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Keizo Murata, Hiroyuki Anzai, Gunzi Saito, Koji Kajimura, Takehiko Ish ...
1981 Volume 50 Issue 11 Pages
3529-3530
Published: November 15, 1981
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Superconductivity along the least conductive (in the normal state)
c*-axis of the di-(tetramethyltetraselenafulvalene)-perchlorate [(TMTSF)
2ClO
4] was observed by conductivity measurement, showing evidently three dimensional ordering of superconductivity although the coupling was weak in the
c*-direction. Contrary to the appearance of finite resistance below the superconducting transition along the most conductive
a-axis, the finite resistance was not detected in the
c*-axis.
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Takao Goto, Takao Kawai
1981 Volume 50 Issue 11 Pages
3531-3532
Published: November 15, 1981
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The nuclear spin-lattice relaxation time
T1 of
133Cs in one-dimensional Ising-like antiferromagnet CsCoCl
3·2H
2O was measured in the paramagnetic state where short-range orders are well developed. Most of experimental features were interpreted in terms of the diminution of the longitudinal spin correlation due to the random passings of domain boundaries, which is described by an approximate equation
T1−1∼exp (|
J|⁄
kT).
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Hiroshi Fujiwara, Motoyuki Nomura, Hideoki Kadomatsu, Nobuyuki Nakagir ...
1981 Volume 50 Issue 11 Pages
3533-3534
Published: November 15, 1981
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Lattice compressions along the
a- and
c-axes of compounds Fe
2P and Ni
2P were measured at room temperature by means of X-ray diffraction under hydrostatic pressures up to 100 kbar. Compressions were linear with pressure, and the
a-axis was more compressive than the
c-axis in Fe
2P, while the situation was reverse in Ni
2P.
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Kazuo Gesi
1981 Volume 50 Issue 11 Pages
3535-3536
Published: November 15, 1981
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Single crystals of cesium tetraiodozincate, Cs
2ZnI
4, were prepared, and the dielectric constants along the three crystallographic axes were measured below room temperature. As temperature decreases, the dielectric constant along the
b-axis first increases, shows a change in the temperature derivative at 110 K, a λ-type peak at 102 K, and a discontinuous decrease around 90 K. These anomalies correspond to phase transitions.
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Yoshiro Suzuki, Hirofumi Ohtani, Shoji Takagi, Masamitsu Hirai
1981 Volume 50 Issue 11 Pages
3537-3538
Published: November 15, 1981
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Time resolved absorption spectra under the two photon excitation by the second harmonics from a mode locked ruby laser (∼40 ps) have been measured in KI. Instantaneous growth of the tail of the
Vk band within the pulse duration was observed with almost equal efficiency at LHeT and RT. The
Vk band turned into the
Trip. band of the
STE within about 500ps at LHeT, while into the
F band within a few decades of ps at RT. These results suggest the
Vk center as the primary product, and no activation energy barrier for the holes to self-trap. The results are discussed by Toyozawa’s model qualitatively.
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Toshinari Ichihashi, Manabu Kato, Nobuhiko Wada
1981 Volume 50 Issue 11 Pages
3539-3540
Published: November 15, 1981
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The quenched high pressure phase of MnF
2 (MnF
2-IV, Orthorhombic, α-PbO
2 type) were found by X-ray diffraction method in the fine particles prepared by the gas-evaporation in He and Ar. A proportion of such particles to the normal ones with the rutile structure (MnF
2-I) increased with increasing pressure of environment gas (3∼500 Torr).
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Yoh Itoh, Nobuo Kobayashi, Yozaburo Kaneko
1981 Volume 50 Issue 11 Pages
3541-3542
Published: November 15, 1981
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Direct fine-structure transitions, j=3⁄2→1⁄2 and j=1⁄2→3⁄2, were first observed with an ion energy-loss spectrometer at near 0°. The ions were produced with an electron-impact ion source. The peak heights corresponding to both transitions were almost the same over the energy range studied. The ratio of the 3/2 to 1/2 states in the primary ions was determined to be in statistical ratio, 2 : 1, assuming detailed balance for the transitions. Partial excitation cross-sections for the forward scattering within the angle ±0.45° were evaluated from the spectra obtained.
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Hisako Urabe, Yasunori Tominaga
1981 Volume 50 Issue 11 Pages
3543-3544
Published: November 15, 1981
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The low frequency collective modes of DNA in aqueous solution have been observed by Raman spectroscopy. The broad response at ∼85 cm
−1 disappears when DNA is thermally denatured. This fact indicates the existence of characteristic motion of the DNA double helix.
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Kiyoshi Ueda, Hideki Iimura, Masayoshi Karasawa, Kuniya Fukuda
1981 Volume 50 Issue 11 Pages
3545-3546
Published: November 15, 1981
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The hook method has been applied to the 4
s4
p 3P0-4
p2 3P1, 4
s4
p 3P1-4
p2 3P0 and 4
s4
p 3P2-4
p2 3P1 transitions at 2079 A, 2097 A and 2104 A as well as to the visible multiplet 4
s4
p 3P0,1,2-4
s4
s 3S1 at 4680 A, 4722 A and 4811 A. Relative oscillator strengths are determined to be
f2079⁄
f4680*=4.4±1.1,
f2097⁄
f4722*=1.5±0.4 and
f2104⁄
f4811*=1.3±0.4. Uisng known
f* values of the visible multiplet the
gf values are obtained to be
gf2079=0.63,
gf2097=0.63 and
gf2104=0.90.
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Toshiatsu Oda, Ken Kawasaki, Tadashi Ogo, Yoshihumi Ito
1981 Volume 50 Issue 11 Pages
3547-3548
Published: November 15, 1981
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Doppler profiles of the He II line from a small theta pinch plasma are measured to obtain ion temperature, and the fluctuating fields in the plasma are also measured under the same experimental condition. Fast heating and thermarization are observed when strong turbulence induced at early stage of the implosion phase is rapidly decaying.
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Hajime Takayama, Koh Wada
1981 Volume 50 Issue 11 Pages
3549-3554
Published: November 15, 1981
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Quantum-statistical phonon free energy of the one-dimensional since-Gordon system is calculated perturbationally with respect to the coupling constant. Its classical limit agrees completely with the phonon terms with anharmonic effects obtained by the transfer integral method. The free energy associated with the
n=2 breather is shown to be a part of such anharmonic phonon terms.
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Hajime Takayama, Sei-ichi Takase
1981 Volume 50 Issue 11 Pages
3555-3561
Published: November 15, 1981
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For the purpose to study clustering feature in one sample of spin glasses by means of Monte-Carlo simulations, we devise a ‘bond pattern’ of the system, which is constructed by drawing stable right bonds (〈σ
iσ
j sgn (
Jij)〉≅1) and stable wrong bonds (〈σ
iσ
j sgn (
Jij)〉≅−1) in a figure. We apply this idea to a Gaussian Ising spin glass, and investigate temperature- and time-dependences of clusters in this system, which are sets of spins connected by such stable bonds.
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Hidetoshi Fukuyama
1981 Volume 50 Issue 11 Pages
3562-3568
Published: November 15, 1981
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It is shown that the intervalley impurity scattering affects the interaction dependent prefactor of logarithmic temperature dependence of the quantum correction to the conductivity. The result is compared with experiments on Si–MOS.
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Yoshihiro Yamada, Kyozo Ôhira
1981 Volume 50 Issue 11 Pages
3569-3574
Published: November 15, 1981
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NMR spin echo technique was used to study magnetic properties of the Laves phase compound Zr(Fe
1−xMn
x)
2. For the C-15 type ferromagnetic compound (
x≤0.3),
55Mn spectra showed well-resolved and regular satellites between 100 and 230 MHz at 15 K in zero external field. This suggests that Mn atoms have small magnetic moments which hardly change with
x for
x≤0.3. For the C-14 type compounds (
x≥0.4), the experiment suggests that antiferromagnetism appears with the crystal structure transformation and disappears gradually with increasing
x. The spin structure of the antiferromagnetic compound is discussed. The fine structure attributable to electric quadrupole interaction was observed in the
55Mn spectrum of ZrMn
2. The value of
e2qQ⁄
h derived from the structure is 7.3 MHz.
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Hideya Onodera, Hisao Yamamoto
1981 Volume 50 Issue 11 Pages
3575-3582
Published: November 15, 1981
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Amorphous alloys having the composition (Fe
1−xMn
x)
80B
20 (0≤
x≤0.25) have been studied by Mössbauer spectroscopy and magnetization measurements. All the samples show ferromagnetic behaviors. The saturation magnetization at 0 K, the Curie temperature
TC and the average hyperfine field decrease monotonically from 197 emu/g, 680 K and 286 kOe in
x=0 to 107 emu/g, 383 K and 178 kOe in
x=0.25. The concentration dependence of
TC gives a conclusion for the exchange interaction that
JFe–Mn and
JMn–Mn are relatively small positive and negative values, respectively, compared with
JFe–Fe. The magnetic moments of the Fe and Mn atoms are discussed in connection with the exchange interaction.
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Shigeru Takatori, Naoshi Suzuki, Kazuko Motizuki
1981 Volume 50 Issue 11 Pages
3583-3587
Published: November 15, 1981
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We have studied the system with alternating strong and weak exchange coupling of constants
J1 and
J2 and found how the magnetic properties depend on the ratio
J2⁄
J1. The results obtained for smaller
J2⁄
J1 by calculation on the basis of the model of pair and lone spins much differ from those obtained by the simple molecular field approximation.
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Mitsuhiro Motokawa, Naoshi Suzuki, Kazuko Motizuki
1981 Volume 50 Issue 11 Pages
3588-3589
Published: November 15, 1981
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The magnetization of the single crystal RbMnCl
3 has been measured at 4.2 K under the high magnetic fields and the results have been analyzed on the basis of the theory developed in the preceding paper I.
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Kazuo Sakai, Chikara Ishii, Hidetoshi Fukuyama
1981 Volume 50 Issue 11 Pages
3590-3602
Published: November 15, 1981
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Effects of impurities on the diamagnetic susceptibility of bismuth are examined on the basis of two-band model of Wolff. The impurity potential is assumed to be of short range but its strength can be arbitrary. The single impurity problem is first considered and it is shown that an impurity level emerges from the upper conduction (lower valence) band and lies above (below) the center of the band gap, when the strength of the potential exceeds a critical value. Assuming a small concentration of impurities, the modification of single electron density of states is calculated, and used in the evaluation of the correction to the diamagnetic susceptibility. It is shown that the contribution from the bound levels is paramagnetic or diamagnetic, according as the level is emerged from the conduction or valence band, reflecting the specific interband effects associated with the strong spin-orbit interaction. The effective
g-factor of the electron spin in the impurity level is also derived.
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Kazuyoshi Takeda, Masaru Wada
1981 Volume 50 Issue 11 Pages
3603-3611
Published: November 15, 1981
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The first experimental study of the statistics of a quasi-one-dimensional Ising system under the magnetic field
Hα, described by the Hamiltonian
(
Remark: Graphics omitted.)
has been performed, where
J1 and
J2 are the intra- and the inter-chain exchange constants, respectively. A single crystal of the compound (CH
3)
3NHCoCl
3·2H
2O has been used as a model sample of the ferromagnetic system with
J1⁄
kB=14.2 K and
J2⁄
kB=0.20 K. It has been revealed that the experimental values of the magnetic heat capacity under the field
Hα>2
J2⁄
gzμ
B (≈0.8 kOe) applied along the spin preferential axis are excellently reproduced by the values calculated for the isolated Ising chain under the longitudinal field (α=
z;
gz=6.54). For the temperature higher than 7 K (≈
J1⁄2
kB), the experimental values of the magnetic heat capacity under the field along the spin hard axis have also agreed with the theoretical values for the isolated Ising chain under the transverse field (α=
y;
gy=3.90).
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Satoshi Iida, Shuzo Kawarazaki, Nobuhiko Kunitomi
1981 Volume 50 Issue 11 Pages
3612-3619
Published: November 15, 1981
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The magnetic properties of CrGe alloys have been investigated by neutron diffraction measurements. An addition of Ge to Cr increases the Néel temperature, the magnetic moment and the wave vector of the spin density wave (SDW). The commensurate SDW phase appears in the alloys containing Ge impurities more than 1 at.%. The observed features are discussed on the basis of the two band nesting model supposing that the Ge atom in Cr acts as electron donor and also on the model in which the Ge atom in Cr acts as the magnetic vacancy.
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Yoshiro Kakehashi
1981 Volume 50 Issue 11 Pages
3620-3628
Published: November 15, 1981
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Various magnetic properties of Fe and Ni are studied on the basis of the previously developed theory which takes account of the nonlocal spin fluctuation due to neighboring pair interactions. Calculated reductions of
Tc are 14% for Fe and 2% for Ni, the SRO at
Tc are 0.17 for Fe and 0.13 for Ni. The SRO causes the peak of the specific heat
Cv at
Tc higher than that in the single site theory, the slight decrease of
Cv in the paramagnetic state near
Tc with increasing temperatures and an downward convexity of the inverse susceptibility of Ni near
Tc. It is also found that the effect of the SRO on the amplitude of the local moment, which never exist in the simple Ising model, causes the negative electronic contribution to the thermal expansion coefficient of Fe above
Tc.
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Hiroshi Hatanaka, Tsuneo Hashi
1981 Volume 50 Issue 11 Pages
3629-3636
Published: November 15, 1981
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Effects of magnetic dipolar interaction between like nuclei on two-quantum (TQ) free decay were examined in a multi-level NMR system, Al in Al
2O
3. TQ free decay was observed using a TQ π⁄2-pulse followed by a probe pulse. The effect of probe pulse was carefully examined to deduce the intrinsic decay time of the TQ coherence. The second moments for two- and three-quantum transitions were calculated. The observed decay time is in good agreement with that obtained from the calculated second moment by assuming Gaussian decay. Basic equations for TQ resonance are also presented.
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Yutaka Nakai, Satoshi Iida
1981 Volume 50 Issue 11 Pages
3637-3643
Published: November 15, 1981
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Both the amplitude of the magnetic moment
M1 and the wave vector δ on the primary component of antiferromagnetic spin density wave in Cr(V) and Cr(Mn) alloys were measured by means of neutron diffraction. A linear relation of
M12 to δ
2 is found at each temperature. The observation leads to the expression for the magnetic moment density on the sublattice by a Jacobi’s elliptic sn function whose modulus varies with the composition. The sn function expression was found to be useful for the representation of the harmonics of the SDW, too.
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Fujio Kakinuma, Satoru Ohno
1981 Volume 50 Issue 11 Pages
3644-3649
Published: November 15, 1981
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The electrical resistivities and the magnetic susceptibilities of liquid indium alloys containing rare-earth solutes have been measured from the melting point to about 1000°C. In the case of light rare-earth solutes, the additional resistivities increase from La to Nd solute with increasing the number of 4f electrons. The additional susceptibilities obey a modified Curie law. The temperature-independent susceptibilities are fairly large. Then, the effective magneton numbers are smaller than the values expected by the Van Vleck theory. These experimental results indicate that the 4f electrons of light rare-earth solutes interact with conduction electrons. The systematic variation of the additional resistivity for light rare-earth solutes might be attributed to the s–f or d–f mixing.
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Kouichi Ichikawa, Naoki Suzuki, Kenjiro Tsutsumi
1981 Volume 50 Issue 11 Pages
3650-3654
Published: November 15, 1981
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The X-ray photoelectron spectrum and the Li
K photoelectric yield spectrum of LiH have been measured to study the electronic structure of the valence band and the conduction band. The structure of the spectra is compared with the existing energy-band calculations of LiH. The calculated energy band including the correlation-relaxation effects explains qualitatively the observed shapes of the spectra. However, in detail there exist several discrepancies between the experimental and the calculated results with respect to the band width and the energy differences among the core level, the valence band and the conduction band.
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Seiichiro Ikehata, Taiji Ema, Shun-ichi Kobayashi, Wataru Sasaki
1981 Volume 50 Issue 11 Pages
3655-3660
Published: November 15, 1981
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Magnetization in phosphorus doped silicon was measured with magnetic fields up to 95 kG and temperatures down to 1.5 K. The donor concentration of measured samples ranged from 0.53 to 6.5 times 10
18 cm
−3. The most heavily doped sample shows diamagnetic susceptibility which is consistent with a simplified picture of degenerate semiconductor. Other samples, including two metallic ones, show a temperature dependence of magnetization which can be attributed to free spins, and the number densities of free spins estimated from the magnetization curve are shown consistent with those estimated from the specific heat anomaly. The origin of these free spins is discussed with taking into account the intrastate Coulomb energy of localized states.
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Takeo Okamoto, Shigeru Minomura
1981 Volume 50 Issue 11 Pages
3661-3663
Published: November 15, 1981
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The pressure dependences of the electrical resistance and the thermal activation energy of NbO
2 were measured up to 150 kbar and 1200 K by using a Drickamer anvil and a wedge type cubic anvil high pressure apparatuses. The pressure-induced phase transition was observed at 85 kbar at room temperature. The high pressure phase was found to be a narrow gap semiconductor. Experimental results suggest that the weak Nb–Nb pair bond still exists in the high pressure phase.
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Tohru Suemoto, Hiroshi Kanzaki
1981 Volume 50 Issue 11 Pages
3664-3668
Published: November 15, 1981
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Higher excited states (2p
53p) of the atomic-type self-trapped excitons (STE) are produced by a pulsed electron beam irradiation and a subsequent laser pulse excitation in solid and liquid neon. The decay processes from these states are investigated by absorption and luminescence spectra. Luminescence corresponding to 3p→3s transitions in Ne atom and conversion of the atomic-type STE to molecular-type STE are observed. The bubble formation around the molecular-type STE is concluded from the time evolution of absorption spectra after pulsed electron irradiation.
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Isao Minagawa
1981 Volume 50 Issue 11 Pages
3669-3676
Published: November 15, 1981
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The static dielectric constant of ice Ih is calculated, considering the energy differences between the configurations of hydrogen atoms obeying the Bernal-Fowler rule, by Takagi’s method of KDP crystals in the framework of Kirkwood-Fröhlich theory. This is the study of the phase transiton with thirteen order parameters. A model of water molecule, called the tetrapod model, is proposed, which is a four-point-charge model plus an additional quadrupole moment. Considering the multipole interaction, the Curie-Weiss law is derived. With the change of the quadrupole moment, ferroelectric or antiferroelectric phase transition occurs. With suitable quadrupole moment, the experimental Curie-Weiss constant 46 K parallel to the
c-axis and the observed anisotropy of the dielectric constants can both be derived, where the transition temperature to ferroelectric phase is 69 K.
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Shozo Sawada, Toshihisa Yamaguchi, Yoshihiro Shiroishi, Akitoshi Yamam ...
1981 Volume 50 Issue 11 Pages
3677-3680
Published: November 15, 1981
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The phase transition points of ferroelectric Rb
2ZnBr
4 were re-examined by the DTA technique. The ferroelectric Curie temperature
TC on heating was determined as −81°C. The incommensurate-normal transition point
T1 is 74°C. The dielectric constants in the
a,
b and
c directions were measured in a temperature range of −150∼120°C covering
TC and
Ti. The Curie-Weiss law was found to hold in the ferroelectric
a direction above
TC. The temperature- and applied field-dependence of the 60 Hz
D-
E hysteresis loop were studied in detail. The triple loop observed just below
TC and the anomalous field dependence of the spontaneous polarization show the ferroelectricity in Rb
2ZnBr
4 would be ferrielectricity in reality.
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Seishi Kudo, Takuro Ikeda
1981 Volume 50 Issue 11 Pages
3681-3687
Published: November 15, 1981
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Temperature dependence of birefringences and lattice strains in K
2SeO
4 has been investigated. They exhibit anomalies at the upper transition temperature (129.5 K), whereas no anomalies are found at the Curie temperature (93 K). Experimental results are analyzed by a phenomenological theory based on the incommensurate order parameter. Spontaneous birefringences are ascribed to the coupling with the order parameter and to the photoelastic effect through the spontaneous lattice strains.
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Kazushige Mori
1981 Volume 50 Issue 11 Pages
3688-3694
Published: November 15, 1981
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On the basis of the effective Hamiltonian method the static properties of the transverse Ising model with substitutional disorder have been investigated. By a perturbation expansion of the density matrix the self-consistent equation for the effective field is obtained in an analytical form. The transition temperature and the susceptibility etc. are derived from the partition function and numerically calculated. It is shown that for the diluted systems this approximation gives much lower transition temperatures and higher critical concentrations than the simple ones previously derived. In the two-component system with a strong transverse field a finite critical concentration is predicted in contrast to the previous studies. The application of this approximation to the “pseudo” one-dimensional systems having weak interchain correlations is also discussed.
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Ryumyo Onaka, Takanori Kawamura
1981 Volume 50 Issue 11 Pages
3695-3700
Published: November 15, 1981
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The refractive indices of KDP for ordinary and extraordinary rays are studied as a function of temperature for mercury lines down to 253.7 nm. A marked hysteresis is observed for the crystal cooled down below
Tc. The temperature coefficient of the refractive indices in the paraelectric phase has little dependence on the wavelength. From the data obtained the refractive indices and their temperature dependence are discussed from the point of view of the electronic structure.
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Akiyoshi Hatayama, Yuji Koshi, Masatada Ogasawara
1981 Volume 50 Issue 11 Pages
3701-3708
Published: November 15, 1981
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A set of model equations of the dissipative trapped ion instability is derived and solved numerically. Multiple time scale expansion scheme is applied to the non-linear fluid equations of Kadomtsev and Pogutse by taking μ=ω⁄ν
e as a small parameter, where ω is the frequency of the wave and ν
e is the effective collision frequency of the electrons. All the modes except for the linearly most unstable one die away due to the mode coupling. Final saturation of the mode is attributed to the modification of background trapped ion number density averaged over the poloidal direction. The coefficient of trapped ion anomalous diffusion, which scales as
D∝ν
ia2 (ν
i is the effective collision frequency of the ions and
a is the minor radius of a torus) is also derived.
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Hidehiko Sugimoto, Yuh Fukai
1981 Volume 50 Issue 11 Pages
3709-3717
Published: November 15, 1981
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The energy and wave functions of the ground and excited states have been calculated for hydrogen isotopes (H and D) self-trapped on the tetrahedral (T) site in bcc metals V, Nb and Ta. Results of the calculation account well for all features of localized vibration spectra observed by inelastic neutron scattering, including the excitation energy and the relative intensity of peaks. In addition, it has been shown that the excitation energy varies sensitively with displacements of surrounding metal atoms, leading to the interpretation that the observed broadening of the peaks is caused by lattice deformation arising from lattice vibration and the presence of other H (D)-atoms.
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Toshihide Takagahara
1981 Volume 50 Issue 11 Pages
3718-3724
Published: November 15, 1981
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Nonlinear optical methods to determine the transverse relaxation constants of excitonic molecules making use of two-photon echo and a new type of excited state photon echo are proposed. The two-photon echo is a seventh order nonlinear effect at the lowest and one needs three pulses to observe it, while the excited state photon echo is a fifth order nonlinear effect and requires four pulses. In these nonlinear optical methods we can satisfy the phase matching condition rather easily due to the large dispersion of excitonic polaritons. We can determine directly the transverse relaxation constants associated with the excitonic molecule from the correlation trace of the two-photon echo and the excited state photon echo.
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Kiyoshi Aoyagi, Masako Kajiura, Satoru Sugano
1981 Volume 50 Issue 11 Pages
3725-3733
Published: November 15, 1981
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The absorption spectrum of a Cr
3+ ion in an antiferromagnetic disprosium aluminum garnet with the Néel temperature
TN of 2.5 K, is measured in the red region between 1.7 K and 4.2 K. It is shown that the fine structure of the
R1 and
R2 lines at 1.7 K can be explained by using an effective Hamiltonian for the
t2g3 2E excited state of Cr
3+ in the surrounding of the ordered Dy
3+ spins. The gross feature of the observed temperature dependence of the fine structure is shown to be reproduced by assuming appropriate exchange interactions of Cr
3+ with Dy
3+.
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Mikihiko Ikezawa, Mareo Ishigame
1981 Volume 50 Issue 11 Pages
3734-3738
Published: November 15, 1981
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The absorption spectrum caused by the two-phonon difference process in Si has been found in the wavenumber region from 80 to 400 cm
−1. The absorption coefficient is below 0.5 cm
−1 at room temperature. Peaks of the spectrum, which have been observed at 265, 313 and 381 cm
−1, are attributed to the phonons at L and X points in the Brillouin zone. Owing to the high symmetry of the dispersion relation of the phonons at these points, the peaks are found in pairs with those of the two-phonon summation process of the same phonons. Peaks observed at 120 and 152 cm
−1 are due to accidental singularities which occur only in the difference energy surface of two phonons.
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Hidenori Akiyama, Osamu Matsumoto, Susumu Takeda
1981 Volume 50 Issue 11 Pages
3739-3743
Published: November 15, 1981
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The effect of the ponderomotive force on a plasma with flow is studied by controlling the velocity. The density of the plasma with flow velocity slower/faster than the ion acoustic velocity respectively decreases/increases by the ponderomotive force of the high frequency field. The density change is proportional to the square of the high frequency electric field intensity. The experimental results are compared with the theoretical ones calculated from the continuity and momentum equations, including a term of the ponderomotive force.
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Takashi Abe, Keishiro Niu
1981 Volume 50 Issue 11 Pages
3744-3750
Published: November 15, 1981
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The plasma with stress tensor is shown to be unstable for the ion acoustic mode in addition to the electromagnetic mode. These unstable modes are saturated by nonlinear effects, and constitute steady turbulent state. The fluctuations in thus derived turbulence take a role of effective collisions for ion and electron in a plasma, and cause the anomalous viscosity. In the imploding target plasma of ICF, this anomalous mechanism becomes important at electron temperature above 10 keV, and reduces the viscosity to about 10
−2 times of the classical one at
Te=100 keV.
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Hiroki Yoshihara, Tsutomu Iwayanagi, Tosiya Taniuti
1981 Volume 50 Issue 11 Pages
3751-3758
Published: November 15, 1981
Released on J-STAGE: June 01, 2007
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The present paper deals with the nonlinear theory of the collisional drift-wave instability near the neutral stable point. It is shown that under the periodic boundary condition in the direction of the applied magnetic field, the collisional drift-wave growing linearly excites the convective-mode, that is the disturbance normal to the magnetic field, and by means of the coherent nonlinear interaction with the convective-mode, the growth is saturated at a peak level, then the drift-wave begins to decay, and ultimately damps out. The saturation level is proportional to the linear growth rate [∝(
B−
Bc)⁄
Bc] in contrast to the usual one proportional to the square root of the linear growth rate such as being given by the quasi-linear theory.
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Hiroharu Fujita, Shinya Yagura, Eiichi Yamada
1981 Volume 50 Issue 11 Pages
3759-3761
Published: November 15, 1981
Released on J-STAGE: June 01, 2007
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An influence of a heating voltage on potential measurements by an emissive probe immersed in a plasma is studied. It is found that a peak point of the first-derivative curve of the current-voltage characteristic shifts even during the off cycle of the heating voltage with a half-wave rectified sinusoidal form. Calculations predict that this comes from a joule heating effect.
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Boye Ahlborn
1981 Volume 50 Issue 11 Pages
3762-3768
Published: November 15, 1981
Released on J-STAGE: June 01, 2007
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A one dimensional analytical model for simple laser shell targets with self regulated inverse bremsstrahlung absorption and tamped flow is presented for comparison with a similar model derived previously for targets with unrestricted flow. The ablation pressure for tamped flow is about an order of magnitude higher than for free flow. It does not depend on the ablation temperature and the laser wavelength and it can be influenced by the ablator density. The shock wave velocity is higher but the exhaust velocity, the exhaust Mach number, the burn velocity and the mass ablation rate are lower for the retarded flow.
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Hiroshi Iyetomi, Kenichi Utsumi, Setsuo Ichimaru
1981 Volume 50 Issue 11 Pages
3769-3777
Published: November 15, 1981
Released on J-STAGE: June 01, 2007
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Corrections to the thermodynamic functions of high-density hydrogen plasmas arising from the screening effects of the degenerate electron liquid are investigated through the variational method based on the Gibbs-Bogoliubov inequality. The Monte Carlo solution to the one-component plasma (OCP) systems is adopted as the reference; the screening effect is taken into account through the improved dielectric function proposed recently by Utsumi and Ichimaru. Results are compared with those obtained by Galam and Hansen on the basis of different screening functions. Relative accuracy and validity of the OCP variational methods are examined on the scales of correlation functions; it is thereby noted that the exchange and Coulombic local-field corrections between electrons introduce significant modifications to the microscopic description of high density plasmas.
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Hiroshi Iyetomi, Kenichi Utsumi, Setsuo Ichimaru
1981 Volume 50 Issue 11 Pages
3778-3781
Published: November 15, 1981
Released on J-STAGE: June 01, 2007
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The electric resistivity of high-density hydrogen plasma is calculated according to Ziman’s formula with the aid of the improved variational structure factor. Numerical results obtained in various approximation schemes are compared and discussed.
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Akira Sakurai, Tsutomu Arai
1981 Volume 50 Issue 11 Pages
3782-3784
Published: November 15, 1981
Released on J-STAGE: June 01, 2007
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Some modifications of previous results of an accuracy estimate for the
M2-expansion solution to a two-dimensional, steady flow past a circular cylinder without circulation are made to result in the existence proof of a solution of Imai’s equation for the flow. This is extended to a flow past a cylinder of a more general profile with a circulation around it. Regularity of the solution is also considered.
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Ryogo Hirota
1981 Volume 50 Issue 11 Pages
3785-3791
Published: November 15, 1981
Released on J-STAGE: June 01, 2007
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A discrete analogue of a generalized Toda equation and its Bäcklund transformations are obtained. The equation is expressed with the bilinear form as follows
[
Z1 exp (
D1)+
Z2 exp (
D2)+
Z3 exp (
D3)]
f·
f=0
where
Zi and
Di for
i=1, 2, 3, are an arbitrary parameter and a linear combination of the binary operators
Dt,
Dx,
Dy,
Dn, etc., respectively.
The equation is very generic, namely appropriate combinations of parameters give various types of soliton equations including the Korteweg-de Vries equation, Kadomtsev-Petviashvili equation, modified KdV equation, sine-Gordon equation, nonlinear Klein-Gordon equation, Benjamin-Ono equation and various types of discrete analogues of soliton equations.
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Hiroyuki Nagashima, Masaaki Kuwahara
1981 Volume 50 Issue 11 Pages
3792-3800
Published: November 15, 1981
Released on J-STAGE: May 29, 2007
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Computer simulation of the nonlinear wave equation
ut+
uux−γ
2u5x=0 was carried out. The results show that one solitary wave with oscillatory tails propagates stably and it is described as
u=λ
f{λ
1⁄4(
x−λ
t)}.
It is found that the two-solitary wave interaction is classified into two types, T and B, according to the relative amplitudes of waves, and after type the T interaction, both identities of solitary waves before the interaction are conserved, while after type the B interaction their identities are approximately conserved.
Formation of a two-solitary wave’s bound state is observed after three-solitary wave interaction, and the condition of the bound state formation is discussed.
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Susumu Kurihara
1981 Volume 50 Issue 11 Pages
3801-3805
Published: November 15, 1981
Released on J-STAGE: June 01, 2007
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Traveling wave solutions are examined for the nonlinear wave equation
(
Remark: Graphics omitted.),
which describes the dynamics of condensate wave function ψ(
x,
t) in superfluid film of mean thickness
d. An exact one-soliton solution is obtained analytically for arbitrary amplitude, and this suggests that the “quasi-solitons” found in the previous numerical work are stable at least in the asymptotic situation where quasi-solitons are essentially non-overlapping. It is shown explicitly that our solution reduces, in small amplitude regime, to the Korteweg-de Vries one-soliton solution.
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Etsuro Date, Michio Jimbo, Masaki Kashiwara, Tetsuji Miwa
1981 Volume 50 Issue 11 Pages
3806-3812
Published: November 15, 1981
Released on J-STAGE: June 01, 2007
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The hierarchy of Kadomtsev-Petvisahvili (KP) equation is studied on the basis of free fermion operators. Particular emphasis is laid on relating the operator approach to the Grassmann formulation of M. and Y. Sato. A new bilinear identity for wave functions is derived, and is shown to generate the series of Hirota bilinear equations for the KP hierarchy. Extension to the multicomponent case is also discussed.
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