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Tokushi Shibata, Hiroyasu Ejiri, Hirokane Kawakami, Hideshige Kusakari ...
1973 Volume 35 Issue 3 Pages
633-642
Published: September 05, 1973
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Low-lying excited states in a neutron magic nucleus
143Pm, were studied by investigating γ-rays and conversion electrons following
141Pr(α, 2n)
143Pm and
148Nd(p, 6n)
143Pm reactions. The 272 keV 7/2
+, 960 keV 11/2
− and 1057 keV 3/2
+ levels were confirmed and the 1664 keV (13/2
−) and possibly 2053 keV levels were found. The γ-transition scheme for these levels were obtained. The half-life of the 960 keV state was measured as 26.0±2.0 ns. The following reduced transition probabilities were obtained; B(M2, 960 keV 11/2
−→272 keV 7/2
+)=10.5±0.8 fm
2 (
eh⁄2 Mc)
2, and B(E3, 960 keV 11/2
−→ground state 5/2
+)=(1.01±0.09)×10
4e
2fm
6. The effective M2 and E3 coupling constants are
gM2eff=0.235
gM2SP and
gE3eff=4.0
gE3SP. These values suggest a reduction of the M2 transition due to a destructive effect of the spin-isospin core polarization and an enhancement of the E3 transition due to a constructive effect of the octupole core polarization.
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Masahiro Inoue, Eiichi Hanamura
1973 Volume 35 Issue 3 Pages
643-653
Published: September 05, 1973
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For the metallic state of an electron-hole gas, the average energy per an electron-hole pair and the pair correlation functions are calculated beyond the random phase approximation by taking into account the effects of the exchange and the electron-hole scattering corrections. Here we introduce a variational method, in which the Fourier components of the correlations between any kinds of particles are chosen as the variational parameters for each value of the wave vector. These parameters are determined by minimizing the total energy calculated in r.p.a. On the basis of the results in r.p.a., exchange and scattering corrections are evaluated by perturbational method.
As a result, the applicability of our results is extended to the concentration region as low as
rs\simeq2. The results of our calculation show that the minimum of the average energy amounts to
Eg−1.00
Eexb at
rs\simeq2 and that the effects of the scattering correction between electrons and holes are fairly large even in the metallic system.
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Éi Iti Takizawa, J. Meixner
1973 Volume 35 Issue 3 Pages
654-660
Published: September 05, 1973
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The theory of linear relaxation systems of the first and the second kind is generalized to the vector-values case. A slightly different approach from that given by Zemanian is made. A few theorems on special classes of linear relaxation systems, whether scalar or vector-valued, are stated. A few examples are discussed in detail.
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Ikuo Ono, Yoshikazu Endo
1973 Volume 35 Issue 3 Pages
661-668
Published: September 05, 1973
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The ground state for
S0=1 and the low-lying excited states including localized states for
S0=1⁄2 of a linear Heisenberg ferromagnet of spin 1/2 containing an antiferromagnetic impurity spin are calculated, where
S0 is a magnitude of the impurity spin. In these cases they belong to the subspace spanned by the two spin deviation kets. The two magnon states are solved. The method is based on the excitation from the rigorous one magnon localized state. The wave functions and the averages of the
Z component of each spin are calculated. Numerical calculations for a ring consisting of twelve spins are performed. The results are in good agreement with analytical results for the ground state energy and localized levels.
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Tôru Moriya, Arisato Kawabata
1973 Volume 35 Issue 3 Pages
669-676
Published: September 05, 1973
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The theory of the effect of spin fluctuations on itinerant electron ferromagnetism, which we have developed previously, is extended to include the ferromagnetic phase. The correction to the Hartree-Fock free energy as a function of magnetization is expressed in terms of the transversal dynamical susceptibilities and is actually calculated by using a modified random phase approximation for the dynamical susceptibilities; the random phase approximation is modified so as to give a consistent static limit throughout the whole temperature range covering both below and above the Curie point. As a result, the magnetization at low temperatures shows a
T3⁄2 dependence due to the spin wave excitations, the Curie temperature is generally lowered from the Stoner (Hartree-Fock) value and the magnetic susceptibility above the Curie temperature shows an approximate Curie-Weiss behavior.
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Shin-ichi T. Inoue, Jiro Yamashita
1973 Volume 35 Issue 3 Pages
677-683
Published: September 05, 1973
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Band structure of metallic Be is calculated at various values of the lattice constants with proper emphasis on the deviation from the free electron model. It is found that Be keeps to be a metal up to the lattice constant by 1.6 times as large as the normal lattice. The density-of-states at the normal lattice has a deep valley at the Fermi energy. The charge distribution of conduction electrons in the real space is more concentrated along a line connecting the atoms in the direction of the
c-axis. There seems to be a kind of the energy separation between a bonding and an anti-bonding orbitals due to a strong hybridyzation of
s and
p wave functions. The calculated value of the coefficient of the electronic specific heat is 0.145 mJ/mole·deg
2, while the observed value is 0.171 mJ/mole·deg
2, so that the enhancement factor is determined as 0.18. The calculated dimensions and the shape of the Fermi surfaces agree well with experiment.
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Nobuhiko Sawaki, Tetsuya Arizumi
1973 Volume 35 Issue 3 Pages
684-690
Published: September 05, 1973
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The theory of tunneling into an impurity band across a junction is developed by using the self-consistent Green’s function in a ramdom array of impurity potential. If a short range potential is assumed for the impurity potential, the tunneling current density is expressed in terms of the proper self-energy
Σ and the first and second derivatives of the current with respect to applied voltage are obtained.
The results are examined numerically and it is shown that d
2J⁄d
V2−
V curve should have a structure around the energy gap between the impurity band and the main band. In the impurity band, the d
J⁄d
V−
V curve reflects the influence of Im
Σ, while in the main band region it reflects the parabolic behaviour of the density of states because of the smaller contribution of Im
Σ.
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Kêitsiro Aizu
1973 Volume 35 Issue 3 Pages
691-695
Published: September 05, 1973
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Let
y and
Y denote a given component of electric polarization vector or mechanical strain tensor and the corresponding component of electric field vector or mechanical stress tensor, respectively. Let
nM and
nF denote the faintness index for ferroelectricity or ferroelasticity of the soft vibrational modes and of the ferroic phase with respect to the component
y. Cases of
nM<
nF≤∞ are considered in a general way and also with examples. How
ys (s is the initial of “spontaneous”) varies with temperature depends only on
nF and not on
nM; the way of dependence on
nF is essentially the same as when
nF=
nM. On the other hand, how the susceptibility (d
y⁄d
Y)
s varies with temperature is not necessarily independent of
nM; it can be essentially dissimilar to that when
nM=
nF.
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Seizo Watarai
1973 Volume 35 Issue 3 Pages
696-705
Published: September 05, 1973
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The spin-wave theory is developed for the study of the acoustic soft-magnon modes in hematite (α-Fe
2O
3). The energies ω
0 of the soft-modes are approximately given as ω
0∞|
TM−
T|
1⁄2 near the Morin phase transition temperature
TM and the results are compared with the AFMR experiments.
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Shigehiro Komura, Takayoshi Takeda, Soji Ohara
1973 Volume 35 Issue 3 Pages
706-711
Published: September 05, 1973
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Neutron diffuse scattering around the (111) Bragg peak from a single crystal of Fe–Ni alloy with 35 atomic percent nickel concentration has been measured. Magnetic contributions are extracted from the diffuse scattering by varying temperature from room temperature up to 450°C. The intensities of the scattering are best fitted with gaussian distribution in a form exp[−0.693(
q⁄κ)
2], where
q is a distance from (111) point in the reciprocal space. The inverse correlation range κ as a function of temperature is determined; κ is nearly constant with the value κ=0.11A
−1 below
Tc and gradually decreases with temperature above
Tc down to the value κ=0.07A
−1 at 100 degrees above
Tc. A model which takes into account a fluctuation of the magnetic correlation range is proposed and discussed for the invar alloy.
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Shigeaki Takajo, Shun-ichi Kobayashi, Wataru Sasaki
1973 Volume 35 Issue 3 Pages
712-715
Published: September 05, 1973
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Superparamagnetism is observed in Ni fine particles prepared by the gas evaporation technique. The observed temperature and magnetic field dependence of the magnetization is explained by taking the magnetic interaction between particles into account. The particle sizes deduced from the magnetization agree with those observed in the electron micrographs.
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Yoshiyuki Watanabe
1973 Volume 35 Issue 3 Pages
716-721
Published: September 05, 1973
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FMR measurements at 9.3 GHz have been made on single crystal disks of manganese ferrites with resistivities of the order of 0.1
Ωcm (300 K), for various values of thickness. Comparison of the data with calculated absorption formulae indicates that an appreciable influence of skin depth effect remains until the thickness becomes as small as about 40 μm. This means that spherical samples are unsuitable for the examination of intrinsic relaxation mechanism in excess-iron ferrites. For samples with thickness of 15∼22 μm. the temperature dependence of linewidth does not exhibit a peak in a temperature region from 77 to 300 K, quite different from that for spherical samples, but shows a gradual increase below ∼150 K which can be described in terms of the slow relaxation mechanism.
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Hironobu Ikeda, Kinshiro Hirakawa
1973 Volume 35 Issue 3 Pages
722-728
Published: September 05, 1973
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In order to examine the universal nature in quasi-one-dimensional magnetic system, a detailed neutron-diffraction investigation of the magnetic properties of antiferromagnet KCuF
3 has been carried out. A qualitative analysis of the wave-vector-dependent susceptibility above the Néel temperature has been performed near the (001) position in reciprocal space. The topological features of the (001) diffuse peak were utilized to ascertain the one-dimensional nature and the relative values of
Jc and
Ja, intra- and interchain exchange interaction, respectively. On applying a resolution-correction procedure we obtain
Ja⁄
Jc=0.027±0.005 at 39.800 K. On the other hand, below
TN the sublattice magnetization is found to follow the power law
MT⁄
M0=
D(1−
T⁄
TN)
β, with
D=1.53±0.05,
TN=39.51±0.02 K and β=0.355±0.010, for the temperature interval 0.001<
TN−
T⁄
TN<0.1. The exponent β is in excellent agreement with the three-dimensional spin-half isotropic Heisenberg value 0.354. And for
T⁄
TN<0.65 the temperature variation of sublattice magnetization is found to follow the
T2-law.
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Youichi Nakamura
1973 Volume 35 Issue 3 Pages
729-733
Published: September 05, 1973
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Magnetic susceptibility, NMR and thermoelectric power measurements on dilute Ag–Gd alloys are done in temperature regions of 2 K–300 K, 4.2 K–300 K and 2 K–35 K, respectively. The effective
Js−f value is derived from the impurity contribution to the
109Ag NMR line widths as |
Js−f|=0.28±0.03 eV. This value is consistent with that from the specific heat experiment, but considerably larger than that from magnetoresistance. Temperature dependence of the thermoelectric power is nearly independent of concentration and no anomalous peak is observed down to 2 K.
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Hisashi Takenaka, Kunisuke Asayama
1973 Volume 35 Issue 3 Pages
734-739
Published: September 05, 1973
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NMR signals of Mn
55 in antiferromagnetic γ Mn alloys have been observed in liquid helium temperature range. The internal field in pure γ Mn metal is estimated to be 65.2 kOe. This is small from the consideration of the magnetic moment of 2.4 μ
B. A satellite signal appears at the field of about 95 kOe which is independent of the species of the impurity atom in the dilute alloys. The small internal field suggests that a large positive contribution is needed to compensate a large negative core polarization term. The appearance of one satellite at a higher frequency than the main line indicates that the compensation is the property of the Mn atom itself and the effect of the impurity atom is well limited to its nearest neighbors. This concept is useful also to explain the internal fields in the γ Mn alloys of high concentration range.
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Hisashi Takenaka, Kunisuke Asayama
1973 Volume 35 Issue 3 Pages
740-744
Published: September 05, 1973
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The NMR signals of Mn
55 in antiferromagnetic b.c.c. Cr–Mn alloys have been observed in liquid helium temperature range. The internal field of Mn
55 decreases with the concentration of Mn from 62.3 kOe to 39.0 kOe. It seems that the magnetic moment of Mn decreases. The nuclear spin-lattice relaxation of Mn
55 is explained by the same mechanism as that in paramagnetic b.c.c. transition alloys, Ti–V, V–Cr, V–Mn.
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Kunio Aiki, Koziro Narita, Motoko Tanabe
1973 Volume 35 Issue 3 Pages
745-749
Published: September 05, 1973
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The electron spin resonance of Tb
3+ and Pr
3+ ions in La
2O
2S single crystals in investigated. The symmetry of the centers were determined with the help of crystal structure considerations. Models for these centers are proposed and the electronic structures of the ground state are discussed. For the Tb
3+ ion, there are two types of centers, the symmetry of which are characterized by
C3v and
C1h, whereas only one type of center with
C3v symmetry was observed for Pr
3+ ion.
The centers having
C3v symmetry are considered to be Tb
3+ and Pr
3+ ions which are substituted for La
3+ ion in the host crystal. The line shape is asymmetric, probably due to the dynamical Jahn-Teller effect of non-Kramers doublet.
The center with
C1h symmetry is supposed to be the Tb
3+ ion which is substituted for the La
3+ ion with some defect at the nearest sulphur site.
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Saburo Takamura, Shigeo Okuda
1973 Volume 35 Issue 3 Pages
750-753
Published: September 05, 1973
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The recovery structures of Nb and V after fast neutron irradiation near liquid helium temperature are determined. The effects of radiation doping, impurity doping and deformation before the low temperature irradiation on the recovery stages are investigated. Impurities appear to suppress the recovery stage at 45 K (the 45 K stage) and enhance the 70 K stage for Nb and similarly suppress the 50 K stage and enhance the 72 K stage for V. The enhancement of stage I by radiation doping at room temperature was observed in Mo and W in the previous experiments, but it is not seen in Nb and V. These results suggest the following temperature ranges for the recovery stages: stage I (below 50 K) and stage III (∼220 K) for Nb, and stage I (below 60 K) and stage III (∼170 K) for V.
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Kiyotomo Ozawa, Shoichiro Koide
1973 Volume 35 Issue 3 Pages
754-759
Published: September 05, 1973
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A calculation is made for the multi-magnon side-band recently observed by Hirano
et al. on FeBO
3. The change in the coupling constants between Fe
3+ spins due to the exciton creation is treated as the final state interaction. The perturbation expansion is adopted with respect to the change expressed in terms of magnon operators. The general features of the observed spectrum can be well accounted for by assuming appropriate values for some parameters introduced in the calculation.
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Satya Pal
1973 Volume 35 Issue 3 Pages
760-766
Published: September 05, 1973
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The temperature variation of the electrical resistivity of the alkali metals has been studied within the free electron approximation on the basis of the lattice dynamical model of de Launay. The force constants appearing in the secular equation for the lattice vibrations have been estimated by using the experimental values of the elastic constants of alkali metals. The phonon spectrum has been calculated with the help of the modified Houston’s spherical six-term procedure as developed by Betts
et al. Bardeen’s matrix elements for the scattering of free electrons have been incorporated into the variational expression developed for the Boltzmann transport equation. The theoretically calculated resistivity values of the alkali metals, except for lithium, are in reasonable agreement with the experimental data.
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Setsuro Asano, Jiro Yamashita
1973 Volume 35 Issue 3 Pages
767-775
Published: September 05, 1973
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Electronic structures of Ca and Sr under high pressure are investigated by KKR method with four different types of the self-consistent potential: the Hartree-Fock-Slater, the approximate Averaged-Hartree-Fock and the other two potentials. In the HFS potential the relative position of the
d-band is somewhat too low, so that it predicts the metal-semimetal transition at
V⁄
V0≈0.84 for Ca, and Sr as semimetal already at normal pressure. On the other hand, the AHF potential predicts that the metal-semimetal transition occurs at
V⁄
V0≈0.65 for Ca, and at
V⁄
V0≈0.88 for Sr. The theoretical prediction is in good accord with experiments. At normal pressure, the Fermi energy is found to be just near the top of the density-of-states rather than at the valley of it, and the Fermi surfaces consist of a first zone monster and second zone caps, as was first proposed by Harrison.
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Shugo Kubo, Kengo Adachi
1973 Volume 35 Issue 3 Pages
776-783
Published: September 05, 1973
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The origin of formation of the one- and two-dimensional long period superlattices appearing in Cu–Pd and Cu–Pt systems has been made clear, basing upon the short range interaction due to the repulsive energy of ion cores and the long range interaction produced from band electrons in the alloys. The stability conditions for the normal superlattice and the one- and two-dimensional long period superlattices were confirmed in terms of the electron number per atom, and the concentration dependence of half period for the long period superlattices was obtained. These results well explain the experimental results. Some remarks on the effects of superlattice Brillouin zone were given.
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Tadao Ishii
1973 Volume 35 Issue 3 Pages
784-787
Published: September 05, 1973
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The attenuation (amplification) coefficient of the acoustic waves interacting with conduction electrons in an anisotropic medium is obtained with the aid of the energy conservation law. The resultant formula is applicable to on-axis as well as off-axis attenuation of the sound and predicts an effect of the longitudinal magnetic field on acoustic amplification. The formula is extended to the case of multiple carriers,
e.g., electrons and holes, or carriers from valleys, where its dependence on the conductivity tensor differs from that in the case of deformation potential coupling.
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Keigo Nagasaka, Shin-ichiro Narita
1973 Volume 35 Issue 3 Pages
788-796
Published: September 05, 1973
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Studies have been made on photoconductivity spectra of germanium doped with antimony of 3.1×10
13∼2.1×10
16 cm
−3 in the photon energy region 5∼13 meV. The temperature and impurity concentration dependence shows that the spectra consist of two components; one of which is due to the photo-thermal ionization of donor electrons to the conduction band, and the other is structureless and temperature-independent one. The latter extends widely in the energy range less than 10.19 meV (the ionization energy of the isolated donor). The ratio of the photoconductivity response less than 10.19 meV to the response at 10.19 meV at 1.6 K increases with donor concentration. These results suggest that a second mechanism for the far-infrared photoconductivity exists other than the photo-thermal ionization of donors and is ascribed to the formation of reduced ionization energy states due to the interaction of impurities. The photo-Hall mobility spectra of electrons which contribute to the latter photoconductivity mechanism were also measured.
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Keigo Nagasaka, Shin-ichiro Narita
1973 Volume 35 Issue 3 Pages
797-805
Published: September 05, 1973
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In order to seek the origin of far-infrared photoconductivity responses in doped germanium, observed in the energy region less than the ionization energy of the isolated donor, the effects of the donor assemblies have been studied. The donor assemblies are assumed to be composed by two or three impurity atoms in the lattice sites, separating from each others in distance of several times of the effective Bohr radius of the donor. The ground state energies of electrons in neutral donor assemblies and those of electrons in donor assembly ions (+) are calculated by the LCAO method. The ionization energy of the electron of the donor assembly is obtained to be smaller than that of the isolated donor.
Assuming the random distribution of donors, photoconductivity spectra of the donor assembly have been theoretically looked for, and a qualitative agreement between the calculation and the experiment was obtained. The photo-response extended to the appreciably low energies in the photoconductivity spectra is ascribed to the electron transition from the donor assemblies with reduced ionization energies to the conduction band.
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Kazuaki Tsuchida, Ryuji Abe, Masataka Naito
1973 Volume 35 Issue 3 Pages
806-809
Published: September 05, 1973
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ESR spectra of γ-irradiated KDP were measured at both X- and K-bands. The radical was ascertained to be ·OPO
3H
− which resulted from the loss of a hydrogen atom from a H
2PO
4− ion. The principal values of
g-tensor of the radical were determined to be 2.054, 2.007 and 2.003, and those of
A-tensor to be 36.8, 33.8 and 33.0 Gauss. From the analysis of the anisotropic
g-tensor, it was concluded that the PO
4 tetrahedron in the radical was rotated by about 13° around the
c-axis from the original position. The spectrum for the irradiated DKDP can be explained consistently with the present result if the unpaired electron is distributed equally on four oxygens.
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Uichi Itoh, Katsuji Takeishi, Hiroyuki Anzai
1973 Volume 35 Issue 3 Pages
810-813
Published: September 05, 1973
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Electrical conductivity and activation energy were measured in doped-anthracene crystals and a highly purified anthracene crystal in a temperature range from 370 K to 420 K. It was found that the conductivity was proportional to the concentration of impurity molecules. Main carrier generation process in the dark conduction was deduced to be an extrinsic bulk generation associated with impurity molecules. Other mechanisms such as intrinsic generation or carrier injection from electrodes were denied.
The conductivity and the activation energy were respectively 1.63 eV and 1.4×10
−17 ohm
−1cm
−1 at 400 K in the direction perpendicular to the ab-plane of the purified anthracene crystal. It has not been reported that the conductivity lower than the above value has ever been observed.
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Yoshihiro Ishibashi, Yutaka Takagi
1973 Volume 35 Issue 3 Pages
814-817
Published: September 05, 1973
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The validity of previous entropy calculations on STHS is reexamined from the view points of crystal symmetry. The approximate entropy
k·ln(5⁄4) per one molecule, expected on the Makita conditions, is too small as compared with the experimental data. It is shown that the results of the previous calculations based upon an implicitly loosened condition are applicable to STHS if a suitable transference of bond assignment is admitted.
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Masayuki Tsukioka, Hironao Kojima
1973 Volume 35 Issue 3 Pages
818-821
Published: September 05, 1973
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Electron spin resonance in synthetic phenacite (Be
2SiO
4), single crystals doped with Cr
2O
3 was observed at 1.2 K at about 9.1 GHz with
gz(eff)=1.2615±0.0004,
gx(eff)=1.5686±0.0002, and
gy(eff)=5.4881±0.0009, and the hyper-fine coupling constant
A=20.5±0.8G.
It is proved that this spectrum is attributed to Cr
3+ located at the Be or at the Si sites of tetrahedral coordination.
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Tyuzi Ohyama, Toshi Sanada, Eizo Otsuka
1973 Volume 35 Issue 3 Pages
822-825
Published: September 05, 1973
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Through time-resolved analysis, it has been concluded that the linewidth of cyclotron resonance for electrons in pure silicon crystal for a certain short interval of time after strong photo-excitation is primarily determined by interaction with isolated excitons. In combination with the work by Cuthbert, the magnitude of electron-exciton interaction is estimated. It lies between those of electron-neutral donor and electron-neutral acceptor interactions.
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Hajime Hattori, Masayoshi Umeno, Takashi Jimbo, Osamu Fujitani, Shichi ...
1973 Volume 35 Issue 3 Pages
826-831
Published: September 05, 1973
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A study on the anisotropy of the photon drag effect in
p-type germanium confirms that the effect is adequately described by the fourth-rank photon drag tensor. The two independent components
S and
P of this tensor as functions of temperature and hole concentration have been determined. These values disagree with those obtained by Walker and Tilley [A. C. Walker and D. R. Tilley: J. Phys. C
4 (1971) L376]. The experimental results of the longitudinal and transverse photon drag fields are in good agreement with the description of the photon drag tensor. A computer analysis predicts that the maximum longitudinal photon drag effect occurs for a radiation with propagation along [110] and polarization along [\bar110], while the maximum transverse photon drag voltage appears in [11\bar3] when the radiation propagates along [332] with a [\bar110] polarization. Mechanisms for a transverse photon drag are discussed briefly.
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Chihiro Hamaguchi
1973 Volume 35 Issue 3 Pages
832-841
Published: September 05, 1973
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A generalized expression for the Brillouin-scattering cross-section is obtained by incorporating birefringence in hexagonal crystals. Scattering cross sections of any case can be calculated from the formula when the mode and propagation direction of the acoustic waves, and the polarization direction of the incident light are known. The formula derived in the present paper is very useful to analyze the spectrum of phonons amplified through acoustoelectric interactions in hexagonal crystals like CbS. The Brillouin cross sections are evaluated for the scattering by the transverse and longitudinal acoustic waves with the propagation directions parallel and perpendicular to the
c-axis. The cross section is found to depend on the frequency of the acoustic waves for example in the case of the scattering by the transverse acoustic waves with the polarization vector parallel to the
c-axis and the propagation direction perpendicular to the
c-axis. The effect of multiple internal reflections is also taken into account.
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Nobuo Niimura, Yasuhiko Fujii, Hiroshi Motegi, Sadao Hoshino
1973 Volume 35 Issue 3 Pages
842-847
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Neutron diffraction measurements of DCl using a single crystal revealed that such an anomalous transition as observed in the higher temperature cubic phase of HCl did not occur. Mean square angular displacements due to the molecular libration of DCl were obtained from anisotropic temperature factors of deuterium atom. Their temperature variation showed a rapid increase in the rate of the 60° molecular flipping with increasing temperature. The difference of the molecular motion between DCl and HCl was observed, which could not be explained by a simple harmonic oscillator model.
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Hiroki Nakamura
1973 Volume 35 Issue 3 Pages
848-853
Published: September 05, 1973
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An energy dependent separable potential is used to approximate the energy dependent non-local potential which results from the partitioning technique in atomic collision theory. By extending the Heitler approximation and employing this separable potential, a new cross section formula is obtained. The formula is applied to a two-state square well problem and proves to be better than other existing formulas.
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Jinya Otsuka, Osamu Matsuoka, Nobuko Fuchikami, Yasunobu Seno
1973 Volume 35 Issue 3 Pages
854-860
Published: September 05, 1973
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Calculation is carried out for all the triplet and quintet states arising from the low lying terms of the ferrous heme iron atom and those of the oxygen molecule. The charge transfer configurations of ionic structures, Fe
3+–O
2− and Fe
+–O
2+, are also taken into account. The results are compared with those for the singlet and septet states calculated previously. If the value of an unknown splitting energy between
u and υ orbitals is estimated to be 4,000 cm
−1 or more, the singlet state composed mainly of
3E and
3Σ
g− terms (triplet-triplet binding) becomes the lowest in energy at short distances between the heme and the oxygen molecule. Thus, the diamagnetism of oxyhemoglobin can be explained theoretically on the basis of the electronic structures of the hemes determined by the ligand field theory.
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Fumio Nishimura, Sadamu Tahira, Nobuo Oda
1973 Volume 35 Issue 3 Pages
861-865
Published: September 05, 1973
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The angular distributions of
M4,5NN Auger electrons ejected from krypton by electron impact have been observed. The energy of primary electrons is 1000 eV. The ejection angle is 10°∼140°. The relative intensities normalized from the counting intensities have been shown to be nearly isotropic for the
M5N2,3N2,3(
1S0) and
M4N1N2,3(
1P1) Auger electrons. The ratios of intensities of seven Auger peaks to that of
M4N1N2,3(
1P1) Auger peak have been also shown to be isotropic within an experimental accuracy.
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Kunitsugu Soda
1973 Volume 35 Issue 3 Pages
866-870
Published: September 05, 1973
Released on J-STAGE: June 01, 2007
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Starting from a discrete bead model and transforming it into a continuous model, a Lagrangian of a stiff chain of variable length is obtained, where not only the bending but also the stretching freedom is taken into account. By applying the Hamilton’s principle to it, a nonlinear equation of motion and free-end boundary conditions that determine the motion of stiff chains in solution are obtained. The physical implication of it is examined and its correctness is clarified. The cause of defects in the conventional equation used by other authors is discussed in comparison with the present equation.
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Mikihiko Hirono
1973 Volume 35 Issue 3 Pages
871-875
Published: September 05, 1973
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The expressions for the line width due to dipole-hexadecapole and quadrupole-hexadecapole interactions was derived following the Tsao and Curnutte’s approach. This theory was applied to CO–SF
6 and NH
3–SF
6 broadening. The plausible value for the hexadecapole moment of SF
6 was estimated to be 30×10
−42 esu by comparing the calculated line widths with the experimental data.
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Suresh Chandra, Jai Prakash
1973 Volume 35 Issue 3 Pages
876-880
Published: September 05, 1973
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A convenient method is suggested for determining the dielectric relaxation parameters of a dilute solution consisting of a polar solute in a non polar solvent. Only the measurements of the static dielectric constant, the complex dielectric constant at one microwave frequency, and the optical dielectric constant are needed to evaluate the relaxation time and distribution parameter.
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Jun Yamada, Takayoshi Okuda
1973 Volume 35 Issue 3 Pages
881-884
Published: September 05, 1973
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For the purpose of producing cesium plasma, cesium vapor was irradiated by the resonance radiation from the outside. By the resonance radiation, the Cs atoms are excited to the doublet resonance levels, 6
P1⁄2 and 6
P3⁄2 and then are ionized through the collision process. Under these conditions, a quiescent current-free plasma with a moderate density of the order of 10
12 cm
−3 was obtained. It was confirmed that the dissociative recombination is a dominant process of the plasma decay and the molecular ion is dominant species. The radial distributions of the electron density have a minimum at the center of the tube.
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Tsutomu Kuroda, Gen’ichi Horikoshi, Taro Dodo, Yasushi Nishida
1973 Volume 35 Issue 3 Pages
885-891
Published: September 05, 1973
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A measurement of low frequency self-oscillating instability in a highly ionized magneto-plasma column is reported. Radial distribution of amplitude and phase velocity of the oscillation is observed by correlation technique. Radial profile of the plasma particle density consists of two regions each of which has a different radial scale length,
n⁄(∂
n⁄∂
r), and it is indicated that in each region, the oscillations with different frequency are localized. The oscillations have similar properties except for the difference in the frequency. All the properties of these oscillation can be described by the theory of resistive drift instability. A rational for the identifications of the oscillations is given.
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O. Demokan
1973 Volume 35 Issue 3 Pages
892-896
Published: September 05, 1973
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In this work, the theory of the excitation of one-half and one-third subharmonic of an external signal in a bounded plasma is presented. The discussion to the Tonks-Dattner resonances is particularized. The power and the frequency of the subharmonics as a function of incident power are derived.
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James W. VanDam, Tosiya Taniuti
1973 Volume 35 Issue 3 Pages
897-906
Published: September 05, 1973
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The Korteweg-de Vries equation for the ion acoustic wave, modifield to include the effects of ion and electron linear Landau damping, is rigorously derived from the Vlasov-Poisson equations by a multi-scale asymptotic expansion method. Careful examination of the various orderings also shows that non-linear resonance effects (trapping, reflection) can be significant.
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Yukiharu Ohsawa, Tosiya Taniuti
1973 Volume 35 Issue 3 Pages
907-909
Published: September 05, 1973
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Existence of envelope shock waves, which can be excited in interactions of waves of random phase, is predicted theoretically. For illustration, the three-wave interaction among two transverse waves and the Langmuir wave propagating in a cold plasma is considered. The group velocity dispersion is found to be crucial. Also conspicuous properties which are remarkably different from those of the usual collisionless shock waves are emphasized.
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Choji Nakaya, Eiji Hasegawa
1973 Volume 35 Issue 3 Pages
910-914
Published: September 05, 1973
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A possibility of equilibrium between secondary vortices of small but finite intensity in circular Couette flow is studied. Equations which describe the time development of the amplitudes of three different toroidal vortices are derived on a vector eigenfunction expansion procedure, nonlinear terms higher than the third order smallness being truncated. The equations determine the intensities of the vortices, if they exist at the same time, which are assumed to be of the same order. Analysis is limited to the case where the inner cylinder is rotating and the outer one at rest, and the gap between the cylinders is small compared with their radii. The calculation seems to suggest that the equilibrium vortex motion is rather periodic if we confine ourselves to these assumptions.
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Masakazu Tatsuno
1973 Volume 35 Issue 3 Pages
915-920
Published: September 05, 1973
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The secondary flow generated by an oscillating circular cylinder immersed in a viscous, incompressible fluid is investigated experimentally. When the modified Reynolds number
r0\sqrtω⁄ν is smaller than about 4, the whole flow field is occupied by only one circulatory streaming (the inner circulation), the direction of which is toward the cylinder along the axis of oscillation and away from the cylinder perpendicular to the axis, where
r0 is the radius of circular cylinder, ω the angular frequency and ν the kinematic viscosity. The distance between the core of the inner circulation and the axis of the cylinder is independent of the outer boundary and the oscillation amplitude. At a critical value of the oscillation amplitude the inner circulation shrinks down sharply. The critical amplitude depends on
r0\sqrtω⁄ν, but it is independent of the outer boundary.
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Takao Muramoto
1973 Volume 35 Issue 3 Pages
921-931
Published: September 05, 1973
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EPR in \bar
E(
2E) of Cr
3+ in Al
2O
3 for
H⊥
c3 (θ=90°) is investigated by an optical detection and |
g⊥| is precisely determined to be 0.0515±0.0001, which agrees fairly well with the calculated value of 0.061. The signal intensity as well as the line width varies in complicated manners depending on θ near 90°. Mechanisms of the optical detection are discussed and it is shown that the observed signals at θ=90° can be attributed to the spins whose
c3-axes are misaligned by random strains. The θ dependence of EPR signals is also explained by assuming the presence of misaligned spins. A pair of dips was observed in the EPR line and is interpreted as the results of the cross relaxation due to one spin flip in \bar
E(
2E) accompanied by the flip of two spins in
4A2.
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Yoshihiro Ishibashi, Yutaka Takagi
1973 Volume 35 Issue 3 Pages
932-935
Published: September 05, 1973
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By the use of the transfer matrix, some formal solutions are shown for the process of crystal growth governed by the first order rate equations. The growth assisted by the kink motion has been studied, and the growth rate is easily expressible in terms of the probabilities with which molecules join or leave a crystal.
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Eiko Takekoshi, Yoshihiro Tsukihashi
1973 Volume 35 Issue 3 Pages
936
Published: September 05, 1973
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Yasuhiro Homma, Sachiko Konishi, Fumio Ochiai, Hisataka Okabe, Masahik ...
1973 Volume 35 Issue 3 Pages
937
Published: September 05, 1973
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