′) vibronic levels are estimated to be about 1.5 and 5 psec, respectively.View full abstractDownload PDF (784K) -
Teruaki Minagawa1981 Volume 50 Issue 3 Pages 902-906
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn X-ray diffraction study was made on a structural transformation between type 2H, the low temperature form, and type 12R, the high temperature form, in PbI2 crystals. 2H crystals grown in gel at room temperature were changed to type 12R through the course 2H→faulted 12R→faulted 12R′→12R by successive heat treatments. The faulted 12R structures could be analyzed by using a simplest model in which the layer stacking was specified by only one parameter. It was revealed that in a faulted 12R structure there exist all n consecutive layers in the same proportion. It was found from the fact that the transformation from gel-grown 2H to 12R proceeds straightforwardly through a short route to 12R. A study on the reverse transformation from 12R to 2H in the gel-grown 2H crystals and on the 2H-12R transformation in 12R crystals grown from vapour has shown that these transformations occur directly.View full abstractDownload PDF (740K) -
Noboru Yamada, Masaki Maeda, Hideaki Adachi1981 Volume 50 Issue 3 Pages 907-913
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSStructures of cubic and orthorhombic phases of langbeinite-type K2Mn2(SO4)3 have been determined at 20°C and −90°C by X-ray diffraction. Thermal parameters of oxygen atoms in the cubic phase are remarkably anisotropic and show unusually high values, whereas those in the orthorhombic phase are rather normal. The change in bond lengths and angles at the transition clarifies a rigid body motion of SO4 group. It is concluded that the principal structural change at the cubic-orthorhombic transition is characterized by ordering of sulfate groups.View full abstractDownload PDF (892K) -
Jun’ichiro Mizuki, Yasuo Endoh1981 Volume 50 Issue 3 Pages 914-919
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSConventional high pressure techniques using a clamped type pressure cell have been adapted for studies by neutron diffraction. Careful calibration of the pressure sensing apparatus and an appropriate choice of pressure transmitting medium enable accurate neutron diffraction measurements to be made at reduced temperature as low as 4 K. In the present studies we have demonstrated that using the clamped type microbomb neutron diffraction measurements can be easily made under the pressure up to 5 kbar within the temperature range 4 K–350 K.View full abstractDownload PDF (684K) -
Akio Kodama, Seiji Ishikawa, Yukio Mizuno1981 Volume 50 Issue 3 Pages 920-928
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe isotropic and directional Compton profiles of crystalline LiH are successfully calculated in the Heitler-London approximation. The calculation is carried out by explicit use of those Löwdin’s (symmetrically ortho-normalized) orbitals that are found by usins a kind of cluster approximation. The comparison with Paakkari, Halonen and Aikala’s calculation of LiH indicates that the present simple and honest approach is eventually more efficient than the ingenious ones originated by Löwdin, and further that the present approach will be applicable successfully even to oxide compounds which have been beyond the reach of the latter ones.View full abstractDownload PDF (984K) -
Haruo Sugiyama1981 Volume 50 Issue 3 Pages 929-932
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn improved stopping power formula Se, modified from the formulation by Lindhard, Scharff and Schiøtt, has been obtained by using the relativistic Hartree-Fock-Slater type screening function. The formula obtained predicts fairly well the periodic oscillation of Se with both projectile and target atomic number changes. The calculated results agree with experimental data within 10 to 20% errors in gaseous targets; however, some discrepancy is found in solid targets.View full abstractDownload PDF (404K) -
Yoshio Matsuura, Kuniya Fukuda1981 Volume 50 Issue 3 Pages 933-940
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe oscillatory structures of vuv emission continua originating from the lowest excited states 1u(3P2) have been observed for Ne2, Ar2 and Kr2 in the glow discharges with currents of the order of μA at pressures of a few Torr. From these structures the potential curves of the 1u(3P2) states have been calculated for Ne2 and Ar2 in the region of internuclear distances up to near the well minimum by making use of the method by Smith based on the WKB stationary phase approximation. Although the present calculation depends on the assumed ground state potential curves, it has been found that Cohen’s calculation of the Ne2 1u(3P2) potential falls far from our results, but Saxon’s calculation of the Ar2 1u(3P2) potential is in good agreement with our results.View full abstractDownload PDF (1100K) -
Yasuo Tomishima, Ryozo Akamatsu, Tetsuo Horita1981 Volume 50 Issue 3 Pages 941-948
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBloch’s hydrodynamic approximation for treating the charge oscillation of an atom is applied to the Thomas-Fermi atom extended by introducing a modified Weizsäcker correction. Normal mode solutions of the oscillation are obtained and the atomic photoabsorption cross section and the logarithmic mean excitation energy are calculated. The differences of the results from those of the simple Thomas-Fermi atom are as follows: (1) The eigenfrequencies of the normal modes consist of one discrete value ωD (<ωC) and continuous values between ωC and ∞, where ωC is a definite frequency characteristic for an individual atom. (2) The photoabsorption cross section has also a discrete value corresponding to the frequency ωD and continuous values for frequencies larger than ωC. (3) The logarithmic mean excitation energy becomes larger.View full abstractDownload PDF (828K) -
Takashi Abe, Keishiro Niu1981 Volume 50 Issue 3 Pages 949-953
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ion beam propagation in inertial confinement fusion by light ion beam is analysed. The anomalous deceleration of the beam ion occurs, when the beam including the electron interacts with the background plasma with a comparable number density. This deceleration is caused by the two stream instability between the beam and the background plasma electrons and then becomes maximum when each density is equivalent. The anomalous deceleration rate of the beam ion is computed by using the qusilinear theory. It is shown that the anomalous deceleration which the beam ion (1017 cm−3) accepts from the background plasma (1018 cm−3) is equivalent to the classical one from the background plasma with solid density (1021 cm−3).View full abstractDownload PDF (620K) -
Mitsuhiro Makino, Tetsuo Kamimura, Tetsuya Sato1981 Volume 50 Issue 3 Pages 954-961
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe initial value problem of the Hasegawa-Mima (HM) equation, which describes the propagation of drift waves in a low beta magnetized plasma, is numerically studied. Solitons are formed from an initial sinusoidal wave. For a wide range of initial conditions, the number of solitons and the recurrence time agree well with those obtained from the KdV eq. reduced from the HM eq. by Nozaki et al. As a result of nonlinear interactions among different solitons, their peak positions shift in the direction normal to the zeroth order convective motion in a regular but different fashion. When we start from a sinusoidal wave, the peaks of the generated soliton train line up on a line at an angle with respect to the convective direction. Two-dimensional collisions of different solitons are examined.View full abstractDownload PDF (896K) -
Shunjiro Ikezawa, Yoshiharu Nakamura1981 Volume 50 Issue 3 Pages 962-967
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPropagation of electron plasma waves in a large and unmagnetized plasma containing two Maxwellian distributions of electrons is studied experimentally. Two kinds of plasma sources which supply electrons of different temperature are used. The temperature ratio is about 3 and the density ratio of hot to cool electrons is varied from 0 to 0.5. A small contamination of hot electrons enhances the Landau damping of the principal mode known as the Bohm-Gross mode. When the density of hot electrons is larger than about 0.2, two modes are observed. The results agree with theoretical dispersion relations when excitation efficiencies of the modes are considered.View full abstractDownload PDF (728K) -
Rui-yan Lin, Kei-ichi Hirano, Masao Okamoto, Katsuhiro Shimizu, Tsuneo ...1981 Volume 50 Issue 3 Pages 968-975
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA system of 1-D transport codes has been developed for studying the discharge processes of compressional tokamak plasma in the Tuman-2, Tosca, and STP-3 devices. The code includes the effects of neutrals and impurity radiation. The model provides reasonably good fits of the main data from the experiments of Tosca and Tuman-2. The computational predictions for the STP-3 device are also presented. The computed results show that the average ion temperature of the STP-3 discharge with compression is about twice the value without compression. The higher the Ohmic heating power, the slower the optimum compression time becomes.View full abstractDownload PDF (784K) -
Akiyoshi Hatayama, Yuji Koshi, Masatada Ogasawara1981 Volume 50 Issue 3 Pages 976-979
Published: March 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe mixing length hypothesis is investigated for the purpose of making the underlying idea of the hypothesis clear in the case of the dissipative trapped ion instability. Three different approaches are employed; 1) analogy to the ordinary turbulence in hydrodynamics, 2) a nonlinear turbulent collision theory, and 3) a quasilinear theory of the density flattening. If the isotropic turbulence is assumed, the mixing length hypothesis can be derived by the first two approaches. The formula D\simeqγ⁄k⊥2, which is usually obtained from the mixing length hypothesis, can be derived by the third approach.View full abstractDownload PDF (496K) -
Mitsuhiro Makino, Tetsuo Kamimura, Tosiya Taniuti1981 Volume 50 Issue 3 Pages 980-989
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNumerical studies of the Hasegawa-Mima equation, derived in the context of drift waves but equivalent to the quasi-geostrophic vortex potential equation for Rossby waves, show the stable properties of solitary vortices which are two dimensional, localized, steady and translating solutions of this same equation. A solitary vortex can propagate only in the direction (x-direction) perpendicular to the density gradient. When this solitary vortex solution is inclined at some angle with respect to the x-axis, its propagation direction oscillates in the x and y plane. In two dimensional collisions, i.e. head-on collision and overtaking, solitary vortices interact two-dimensionally and recover their initial shapes at the end of both types of collisions.View full abstractDownload PDF (1268K) -
Masatada Ogasawara, Akinari Hirao1981 Volume 50 Issue 3 Pages 990-994
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSComparison of the mechanisms of the Weibel instability and the field generating thermal instability is made on the basis of the Boltzmann equation. The case k⊥∇T0⁄⁄∇n0 is investigated, where k is the wave vector, T0 and n0 are the zeroth order temperature and the number density. In the collisional plasma (klm<<1, where lm is the electron mean free path), the thermal instability is unstable, but the Weibel instability is stable. In the collisionless case (klm>>1), the situation is vice versa. When the equilibrium velocity distribution function is expanded by the Legendre polynomials Pl with the polar axis along ∇T0, l=2 and l=1 components are essential, respectively, for the Weibel instability and the thermal instability.View full abstractDownload PDF (556K) -
P. Mitra, P. Bhattacharyya1981 Volume 50 Issue 3 Pages 995-1001
Published: March 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe velocity distributions are obtained for the laminar flow of an incompressible viscous and electrically conducting dusty fluid due to an infinite oscillating flat plate in its plane bound with another parallel stationary plate when there is a transversely applied magnetic field. The drags on the lower and upper plates and the total volume flux of the conducting dusty fluid are obtained in closed forms. It is found that the velocities of the conducting dusty fluid and dust particles gradually decrease with the increase of the strength of the magnetic field. Also, it is noted that as the time increases, the effect of oscillation becomes less prominent.View full abstractDownload PDF (604K)