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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
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Volume 38, Issue 1
Displaying 1-50 of 59 articles from this issue
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Kwi Nam Pak, Wataru Kinase1975 Volume 38 Issue 1 Pages 1-9
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe expressions for correlation functions in pseudospin-phonon coupled system are obtained. Making use of them, the dynamic critical behaviors of the coupled system are studied theoretically for both cases that the spin ordering triggers the softening of phonon and its inverse case, in which the emphasis is placed on the coupling between pseudospin and phonon. The temperature variations of the poles on the complex plane which determine excitation modes of the system and the spectra of the correlation functions are calculated. As a result, it turns out that the strength of the coupling becomes important as the transition temperature is approached. In the case that the phonon softening causes the ordering of spin, the spectra of the phonon-phonon correlation functions in slow relaxation develop triple peaks corresponding to a relaxational central peak and two resonant phonon side peaks whose frequency shows critical softening.View full abstractDownload PDF (732K) -
Kenji Makoshi, Tôru Moriya1975 Volume 38 Issue 1 Pages 10-20
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe specific heat due to the effect of spin fluctuations in itinerant ferromagnets is calculated by using the renormalized spin fluctuation theory of Moriya and Kawabata. The calculation continuously covers all the interesting temperature ranges, both below and above the Curie temperature. The specific heat is shown to be generally enhanced in weakly and nearly ferromagnetic metals. This is particularly so at low temperatures and the effect decreases as temperature goes up far more rapidly than the previous results based on the random phase approximation which generally over-estimates the spin fluctuation effect. An anomaly around the Curie temperature turns out to be rather small.View full abstractDownload PDF (1152K) -
Hiroshi Betsuyaku1975 Volume 38 Issue 1 Pages 21-31
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe sum-rule moment method of Kadanoff and Martin has been extended to include higher-order terms and a continued-fraction representation of the generalized susceptibility has been derived. The scattering function (Remark: Graphics omitted.) based on the second-order Gaussian generalized diffusivity is essentially the same for small scattering vectors as that constructed in terms of a two-parameter Gaussian diffusivity by Tahir-Kheli and McFadden, but predicts for large scattering vectors a broad distribution in agreement with the results of the recent neutron scattering experiments on paramagnetic KMnF3 at 3.4 TN of Betsuyaku and Hamaguchi.View full abstractDownload PDF (1268K) -
Kazuo Ueda, Tôru Moriya1975 Volume 38 Issue 1 Pages 32-40
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNuclear spin-lattice relaxation rates 1/T1 in weakly antiferromagnetic metals are studied by using the renormalized spin fluctuation theory. Above the Néel temperature TN the theory predicts that 1/T1 is proportional to T⁄(T−TN)1⁄2. Below TN the importance of anisotropy and magnetostriction is pointed out and the result predicts that 1/T1 is proportional to T⁄M(T), where M(T) is the staggered magnetization. Some numerical examples based on the electron gas model with Umklapp processes are shown.View full abstractDownload PDF (1048K) -
Takehiko Hidaka1975 Volume 38 Issue 1 Pages 41-45
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe concept of the second-nearest-neighbor electron (SNE) interaction has been introduced recently to explain the piezoelectric constants and Szigeti effective charges. But the idea of SNE interaction is criticized because of the lack of warrant for actual existence of it. This paper gives the relative strength of the SNE interaction energy in diamond using the LCAO band theory of J. C. Slater. The SNE interaction energy is 42% of the ordinary chemical bond energy in diamond.View full abstractDownload PDF (544K) -
Ki-ichi Nakamura1975 Volume 38 Issue 1 Pages 46-50
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe threshold behavior of the Gunn instability is investigated. A coupled mode equation for the fluctuating electric field is reduced to a nonlinear Langevin equation that describes the stochastic motion of a single mode. The steady-state probability density for the field fluctuations is expressed in a simple exponential form, as in the case of a single mode laser. It is found that the probability density has two peaks in a region below threshold, one of which appears at the zero field and the other at a nonzero value of the field intensity. This gives rise to a hysteresis effect for the threshold behavior of the Gunn instability. The conclusion is that the Gunn instability is an example of first-order phase transitions in systems far from thermal equilibrium.View full abstractDownload PDF (608K) -
Kazuo Hattori1975 Volume 38 Issue 1 Pages 51-54
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new extension of the Lee, Low and Pines (L–L–P) method to the problem of a polaron weakly bound in a Coulomb potential and/or in a weak magnetic field is developed. The effective Hamiltonian of a polaron bound in a Coulomb potential is derived exactly to order P4. The validity of replacing P2 by [Pz2+eHh(2n+1)⁄c] in the field-free polaron energy E(P2) within the framework of the L–L–P method is shown in the limit of a weak magnetic field H along the z axis in the intermediate coupling case. The energies of a polaron in a Coulomb potential and subject to a weak magnetic field are also discussed.View full abstractDownload PDF (524K) -
Motoyuki Nomura, Hiroshi Fujiwara, Yoshito Fujiwara1975 Volume 38 Issue 1 Pages 55-60
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSVanadium concentration dependence of nuclear magnetic resonance are observed at 4.2 K for iron-rich Fe–V alloys up to 10.0 at% vanadium. On the spectra of Fe57: a satellite due to an iron atom having only one vanadium atom in its 1st nearest neighbor, was observed for each specimen. The monotonic increase of the hyperfine field at iron nuclei with the concentration of vanadium shows the contribution of negative moment polarization of the vanadium atoms. Variation of the Curie temperature with vanadium appears to be explained with a simple molecular field theory using the magnetic moment of iron obtained from the NMR observation. On the spectra of V51: the effect of the repulsion between vanadium atoms which reduces the intensity of the satellite is discussed. For 1.1 at% V alloy, a satellite which may be attributable to a vanadium having vanadium atoms located farther than the 1st nearest was newly observed.View full abstractDownload PDF (820K) -
Yoichi Kuramitsu, Jun Watanabe, Taiichiro Haseda1975 Volume 38 Issue 1 Pages 61-64
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe entropy of a model Ising spin system for CoCl2·2H2O, which consisted of 24 spins with periodic boundary conditions in two-dimensional lattice, was calculated. The cooling effect was predicted at both fields Hc1 and Hc2 in adiabatic magnetization process.
The experiment of adiabatic magnetization on CoCl2·2H2O revealed that it was really the case. Bellow 5.9 K, however, temperature variation near both Hc1 and Hc2 was not simple; heating-up was observed after passing temperature minimum. These anomalies might be attributed to the hysteresis effect of spin arrangement among the excited levels as well as ground levels.View full abstractDownload PDF (488K) -
Junji Sakurai1975 Volume 38 Issue 1 Pages 65-71
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe modified Ruderman-Kittel-Kasuya-Yosida exchange constant J(Q) of local magnetic moment interacting via the conduction electrons having energy gap at the Brillouin zone boundaries is expressed through the use of the state density and the susceptibility function of these electrons. The effects of the Brillouin zone boundary appear specially on J(0). A simple band model of conduction electrons with {100} boundaries is considered as an example. On this model, we show that the positive peak of the J(0) curve plotted against the conduction electron number n shifts, with the change of the energy gap at the boundary, to the value of n where the Fermi surface starts to fill outside the Brillouin zone boundary. We can understand on this model, for example, the change of sign of θp observed in rare earth intermetallics with Mg having the CsCl structure by taking the suitable OPW potentials for these compounds.View full abstractDownload PDF (940K) -
Toshinobu Tsuda, Hisashi Abe, Akira Hirai1975 Volume 38 Issue 1 Pages 72-80
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCo59 and Cr53 nuclear magnetic resonances (NMR) in the ordered phase of CoCr2O4 are studied. At low temperature magnetic phase, two NMR signals are observed. From the magnetic field dependences of these resonance frequencies, up to 50 kOe, the half cone angles of the ferrimagnetic spiral of this material are determined as
φCo=18°±7° and φCr=123°±4°.
It is shown that these values are consistent with LKDM theory, if the exchange interactions between distant neighbor ions are taken into account. At high temperature magnetic phase, only Co59 NMR is observed, where local moment on Co2+ ion seems parallel to the resultant moment.View full abstractDownload PDF (1228K) -
Kengo Adachi, Kiyoo Sato, Mayumi Okimori, Goro Yamauchi, Hiroshi Yasuo ...1975 Volume 38 Issue 1 Pages 81-86
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetocrystalline anisotropy of CoS2 has been measured by torque method using a single crystal and the anisotropy constants determined as K1<0 and K2\simeq0, with the easy axis of [111]. The temperature dependence of K1 is found to be proportional to the 20-th power of the thermomagnetic curve. The Co59 NMR has been studied by both CW and transient techniques in the temperature range of 4.2–77 K. The NMR spectrum is broadened by an anisotropic hyperfine interaction, and the isotropic and axial components of the hyperfine field are determined to be −59.43 kOe and −5.42 kOe at 4.2 K. The overall resonance spectrum is explained qualitatively from the domain structure with the shape anisotropy. Some discussion of the electronic origin of the magnetic anisotropy is given.View full abstractDownload PDF (856K) -
Yasunori Kubo, Nobuaki Shohata, Hironobu Fujii, Hiroshi Fujiwara, Tets ...1975 Volume 38 Issue 1 Pages 87-91
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurements of transverse magnetoresistance in hcp cobalt single crystals have been made at a temperature of 4.2 K in applied magnetic field up to 53 kOe. The transverse magnetoresistance ratio at high field is represented as a function of the magnetic induction B by ΔR⁄R=a+bBn. The value of exponent n is smaller than 1 for general field direction. A maximum value of n with valcano-like structure is observed around [11\bar20] and [10\bar10] field direction for J⁄⁄[10\bar10] and J⁄⁄[11\bar20], respectively. Also, maximums of n are observed in [10\bar10] and [11\bar20] field direction for J⁄⁄[0001] and a minimum in [0001] field direction for J⁄⁄[10\bar10] and J⁄⁄[11\bar20], respectively. From these results, hep cobalt is an uncompensated metal. The maximum and minimum are interpreted as produced by the topological properties of the Fermi surface.View full abstractDownload PDF (548K) -
Hidetoshi Miike, Kazuyoshi Hirakawa1975 Volume 38 Issue 1 Pages 92-98
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe anisotropic behavior of the magnetic susceptibility of the one-dimensional antiferromagnet KCuF3 is discussed by taking the anisotropic exchange interaction mechanism into account. The results of analysis suggest the existence of the Ising-like anisotropy in the short range order region.View full abstractDownload PDF (736K) -
Hidetaro Abe, Kei-ichi Koga1975 Volume 38 Issue 1 Pages 99-106
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn a temperature region down to 70 mK, the ESR spectra from Mn++ doped in Zn(NH4)2(SO4)2·6H2O and ZnSiF6·6H2O have been observed. Unequal intensity of the six hyperfine structure (hfs) lines within a fine structure (fs) component reflecting the polarization of Mn nuclei, gives the nuclear spin temperature, Tn, of the specimen. Only one fs component surviving at low temperatures, per one kind of ions, gives the fs constant, D, of positive sign for the former salt and that of negative for the latter. At slightly increased temperatures, lines belonging to the other fs components become observable, the intensity of which gives the electron spin temperature, Te. The thermometry using these spectra, applicable to a range down to 8 mK, is described, together with the enhancement in intensity caused by the polarization.View full abstractDownload PDF (1148K) -
Hideo Hasegawa1975 Volume 38 Issue 1 Pages 107-114
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe specific heat of nearly and weakly antiferromagnetic metals is discussed by using the renormalized spin fluctuation theory, which has been previously applied to the study of the effect of spin fluctuations on the magnetic susceptibility in antiferromagnetic metals. The coefficient of the linear specific heat enhanced by the effect of spin fluctuations, Δγ, is given as a function of α by Δγ(α)−Δγ(1)∝−|α−1|1⁄2 for both paramagnetic and antiferromagnetic phases near the critical boundary (α=2IχS0, I is the exchange interaction, χS0 the staggered susceptibility for I=0). Although the enhanced linear specific heat is predominant at low temperatures, the effect is considerably suppressed because of the renormalization of spin fluctuations as the temperature increases. Numerical calculations are presented for the free electron model with Umklapp processes.View full abstractDownload PDF (976K) -
Tomonao Miyadai, Kôichi Takizawa, Hideo Nagata, Hiroki Ito, Sy&o ...1975 Volume 38 Issue 1 Pages 115-121
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNeutron diffraction measurements have been made on two single crystals of NiS2 at low temperatures. Two types of antiferromagnetic reflections, i.e. M1 and M2, were observed. M1 corresponds to the first kind of antiferromagnetic ordering in fcc lattice and M2 to the second kind. The Néel temperature for M2 reflections, TN2, was 30±1 K, the same for two crystals, and that for M1, TN1, were 37 K and 51 K, different for two crystals. A distinct anomaly in the intensity of (002) M1 reflection, was observed at TN2. This suggests a strong correlation between M1 and M2 reflections. A spin structure is proposed, which permits the coexistence of both M1 and M2 reflections. This structure explains the observed intensities. The magnetic moment of Ni2+ obtained is considerably smaller than 2μB. Discussions are given on the proposed spin structure, and also on the mechanism for two Néel temperatures and weak ferromagnetism.View full abstractDownload PDF (816K) -
Yasuhisa Omura, Mikio Tsuji1975 Volume 38 Issue 1 Pages 122-128
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown theoretically that a surface plasma wave exists near multiples of the cyclotron frequency in a d.c. magnetic field perpendicular to the surface of a semi-infinite metal in the strong spatial dispersion region. This mode has a smaller wave number than the longitudinal bulk cyclotron wave for the same frequency. It is also shown that such a mode cannot exist if the magnetic field is parallel to the surface.View full abstractDownload PDF (788K) -
Sumiaki Nagai, Jun Kondo1975 Volume 38 Issue 1 Pages 129-136
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBased on the s-d interaction model for dilute magnetic alloys, we have calculated the resistivity as a function of temperature in the presence of an external magnetic field to the second Born approximation. The logarithmic singularity of resistivity is suppressed by the external magnetic field. For 2μH>>kBT the ln T term is replaced by ln 2μH.
Depending upon the values of parameters, the magnetoresistance is found to be either positive or negative, and the resistivity-versus-temperature curve may have either maximum or minimum, or both. The R-T curves are plotted for a wide variety of values of the exchange integrals, the spin-independent potentials and the external magnetic fields. It is also shown that the curves are classified into five patterns. The physical meaning of the obtained results is discussed.
It is suggested that the negative and positive magnetoresistances observed in impurity conduction in semiconductors are explained from our model.View full abstractDownload PDF (804K) -
Nobuo Tsuda, Toshinobu Chiba1975 Volume 38 Issue 1 Pages 137-140
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe angular correlation curve for ReO3, which is a little broader than that for WO3, was compared with the results of some model calculations. As the annihilation rates suggest that ReO3 is ionic as WO3 is, the wavefunction of 2p electrons is considered to extend more outwards in ReO3 than in WO3.View full abstractDownload PDF (496K) -
Yousuke Watanabe1975 Volume 38 Issue 1 Pages 141-149
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of the replacement of some fraction of the indium atoms with cadmium atoms on the structural stability of the long-period layer stacking sequence in Mg3In has been studied by means of X-ray and electron diffraction experiments. The observed changes in electron diffraction patterns can be described by Kakinoki’s equation and suggest that when the cadmium content is increased the stacking sequence changes from (31)3 to (11), passing through (3111)3, with increasing amount of stacking disorder, while the atomic arrangement in the close-packed plane remains unchanged irrespective of the composition. Structural changes observed in the present investigation have been found similar to the pressure effects in Mg3In previously reported. The stability of the long-period layer stacking structure is briefly discussed by application of the pseudo-potential theory.View full abstractDownload PDF (1448K) -
Kenzi Hukuda1975 Volume 38 Issue 1 Pages 150-155
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe hyperfine coupling tensor for the close protons of SeO43− in ferroelectric KDP has been determined, the principal values of which are A1=12.1 MHz, A2=−21.9 MHz and A3=−38.0 MHz. Exchange between two polar Slater configurations has been studied by observing proton and Se77 hyperfine structures in the paraelectric phase near TC. The exchange frequency obtained from the proton hyperfine structure agrees very well with that from the Se77 hyperfine structure in the whole range of the experimental temperature. The temperature dependence of the exchange frequency can be approximately represented by the Arrhenius law, where the activation energy and the preexponential factor are 0.19 eV and 4.6×1013 Hz respectively.View full abstractDownload PDF (1088K) -
Shoji Suzuki, Takehiko Ishii, Takasi Sagawa1975 Volume 38 Issue 1 Pages 156-161
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe photoabsorption spectra of 4d electrons have been measured on LaF8, LaCl3, CeF3, CeCl8, and CeBr3 as well as on metallic La and Ce. The spectra consist of two parts. One is the line structure near the threshold and the other is the broad and intense band (giant band) following the line structure. The observed features of the spectra concerning the line structure are independent of halogen and in agreement with existing atomic theoretical calculations. On the other hand, the profile of the giant band in La-halides is dependent on halogen. The 3D1 line in La-halides is found to have an asymmetric line-shape. In the measurements by photographic method using synchrotron radiation, temperature dependence of the spectra is not detected.View full abstractDownload PDF (720K) -
Yoshiro Sasaki, Chihiro Hamaguchi, Junkichi Nakai1975 Volume 38 Issue 1 Pages 162-168
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElectroreflectance of layer compound ε-GaSe is measured around 3.4 eV at 77 K and around 3.2 eV at 300 K with the Schottky-barrier technique for the modulation field F parallel to the c-axis and with the transverse electroreflectance for F⊥c, where the light is incident nearly normal to the layers. It is found from the experimental results that the structure is due to an excitonic transition at M0 critical point. The transition energy is estimated the to be 3382 meV at 77 K and 3225 meV at 300 K, and binding energy of the exciton 9 meV.View full abstractDownload PDF (976K) -
Yoshiro Sasaki, Chihiro Hamaguchi, Junkichi Nakai1975 Volume 38 Issue 1 Pages 169-174
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElectroreflectance spectra of ε-GaSe in the photon energy region 3.5–4.1 eV have been investigated at 77 K and at 300 K for F⁄⁄c with the Schottky-barrier technique and for F⊥c with the transverse electroreflectance, where the light was incident nearly normal to the layers. It was found from the Kramers-Kronig analysis of the electroreflectance spectra at 77 K that the following five transitions exist whose transition energies, broadening energies in meV, and assignments, respectively, are those in the following parentheses: (3600±10, 40±5, M1), (3700±5, \simeq20, excitonic M0), (3860±10, 100±10, M12D), (3895±10, 100±10, M12D), and (4040±10, 50±10, M1). The anisotropy of the reduced masses at the M0 and M1 critical points are found to be not so large as expected from the highly anisotropic crystal structure.View full abstractDownload PDF (824K) -
Seizo Toyotomi1975 Volume 38 Issue 1 Pages 175-180
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFar-infrared absorption spectra of uncompensated phosphorus-doped silicon with donor concentrations between 6.8×1017 and 2.0×1018 cm−3 have been measured at 6 K. These crystals show an absorption edge in the photon energy region lower than the lowest (1s→2p) excitation line of isolated phosphorus atoms. The position of this absorption energy shifts to lower energy with increasing donor concentration. The thermal donor ionization energy ε1 determined from measurements of the electrical property is situated near the low-energy threshold in the absorption cross-section spectrum, and therefore the absorption is ascribed to the ionization transition of donor electrons into the conduction band states perturbed by interactions with impurities. The absorption cross-section spectrum shows no anomaly at the photon energy equal to the thermal activation energy ε2, which is characteristic of the intermediate concentration range of impurity conduction.View full abstractDownload PDF (760K) -
Satoru J. Miyake1975 Volume 38 Issue 1 Pages 181-182
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn the strong-coupling limit, the polaron ground state energy has been known to be proportional to α2, α being the electron-phonon coupling constant. The coefficient of proportionality is found by numerical calculation to be 0.108513 in an appropriate unit. Pekar’s variational function is found to give an excellent approximate solution; the energy differs by less than 0.01%, and the error in wave function is less than 1% where the value of the wave function is appreciable.View full abstractDownload PDF (252K) -
Hiromoto Uwe, Tunetaro Sakudo1975 Volume 38 Issue 1 Pages 183-189
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe dielectric constant of KTaO3 has been measured as a function of the applied uniaxial stress normal to the (100), (110) and (111) faces. Under the stress normal to (100) or (110), the induced ferroelectric phase transition has been observed at liquid-helium temperatures. From the analysis of the stress dependence of the dielectric constant in the paraelectric phase, the electrostrictive constants for this crystal have been determined as Q11=9.69±0.7, Q12=−2.55±0.2 and Q44=3.3±2.6 in 10−13 cgs at 4.2 K. Their magnitude was found to decrease at the rate of 8×10−4 in 10−13 cgs/K with increase of temperature. Characteristics of the dielectric constant in the stress-induced ferroelectric phase are also discussed.View full abstractDownload PDF (748K) -
Yukio Kazumata, Sohichi Kato, Yoshibumi Ueda, Masato Nishi1975 Volume 38 Issue 1 Pages 190-194
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new paramagnetic center, which is a linear tri-atomic molecular ion of [FCsF]0, has been observed in a γ-irradiated CsF crystal at LNT. The center has a ⟨100⟩ symmetry axis, and decays at 115 K. The parameters in the spin hamiltonian are determined from experiments. It is concluded that the hole trapped by the tri-atomic molecular ion has almost the same density at the three nuclei; F, Cs and F nuclei.View full abstractDownload PDF (544K) -
Hiroyasu Shimizu, Makoto Tsukamoto, Yoshihiro Ishibashi, Yutaka Takagi1975 Volume 38 Issue 1 Pages 195-201
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNine photoelastic constants of NaNO2 related to the longitudinal phonons have been determined at room temperature from the Brillouin scattering measurements as follows: |P11|=0.44, |P12|=0.37, |P13|=0.36, |P21|=0.39, |P22|=0.33, |P23|=0.27, |P31|=0.18, |P32|=0.19 and |P33|=0.15.
By taking into consideration the rotational effect, the contribution of homogeneous strain to fifteen photoelastic constants have been calculated on the basis of the point dipole interaction, where Na ions and O ions are assumed to be electronically polarizable. These results are compared with those of experiments.View full abstractDownload PDF (792K) -
Noboru Sato1975 Volume 38 Issue 1 Pages 202-207
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe lattice strain induced by the diffusion of phosphorus or boron in the (111) surface of silicon was studied by means of the intensity measurement of X-ray diffraction. In specimens with surface concentrations of phosphorus 6×1019 to 1.5×1021 cm−3 or boron 6×1018 to 1.2×1020 cm−3, the diffusion-induced strains were observed to extend in the range of 350∼700μ from the surface. The lattice strain at distance D from the surface can be expressed by ε=ε0exp(−αD), where ε0 is the maximum strain induced by the diffusion and depends on the surface impurity concentration and α is a constant of about 100 cm−1 for specimens with large dimension, ≥1 mm in thickness.View full abstractDownload PDF (1332K) -
Mel Fehlmann, Isao Fujimoto1975 Volume 38 Issue 1 Pages 208-215
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe absolute value of the ‘forbidden’ (222) structure amplitude of silicon is measured by the Pendellösung method. Traverse topographs from a wedge-shaped, dislocation-free crystal are obtained at room temperature, using Cu Kα1 radiation from a rotating anode generator. From the position of the first maximum of thickness fringes the F(222)e−M value is derived as 1.645±.034.View full abstractDownload PDF (956K) -
Masayoshi Koike, Hiroshi Sato, Tsutomu Watanabe1975 Volume 38 Issue 1 Pages 216-223
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFano-Lichten’s electron promotion model is applied for the cases of C+–C and N+–N collisions. More improved computations than the previous paper [T. Watabe et al.: J. Phys. Soc. Japan 34 (1973) 781] are carried out for the calculations of the orbital energies, the interaction matrix elements, the classical trajectories and the differential equations. The results are compared with the experimental ones. For C+–C, the agreement is satisfactory in the present status of experimental research. For N+–N, the relative energy dependence of the cross sections is in good agreement with experiments, but the absolute value is about 3 times greater than that of experiment. Discussions are made for the applicability of the scaling law.View full abstractDownload PDF (1004K) -
Takako Shinoda1975 Volume 38 Issue 1 Pages 224-230
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe have examined to give a molecular potential for silicon tetrafluoride which describes accurately the interactions between molecules. It was found that the spherical interaction of the Lennard-Jones form and the electrostatic octopole-octopole interaction between neighboring molecules fails to explain the various physical properties of SiF4, whereas an addition of anisotropic Lennard-Jones potentials between nonbonded atoms gives a satisfactory account of these properties. The value of the potential parameters is evaluated and discussed by comparing with experimental data.View full abstractDownload PDF (844K) -
Shun-Ichi Kishimoto, Yoshihide Yamamoto, Hideo Akimune, Tokuo Suita1975 Volume 38 Issue 1 Pages 231-238
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFlute instability is studied theoretically from the point of view of the non-linear interaction of charged particles with an inhomogeneous high frequency field whose electric field component is parallel to the confining magnetic field. The reciprocal action between the high frequency field and the instability is supposed to occur as a result of the particle motions induced by the field parallel to the wave number vector of the instability wave. The two effects of the field are found out; one is attributed to the electron drifts motivated by a quasi-potential derived from the high frequency field and the other is owing to the induced periodic displacement of ions or electrons. The instability is stabilized by the electron drifts whose velocities are nearly equal to or larger than those of ions driving the instability and moreover may be effectively stabilized by the above additional periodic displacements of ions or electrons oscillating with their cyclotron frequencies. These displacements are excited by the high frequency field whose frequency is resonant to half the ion or electron cyclotron frequency.View full abstractDownload PDF (972K) -
Yoneyoshi Kitagawa, Shigetoshi Tanaka1975 Volume 38 Issue 1 Pages 239-245
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn an ECRH plasma, the electron density can be modulated by modulating the microwave power to produce the plasma. It is shown that a collisional drift wave is excited by modulating the electron density of the plasma in a marginally unstable region. When the spontaneous excitation of the instability arises, its dynamic and feedback stabilizations are carried out by the density modulation whose frequency is around that of the instability. As the instability is stabilized, the ion loss flux across the magnetic field is observed to decrease.View full abstractDownload PDF (1016K) -
Yoneyoshi Kitagawa1975 Volume 38 Issue 1 Pages 246-251
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe excitation, dynamic and feedback stabilizations of a collisional drift instability by means of the electron density modulation around its frequency are analyzed systematically by using nonlinear fluid equations for ions and electrons, where mode coupling effects are considered. The theoretical treatments are extended from the finite-amplitude collisional drift wave theory described by Stix. Comparison between these results and the experimental observations on the excitation and stabilizations of the drift instabilities shows qualitative agreement.View full abstractDownload PDF (780K) -
Hiroyuki Miura1975 Volume 38 Issue 1 Pages 252-256
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe flow field behind an attached shock wave produced by a wedge fixed in a uniform stream of a gas containing small dust particles is examined theoretically by a perturbation method. The shock wave causes a deviation from an equilibrium state and bends downstream as a result of interaction with Mach waves. Far downstream an entropy layer is formed near the surface of the wedge, across which the pressure is constant but other flow variables change appreciably. Numerical values of the temperature and the pressure of the gas are given for a few cases showing that these variables take then maximum in the relaxation region next to the shock wave.View full abstractDownload PDF (492K) -
Masakazu Tatsuno1975 Volume 38 Issue 1 Pages 257-264
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe steady flow generated by an oscillating triangular cylinder immersed in a viscous, incompressible fluid is investigated experimentally. When an equilateral triangular cylinder is oscillated perpendicularly to one of its sides, the flow pattern in the vicinity of the cylinder is symmetric with respect to the axis of oscillation but asymmetric with respect to the axis perpendicular to it. The flow patterns are classified into two types on the basis of the values of two non-dimensional parameters, r0\sqrtω⁄ν and s⁄r0, where r0 is half the side length of the cylinder section, ω the angular frequency, ν the kinematic viscosity and s the oscillation amplitude. On the other hand, when the triangular cylinder is oscillated parallel to one of its sides, the flow pattern is asymmetric with respect to the axis of oscillation but symmetric with respect to the axis perpendicular to it. The flow patterns are classified into three types.View full abstractDownload PDF (2272K) -
Takuji Kawahara1975 Volume 38 Issue 1 Pages 265-270
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe derivative expansion method is applied to an investigation of the weakly nonlinear self-interactions of capillary-gravity waves on a liquid layer of uniform depth. The stability characteristics of a wave train are examined on the basis of the nonlinear Schrödinger equation. It is shown that the effect of capillarity is of critical importance to the modulational instability.View full abstractDownload PDF (612K) -
Tsutomu Kambe, Yuko Oshima1975 Volume 38 Issue 1 Pages 271-280
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDecay of a vortex ring in a viscous fluid is discussed by using a solution in the form of an asymptotic expansion for large time t. It is found that the velocity of the vortex ring varies as t−1.5 in the final state of low Reynolds number. The asymptotic expansion is not uniformly valid, and an improvement is made by using the method of matched asymptotic expansions.
Generation and development of vortex rings are simulated by numerical integration of the Navier-Stokes equation as an initial and boundary value problem. Time variations of physical quantities such as total energy, impulse and velocity of the vortex rings, etc. are obtained, and have been shown to approach asymptotically to those obtained from the asymptotic expansion. Comparison with experimentally produced vortex rings is also given briefly.View full abstractDownload PDF (1168K) -
Yoshie Matsuo, Kinya Katada1975 Volume 38 Issue 1 Pages 281
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
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Takeshi Saito1975 Volume 38 Issue 1 Pages 282
Published: January 15, 1975
Released on J-STAGE: June 01, 2007
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M. N. Ghatikar, Junkichi Itoh1975 Volume 38 Issue 1 Pages 283
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
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Akio Mishima, Hironobu Fujii, Hiroshi Fujiwara, Tetsuhiko Okamoto1975 Volume 38 Issue 1 Pages 284
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
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Shinji Kawano, Norio Achiwa1975 Volume 38 Issue 1 Pages 285
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
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Kiyoichiro Motoya, Hiroshi Yasuoka, Yoji Nakamura, J. P Remeika1975 Volume 38 Issue 1 Pages 286
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
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Kazuaki Fukamichi, Hideo Saito1975 Volume 38 Issue 1 Pages 287
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
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Kazuko Kubo1975 Volume 38 Issue 1 Pages 288
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
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Toshihiko Taki, Mitsuo Satoh1975 Volume 38 Issue 1 Pages 289
Published: January 15, 1975
Released on J-STAGE: May 29, 2007
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