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Volume 71, Issue 7
Displaying 1-38 of 38 articles from this issue
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Takashi Teramoto, Yasumasa NishiuraArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1611-1614
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe richness of spatial structures of the diblock copolymer melts is demonstrated by the minimization of a free-energy functional of nonlocal type. The total chain length and the interface thickness are key factors in determining the morphology of the system, in addition to the constant mean curvature surface ansatz. We examine the transition between lamellar and double gyroid phases, in which the rhombohedral phase is also obtained in the weak segregation regime.View full abstractDownload PDF (344K) -
Hyunchul Nha, Jai-Hyung Lee, Young-Tak Chough, Sang-Wook Kim, Kyungwon ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1615-1617
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSWe investigate a coupled atom-cavity system in which a two-level atom is driven by a classical field. It is shown that the cavity mode, which is in a coherent state in the absence of its reservoir, can be squeezed via coupling to the reservoir. The squeezing effect is enhanced to some extent as the cavity damping rate is increased. In particular, we obtain an unusual optimal condition for the squeezing in which the pumping field is inversely proportional to the damping rate.View full abstractDownload PDF (178K) -
Yoshihiro Yamazaki, Akihiko TodaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1618-1621
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSWe experimentally investigated the dynamical behavior of adhesive tape in peeling with emphasis on the emergence of slow and fast peeling motions. The dynamical-morphological phase diagram for peeled adhesive tape as a function of peel speed and spring constant was obtained. The spatiotemporal patterns of peeled adhesive were classified into four types: low-speed pattern, high-speed pattern, oscillatory pattern, and spatiotemporal intermittent pattern.View full abstractDownload PDF (398K) -
Takafumi Makihara, Shigeo Kida, Hideaki MiuraArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1622-1625
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe coherent tubular vortices, which exist ubiquitously in turbulent flows and play central roles in turbulence dynamics, are visualized by the low-pressure vortices. Since many vortices move about randomly in a turbulent flow, it is not easy to track, by the naked eye, a particular vortex. Here we propose an automatic tracking scheme for low-pressure vortices which may be useful in investigating the dynamics and life history of individual vortices.View full abstractDownload PDF (2090K) -
Yutaka Moritomo, Akihiko Machida, Toshihiko Nonobe, Kenji OhoyamaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1626-1629
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSLattice and magnetic properties are investigated for 3% Ru- and Cr-doped Nd1/2Ca1/2MnO3. The parent Nd1/2Ca1/2MnO3 is a charge-ordered insulator (TCO = 250 K). With decreasing temperature below ≈ 210 K, these compounds are separated into two perovskite phases, that is, the long-c and short-c phases. The long-c region shows a ferromagnetic transition at TC ≈ 210 K for the Ru-doped compound and ≈ 130 K for the Cr-doped compound, while the short-c region shows antiferromagnetic transition at TN ≈ 150 K for Ru and ≈ 110 K for Cr. We discuss the origin of the enhanced TC for the Ru-doped compound in terms of the effective one-electron bandwidth W of the eg-band.View full abstractDownload PDF (207K) -
Jiro Kitagawa, Toshiro Takabatake, Eiichi Matsuoka, Fumihisa Takahashi ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1630-1633
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSRare-earth palladium bronzes EuPd3S4 and YbPd3S4 with a crystal structure akin to that of the filled-skutterudite compounds are known to show the heterogeneous mixed-valence state scarcely observed among rare-earth intermetallics. In order to shed light on the state, we have measured the thermopower, electrical resistivity and specific heat. It is found that no enhancement of the density of states near the Fermi level occurs in either compound, unlike the case of homogeneous mixed-valence compounds. The thermopower of both systems is qualitatively interpreted using the two-carrier model of electrons and holes, consistently with the reported data of the Hall effect of EuPd3S4.View full abstractDownload PDF (195K) -
Zenji Hiroi, Jun-Ichi Yamaura, Yuji Muraoka, Masafumi HanawaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1634-1636
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSEvidence of another phase transition at 120 K in the metallic pyrochlore oxide Cd2Re2O7, following a structural transition at 200 K and followed by a superconducting transition at 1.0 K, is obtained by resistivity, magnetoresistance, specific heat, and X-ray diffraction measurements. The results indicate unique successive structural and electronic transitions in the pyrochlore compound, revealing an interesting interplay between the crystal and electronic structures on the itinerant electron system in the pyrochlore lattice.View full abstractDownload PDF (103K) -
Iman N. Askerzade, Ali GencerArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1637-1639
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSTemperature dependence of the thermodynamic magnetic field for the superconducting magnesium diboride, MgB2, is studied in the vicinity of Tc using a two-band Ginzburg-Landau (G-L) theory. The results are shown to be in good agreement with calculations from experimental data. In addition, the two-band G-L theory gives a smaller specific heat jump, than a single-band G-L theory.View full abstractDownload PDF (70K) -
Akito Kobayashi, Atsushi Tsuruta, Tamifusa Matsuura, Yoshihiro KurodaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1640-1643
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSWe investigate the T-δ phase diagram of the electron-doped systems in high-Tc cuprates where δ is doping rate. Taking the ingap state and the superexchange interaction Js, we calculate the superconducting transition temperature Tc, the antiferromagnetic transition temperature TN, and the NMR relaxation rates 1/T1 with the antiferromagnetic fluctuations in the fluctuation-exchange (FLEX) approximation and with the superconducting fluctuations in the self-consistent t-matrix approximation. The obtained phase diagram has features in common with those in the hole-doped systems, including the antiferromagnetic state, the superconducting state and the spin gap phenomenon. Doping dependences of TN, TC and TSG (spin gap temperature) are, however, different from those in the hole-doped systems. These differences are due to the intrinsic nature of the ingap state, which have been shown in the d-p model. The ingap state is intimately related to the Zhang-Rice singlets in the hole-doped systems, while it corresponds to correlated d-electrons in the electron-doped systems.View full abstractDownload PDF (113K) -
Hiroshi ShimaharaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1644-1647
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSAn experimental phase diagram of the field-induced superconductivity in the λ-(BETS)2FeCl4 compound is theoretically reproduced by a combination of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and the Jaccarino-Peter mechanism. Semi-quantitative agreement is obtained in the presence of a very weak subdominant triplet pairing interaction between electrons with antiparallel spins, in addition to a dominant singlet pairing interaction. An order-parameter mixing effect enhances the FFLO state and plays an essential role in the semiquantitative agreement. As a possible origin of the small triplet component, pairing interactions mediated by spin fluctuations are proposed. It is argued that, in this mechanism of the pairing interactions, equal spin pairing interactions are much weaker than the antiparallel spin pairing interactions in the strong magnetic field, which is consistent with the lack of observation of equal spin state.View full abstractDownload PDF (110K) -
XiaoJun Liu, Yutaka Moritomo, Arao Nakamura, Hidekazu Tanaka, Tomoji K ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1648-1650
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe effect of B-site substitution on the critical behavior has been investigated in Cr-doped manganites La0.7Ca0.3Mn1-xCrxO3 (x=0.00, 0.03 and 0.06) by means of the pump-probe method. We have observed that the Cr-doping suppresses the critical behavior of the relaxation time τ. This suppression has been interpreted in terms of a reduced correlation length of the photoinduced charge-ordering fluctuations due to the B-site impurities.View full abstractDownload PDF (199K) -
Kuen Lee, P. M. Hui, Dan Mao, Bing-Hong Wang, Qing-Song WuArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1651-1654
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSWe propose and study new vehicular traffic flow models, incorporating the anticipation of the change in the car spacings ahead in the determination of the speed of the cars in each time step. Our models are based upon the Fukui and Ishibashi (FI) traffic flow model in which cars are allowed to move a maximum of M sites in each time step if spacing permits, together with a probabilistic delay for the cars moving at the maximum speed. By taking into account the anticipation in the change of car spacing due to movement of the car ahead, the present models give an enhanced traffic flux as compared to the FI model. The present models also give a fundamental diagram consisting of three phases - a feature consistent with traffic flow observations.View full abstractDownload PDF (108K) -
Norio InuiArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1655-1662
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSQuantized electromagnetic field inside a rectangular parallelepiped surrounded by perfectly conducting parallel walls is studied. The Casimir energy and the Casimir force at finite temperature are calculated by the mode summation method, and it is found that the sign of the Casimir force depend on both the shape of a cavity and the temperature. The temperature at which the Casimir force change from the attractive force to the repulsive force is shown as a function of the separation of walls. The correction of the Casimir force between perfectly conducting plates for the finite size effect is also considered.View full abstractDownload PDF (249K) -
J. H. Ha, J. C. Kim, C. S. Lee, J. H. Lee, J. Y. Huh, C.-B. Moon, S. J ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1663-1671
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSWe observed four rotational bands in 168Lu using the 159Tb(13C,4nγ)168Lu reaction at 58.5 MeV and 62 MeV and populated high spin states up to 27 \hbar. On the basis of the X-γ gating procedure and excitation function measurements done at beam energies of 50, 55, 58.5, 60, 62 and 64 MeV, we could identify the γ-ray transitions belonging to 168Lu. The configurations of two strongly populated rotational bands (bands A and B) were based on our previous study and were examined by using the additivity relation for alignments. The configurations of two newly found rotational bands (bands C and D) were also assigned by the additivity relation. These identified configurations were confirmed by the Drissi's recipe and energy systematics of neighboring odd-odd nuclei. The configuration of bands A was assigned as Kπ = 6+ [π7/2+[404] + ν5/2+[642]]. The configurations of the previous reported band B and two new bands C and D are likely to be 3-[π1/2-[541]+ν5/2+[642]], 7-[π9/2-[514]+ν5/2+[642]] and 5+[π5/2+[402]+ν5/2+[642]], respectively. We observed band crossing for three bands A, C and D, but not for band B. The extracted band crossing frequencies were consistent with the neutron BC crossing observed in neighboring odd-odd nuclei as well as odd-N and even-Z nuclei in this mass region. This was attributed to the occupied ν5/2+[642] Nilsson configuration arising from the neutron ν i13/2 orbital. Energy systematics of bands built on π g7/2 \otimes ν i13/2 and π h11/2 \otimes ν i13/2 in neighboring odd-odd nuclei were also studied in comparison with bands A and C in 168Lu.View full abstractDownload PDF (280K) -
Neng Wu Zheng, Tao Wang, Tao Zhou, Dong Xia MaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1672-1675
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSUsing the Weakest Bound Electron Potential Model Theory, the problem of many-electron systems is simplified as a single-electron problem. Transition probabilities of oxygen atom and oxygen ions (O II-O VI) are calculated through a simple calculation procedure. Compared with the critical compilation values, present results are accurate, and the agreement is within the uncertainty of the critical compilation values.View full abstractDownload PDF (70K) -
Michi Koide, Fumihiro Koike, Ralf Wehlitz, Ming-Tie Huang, Tetsuo Naga ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1676-1679
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe photoion spectrum of atomic potassium was measured over the 3s → np excitation region with the photoion time-of-flight method and monochromatized synchrotron radiation. An unusual spectrum with paired windows structure was found instead of a simple regular Rydberg series. Such subsidiary windows have not been observed in the 3s→ np resonances of Ar, which has a closed outer shell. Based on Dirac-Fock calculations, the dual window structure at 36.7 eV and at 37.4 eV was assigned to the 3s-13p64s4p resonance. The line shape can be fitted by Fano's formula and the Fano parameters were obtained.View full abstractDownload PDF (136K) -
Shinsuke Maki, Sadao Masamune, Kiyoyuki Yanbe, Junya Sekikawa, Arimoto ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1680-1683
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSIn reversed field pinches (RFPs), edge fast electrons play some important roles in the energy transport and RFP dynamo. There have been here detailed measurements of electron currents and floating potential with electrostatic probes at the edge region, showing that field-aligned current is carried by superthermal electrons, which results in reversed toroidal current outside the reversal surface. The time evolution of radial electric field, which is estimated from that of floating potential measured with insertable probes with some assumptions, revealed that radially outward electric field is formed in about 100 μs. Given that the radial electric field is a result of superthermal electron diffusion in a stochastic magnetic field line, then the estimated diffusion coefficient agrees well with the numerically calculated values, which were obtained by using Monte-Carlo particle orbit calculation in combination with a 3-dimentional nonlinear MHD simulation. It is concluded that the radial electric field is formed by stochastic diffusion of superthermal electrons, which also play important roles in RFP dynamo.View full abstractDownload PDF (130K) -
Yutaka Matsumoto, Shun-ichi Oikawa, Tsuguhiro WatanabeArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1684-1693
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSMagnetic field lines and particle orbits were analyzed in the periphery of the Large Helical Device (LHD), which is called the chaotic field line region in this paper. The widths of the chaotic field line region were numerically identified for the standard LHD configuration with the magnetic axis position Rax = 3.75 m and for an improved confinement configuration with Rax = 3.6 m. It was found that the reflected particles include of what we have named chaotic particles and non-chaotic particles. Most of the reflected particles are mirror-confined with strong adiabaticity in the chaotic field line region. The remaining reflected particles, named type-A and type-B particles, are harmful to confinement. We found by detailed analysis of the vacuum magnetic field in the LHD that there exist loss canals that are the open intersections of |B| = const. and B · ∇ B = 0 with (B · ∇)2B > 0. The type-A particles, which are deeply trapped in the intersections and exhibit non-chaotic behavior, are lost along the loss canal due to grad-B drift, and may cause a toroidal drift in the chaotic field line region. The type-B particles, which exhibit chaotic behavior, pass into and out of the last closed magnetic surface (LCMS), leading to cooling down of the core plasma through collisions with cold neutrals in the chaotic field line region. When field strengths at the inner and the outer edge of the LCMS are different, type-B particles are produced through constancy of the kinetic energy and the magnetic moment of the collisionless particles. It was also found that the standard LHD configuration, Rax = 3.75 m, has both type-A and type-B particles, while there are virtually no such particles in the Rax = 3.6 m configuration. In the latter configuration, there is no loss canal within the chaotic field region, and the field strengths at both edges of the LCMS are the same. It is therefore concluded that the improved LHD confinement with Rax = 3.6 m over Rax = 3.75 m is a result of reductions and/or removal of type-A and type-B particles.View full abstractDownload PDF (1747K) -
Yukihiko Kawamura, Hiroyuki Mashiyama, Katsuhiko HasebeArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1694-1697
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe cubic-tetragonal phase transition of CH3NH3PbI3 was investigated by single crystal X-ray diffractometry. The crystal structure was refined at five temperatures in the teragonal phase. The PbI6 octahedron rorates around the c-axis alternatively to construct the SrTiO3-type tetragonal structure. A methylammonium ion is partially orderd; 24 disordered states in the cubic phase are reduced to 8. With decreasing temperature, the rotation angle of the octahedron increases monotonically, which indicates it is an order parameter of the cubic-tetragonal transition.View full abstractDownload PDF (129K) -
Daniil G. Sannikov, Hiroyuki MashiyamaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1698-1700
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSTheoretical phase diagrams for {N(CH3)4}2CuBr4 crystal are constructed using the phenomenological approach developed earlier for {N(CH3)4}2MCl4 family crystals. Expressions for thermodynamic potentials of the phases presented on the experimental phase diagram, and for boundaries between these phases are derived. The theoretical temperature-pressure phase diagram is plotted and is found to be in agreement with the experimental diagram. The approximations and assumptions made when constructing theoretical diagrams are discussed.View full abstractDownload PDF (80K) -
Yutaka Nishio, Yuko Mori, Sachie Sasaki, Koji Kajita, Shuji Aonuma, Hi ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1701-1704
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSIn the course of studies on thermal properties of (DMe-DCNQI)2Cu systems that exhibit a reentrant metal-insulator transition, we discovered a Schottky type of specific heat with a peak around 8 K. The peak value exceeds 25 J/mol·K. This type of anomaly is observed only on samples composed of molecules containing partially deuterated methyl groups, and was found to be originated from the rotation of deuterated methyl groups that occurs by quantum tunneling. From an analysis of the specific heat curve, we obtained information concerning the low lying energy level scheme of deuterated methyl group CH2D. It has a non-degenerated ground state and doubly degenerated first excited states located about 20 K above the ground state.View full abstractDownload PDF (661K) -
Satoshi Yotsuhashi, Hideaki MaebashiArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1705-1711
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSNumerical renormalization-group results on entropy of the anisotropic two-channel Kondo model with the band-width cutoff (D) in the presence of a magnetic field (h) are obtained to determine crossover temperature from the non-Fermi liquid to Fermi liquid fixed point. It is found that the crossover temperature (Tx) is given by Tx≡rTK∼ D(Δ J/Jav)2 e-1/Jav when (h /TK)2 « r « 1 , where TK, Jav and Δ J are the Kondo temperature, the average and difference of the exchange coupling constants, respectively. This result indicates that non-Fermi liquid behavior can be seen even if Δ J » TK. Robust similarities of the crossover behavior in the region around the non-Fermi liquid critical point to that of the two-impurity Kondo model are also discussed.View full abstractDownload PDF (189K) -
Tamaki Ise, Hiroshi AkeraArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1712-1715
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe diagonal conductivity of two-dimensional electron systems in strong magnetic fields is derived in an analytical form by considering tunneling processes through a saddle point of the slowly-fluctuating potential in the high electron-temperature regime where the breakdown of the integer quantum Hall effect occurs. The calculation is made for a two-dimensional periodic potential modulation with a fixed amplitude equal to the Landau level separation. The electron-temperature dependence of the conductivity is mainly determined by the presence of an activation energy. It is found that an estimated value of the conductivity in the present model at even-integer filling factors is smaller by an order of magnitude than the experimental value in the integer quantum Hall effect breakdown regime.View full abstractDownload PDF (108K) -
Yoshiro Shimojo, Takehiko Ishiguro, Hideki Yamochi, Gunzi SaitoArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1716-1720
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe upper critical field Hc2 of the layered superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Cl under the pressure of 1-2 kbar has been studied under the magnetic field applied parallel to the superconducting plane. The Hc2 changes with temperature almost linearly and exceeds the BCS Pauli paramagnetic limit near 0 K. By taking into account the sharp local minimum of the resistance in the parallel orientation of the magnetic field to the layer, the Hc2 is discussed in relation to the inhomogeneous order-parameter state. The coherence lengths are determined as 20±3 and 0.8±0.2 nm parallel and perpendicular to the layer from the temperature dependence of Hc2 near Tc, while the corresponding lengths are 13±1 and 1.3±0.1 nm from Hc2 at 0 K, respectively, for the crystal under the pressure of 1.9 kbar. The origin of the difference is discussed.View full abstractDownload PDF (644K) -
Yusuke Kato, Nobuhiko HayashiArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1721-1727
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe impurity problems within vortex cores of two-dimensional s-wave and chiral p-wave superconductors are studied numerically in the framework of the quasiclassical theory of superconductivity and self-consistent Born approximation under a trial form of the pair potential. The dispersion and impurity scattering rate (the inverse of the relaxation time) of the Andreev bound state localized in vortex cores are deduced from the angular-resoloved local density of states. The energy dependence of the impurity scattering rates depends on the pairing symmetry; particularly, in the chiral p-wave vortex core where chirality and vorticity have opposite sign and hence the total angular momentum is zero, the impurities are ineffective and the scattering rate is vanishingly small. Owing to the cancellation of angular momentum between chirality and vorticity, the chiral p-wave vortex core is similar to locally realized s-wave region and therefore non-magnetic impurity is harmless as a consequence of Anderson's theorem. The results of the present study confirm the previous results of analytical study [J. Phys. Soc. Jpn. 69 (2000) 3378] in the Born limit.View full abstractDownload PDF (243K) -
Jin-Young Son, Kozo Okazaki, Takashi Mizokawa, Atsushi Fujimori, Takes ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1728-1731
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSWe have studied the electronic structure of MnSi, which shows a helical spin ordering below 30 K, by ultraviolet photoemission spectroscopy. We have attempted to separate the spectra into surface and bulk components by considering the electron mean-free path and the thickness of the outermost atomic layer. The `bulk' spectra thus obtained are compared with the density of states given by band-structure calculation corrected for model self-energies and reasonable agreement was obtained. This indicates that both band structure and electron correlation effects are important to understand the physical properties of MnSi. The spectra in the entire valence-band region do not show appreciable temperature dependence, but the spectral weight in the vicinity of the Fermi level is slightly decreased with decreasing temperature, which we tentatively attribute to the exchange splitting of the Mn 3d bands.View full abstractDownload PDF (298K) -
Hiroyuki OhsumiArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1732-1739
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSX-ray diffraction measurements have been performed on a single crystal sample of the rare earth metal holmium. The temperature and magnetic field dependence of the c-lattice parameter was studied in detail below the Néel temperature of 132 K. Magnetic structural phase transitions were observed as a change in the c-lattice parameter. In addition, lattice modulations induced by the magnetic structure were investigated by observing satellite reflections. A model based on the exchange magnetostriction can explain these magnetostrictive behaviors. The magnetic structures which were used in the analysis were reproduced by the self-consistent mean field calculation. The model has explained the temperature and magnetic field dependence of the c-lattice parameter, as well as the behaviors of the wave number and the amplitude of the lattice modulation.View full abstractDownload PDF (643K) -
Kazuko Zenmyo, Hidenori Kubo, Hiroyuki Deguchi, Kazuyoshi TakedaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1740-1745
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSProton NMR measurements of Fe1-xMnxCl2·2H2O are carried out. In the Mn-type antiferromagnetic phase all spins are parallel to the b-axis which is the easy axis of MnCl2·2H2O. In the Fe-type antiferromagnetic phase, for Fe-rich region, all spins are parallel to the α-axis which is the easy axis of FeCl2·2H2O, and with increasing Mn concentration some Mn spins tilt from the α-axis. In the “intermediate” phase Fe- or Mn-type (oblique) antiferromagnetic spins coexist with the spin glass spins. All spins lie in the α b-plane with the angle depending on the Mn concentration.View full abstractDownload PDF (170K) -
Kenji Ohoyama, Kentaro Indoh, Aya Tobo, Hideya Onodera, Yasuo Yamaguch ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1746-1751
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSWe have investigated magnetic properties of ErB2C2 which is an isostructural compound of the antiferroquadrupolar ordering materials, DyB2C2 and HoB2C2, by magnetisation and neutron diffraction measurements. ErB2C2 shows magnetic transitions at TN = 15.9 K and Tt = 13.0 K. The magnetic structure of the ground state is a simple Ising-type antiferromagnetic one with a propagation vector of k=(1, 0, 0). The intermediate phase between TN and Tt under zero magnetic field is a long range magnetic ordered state with a transverse sinusoidal modulation with a propagation vector of (1+δ, δ, 0), where δ=0.1120(2) which is nearly the same as that in phase IV in HoB2C2.View full abstractDownload PDF (247K) -
Makoto Yoshida, Keiichi Koyama, Takahiro Tomimatsu, Makoto Shirakawa, ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1752-1756
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSCyclotron resonance (CR) measurements on a single crystal of LaSb have been performed in the temperature range from 1.6 K to 40 K in the frequency range from 50 to 190 GHz. We have observed three CR absorption lines at low temperature. For magnetic fields parallel to the [100] direction, the determined effective masses are 0.20± 0.02m0, 0.17± 0.02m0, and 0.45± 0.04m0, which correspond to the α-branch, the β-branch, and the γ-branch, respectively.View full abstractDownload PDF (176K) -
Kiyoko Yamanaka, Tetsuya KatoArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1757-1760
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSIn order to clarify structural and magnetic phase transitions of a hexagonal triangular antiferromagnet TlFeCl3, dielectric and magnetic susceptibilities, D-E hysteresis loops and optical birefringence were measured. Successive structural phase transitions at 179 K(T2), 83 K(T3) and 79 K(T4) were identified. At a range of temperatures T4 < T < T3 (phase IV), opened D-E loops were clearly observed. The dielectric behavior of the successive structural phase transitions of TlFeCl3 were confirmed to be quite similar to those of KNiCl3 and RbMnBr3 which are Group I of KNiCl3-family crystals.View full abstractDownload PDF (145K) -
Noboru Miyata, Mihiro Yanagihara, Masamitsu Watanabe, Yoshihisa Harada ...Article type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1761-1764
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSN 1s resonance emission spectra in hexagonal BN was measured with high energy resolution at an undulator beamline. It was found that π emission is very weak in the spectator emission, while both π and σ components are present in the normal emission. This π emission anomaly has been explained in terms of the Coulombic effect of the core hole on the localized N 2pz valence orbital. The π emission anomaly is quite analogous to the case of the B 1s resonance emission observed in the previous study.View full abstractDownload PDF (157K) -
Masayuki Kanazawa, Kazunari Hagiwara, Jun Kokubun, Kohtaro IshidaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1765-1770
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe pre-edge peak as well as the main peak just above the Fe K-absorption edge is observed for anisotropic tensor of susceptibility (ATS) scattering in magnetite, Fe3O4 (inverse spinel structure). In order to investigate the origin of the peaks, we study the ATS scattering in franklinite, ZnFe2O4 (normal spinel structure) which has Zn atoms in the tetrahedral A sites and Fe atoms in the octahedral B sites. In franklinite, only the main ATS peak is observed at almost the same energy as magnetite. Therefore, the pre-edge and main peaks of magnetite originate from the A and B site atoms, respectively. Because the dipole transition of A site atoms cannot excite ATS scattering, the dipole-quadrupole transition is investigated. The observed energy spectra for the (002) and (006) reflections in magnetite reveal that the pre-edge peak is due to the dipole-quadrupole transition of Fe atoms in the A sites. Comparing the main peak intensities of both reflections in magnetite and franklinite, we conclude that the main peak in franklinite is caused by dipole transition of the B site atoms. However the contribution of dipole-quadrupole transition is presumed in magnetite.View full abstractDownload PDF (196K) -
Jun-ichi Igarashi, Tatsuya NagaoArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1771-1779
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSWe calculate the resonant x-ray scattering (RXS) spectra near the Ce LIII absorption edge in CeB6, on the basis of a microscopic model that the 4ƒ states of Ce are atomic while the 5d states form an energy band with a reasonable density of states. In the initial state, we employ an effective Hamiltonian of Shiina et al. [J. Phys. Soc. Jpn. 66 (1997) 1741] in the antiferro-quadrupole (AFQ) ordering phase, while we construct the wave function consistent with the neutron scattering experiment in the magnetic ground state. In the intermediate state, we take full account of the intra-atomic Coulomb interaction. Without assuming any lattice distortion, we obtain sufficient RXS intensities on the AFQ superlattice spot. We obtain the spectral shape, the temperature and magnetic field dependences in good agreement with the experiment, thus demonstrating the mechanism that the intensity is brought about by the modulation of 5d states through the anisotropic term of the 5d-4ƒ Coulomb interaction. In the magnetic ground state, a small pre-edge peak is found by the E2 process. On the magnetic superlattice spot, we get a finite but considerably small intensity. The magnetic form factor is briefly discussed.View full abstractDownload PDF (265K) -
Akiyoshi Shibuya, Yukio Saito, Hiroyuki HyugaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1780-1788
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSThe shape deformation of a three-dimensional axisymmetric vesicle with encapsulated filaments or impurities is analyzed by integrating a dissipative dynamics. This method can incorporate systematically the constraint of a fixed surface area and/or a fixed volume. The filament encapsulated in a vesicle is assumed to take a form of a rod or a ring so as to imitate cytoskeletons. In both cases, results of the shape transition of the vesicle are summarized in phase diagrams in the phase space of the vesicular volume and a rod length or a ring radius. We also study the dynamics of a vesicle with impurities coupled to the membrane curvature. The phase separation and the associated shape deformation in the early stage of the dynamical evolution can well be explained by the linear stability analysis. Long runs of simulation demonstrate the nonlinear coarsening of the wavy deformation of the vesicle in the late stage.View full abstractDownload PDF (490K) -
Takao Mori, Shigeki OtaniArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1789-1792
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSDownload PDF (157K) -
Shigeki Otani, Takao MoriArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1791-1792
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSDownload PDF (151K) -
Kazuaki NaritaArticle type: General Physics
Subject area: Mathematical methods in physics.
2002 Volume 71 Issue 7 Pages 1793
Published: 2002
Released on J-STAGE: April 25, 2003
JOURNAL RESTRICTED ACCESSDownload PDF (40K)
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