Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Moritomo, Yutaka*; Matsuda, Tomoyuki*; Fuchikawa, Ryota*; Abe, Yuta; Kamioka, Hayato*
Journal of the Physical Society of Japan, 80(2), p.024603_1 - 024603_5, 2011/02
Times Cited Count:4 Percentile:33.73(Physics, Multidisciplinary)Kohara, Shinji*; Kato, Kenichi*; Kimura, Shigeru*; Tanaka, Hitoshi*; Usuki, Takeshi*; Suzuya, Kentaro; Tanaka, Hiroshi*; Moritomo, Yutaka*; Matsunaga, Toshiyuki*; Yamada, Noboru*; et al.
Applied Physics Letters, 89(20), p.201910_1 - 201910_3, 2006/11
Times Cited Count:203 Percentile:97.87(Physics, Applied)The three-dimensional atomic configuration of amorphous GeSbTe were derived by reverse Monte Carlo simulation with synchrotron-radiation X-ray diffraction data. The authors found that amorphous GeSbTe can be regarded as "even-numbered ring structure", because the ring statistics is dominated by four- and six-fold rings analogous to the crystal phase. On the other hand, the formation of Ge-Ge homopolar bonds in amorphous GeTe constructs both odd- and even-numbered rings. They believe that the unusual ring statistics of amorphous GeSbTe is the key for the fast crystallization speed of the material.
Ishii, Kenji; Inami, Toshiya; Owada, Kenji; Kuzushita, Kaori; Mizuki, Junichiro; Murakami, Yoichi; Ishihara, Sumio*; Endo, Yasuo*; Maekawa, Sadamichi*; Hirota, Kazuma*; et al.
Journal of Physics and Chemistry of Solids, 66(12), p.2157 - 2162, 2005/12
Times Cited Count:0 Percentile:0(Chemistry, Multidisciplinary)We have studied electronic excitations of hole-doped manganese oxides LaSrMnO ( and ) by resonant inelastic X-ray scattering at Mn K absorption edge. We observed in the excitation spectra that the Mott gap of LaSrMnO was filled by hole-doping. In LaSrMnO, which shows a metal-insulator transition, we found that temperature dependence of scattering intensity is different between two scattering vectors. It may reflects a anisotropic electronic structure which originates from the orbital degrees of freedom in manganese oxides.
Agui, Akane; Butorin, S. M.*; Kmbre, T.*; Sthe, C.*; Saito, Tomohiko*; Moritomo, Yutaka*; Nordgren, J.*
Journal of the Physical Society of Japan, 74(6), p.1772 - 1776, 2005/06
Times Cited Count:8 Percentile:48.31(Physics, Multidisciplinary)no abstracts in English
Ishii, Kenji; Inami, Toshiya; Owada, Kenji; Kuzushita, Kaori; Mizuki, Junichiro; Murakami, Yoichi; Ishihara, Sumio*; Endo, Yasuo*; Maekawa, Sadamichi*; Hirota, Kazuma*; et al.
Physical Review B, 70(22), p.224437_1 - 224437_6, 2004/12
Times Cited Count:19 Percentile:64.32(Materials Science, Multidisciplinary)Electronic excitations in the hole doped manganese oxides (LaSrMnO, and ) have been elucidated by using the resonant inelastic X-ray scattering (RIXS) method. A doping effect in the strongly correlated electron systems has been observed for the first time. The scattering spectra show that a salient peak appears in low energies indicating the persistence of the Mott gap. At the same time, the energy gap is partly filled by doping holes and the spectral weight energy shifts toward lower energies. The excitation spectra show little change in the momentum space as is in undoped LaMnO. On the other hand, the scattering intensities in the low energy excitations of are anisotropic in temperature dependence, which indicates an anisotropy of magnetic interaction and underlying effect of the orbital.
Machida, Akihiko; Moritomo, Yutaka*; Oyama, Kenji*
Journal of the Physical Society of Japan, 72(5), P. 1312, 2003/05
In order to investigate interrelation between the lattice structure and the magnetic structure, we have performed Rietveld structural analysis on the neutron powder patterns for TbCaMnO at low temperature. In the concentration range of , we observed the Bragg reflections due to the CE-like- and C-type structures. In this range, the powder patterns were reproduce by the two-phase model with and symmetries. The fractions of these phases change against concentration . This variation of the fraction for the phase is similar to the variation of the integrated intensities of the CE-like-type magnetic Bragg reflections. This indicates that the phase is responsible for the CE-like spin-ordering. Furthermore, we discussed interrelation between the detailed lattice structure and magnetic structure.
Ishii, Kenji; Inami, Toshiya; Owada, Kenji; Kuzushita, Kaori*; Mizuki, Junichiro; Murakami, Yoichi*; Ishihara, Sumio*; Endo, Yasuo*; Maekawa, Sadamichi*; Hirota, Kazuma*; et al.
no journal, ,
no abstracts in English
Fuchikawa, Ryota*; Abe, Yuta; Matsuda, Tomoyuki*; Kamioka, Hayato*; Moritomo, Yutaka*
no journal, ,
no abstracts in English