Thermal expansion of a Au-Al-Yb intermediate valence quasicrystal

Watanuki, Tetsu; Kashimoto, Shiro*; Ishimasa, Tsutomu*; Machida, Akihiko; Yamamoto, Shin*; Tanaka, Yukinori*; Mizumaki, Masaichiro*; Kawamura, Naomi*; Watanabe, Shinji*

Solid State Communications, 211, p.19 - 22, 2015/06

https://doi.org/10.1016/j.ssc.2015.03.008

The thermal expansion of a Au-Al-Yb intermediate-valence quasicrystal has been studied by X-ray diffraction measurements. We have found anomalous thermal expansion behavior, namely zero thermal expansion below 50 K. By comparison with an isostructural Au-Al-Tm quasicrystal, the contribution of the Yb valence variation was extracted, and it was shown that its negative thermal expansion component due to the valence shift toward the divalent state by cooling compensated for the positive thermal expansion of the original lattice.

Theory of mechanical spin current generation via spin-rotation coupling

Ieda, Junichi; Matsuo, Mamoru; Maekawa, Sadamichi

Solid State Communications, 198, p.52 - 56, 2014/11

https://doi.org/10.1016/j.ssc.2014.02.003

Theory of the acoustic spin pumping

Adachi, Hiroto; Maekawa, Sadamichi

Solid State Communications, 198, p.22 - 25, 2014/11

https://doi.org/10.1016/j.ssc.2014.02.030

Spin pumping refers to the spin current injection driven by magnetization dynamics from a ferromagnet into adjacent nonmagnetic conductors. Conventionally, ferromagnetic resonance is used to drive the magnetization dynamics and the spin pumping. Recently a new type of spin pumping driven by acoustic waves, i.e., the acoustic spin pumping, has been reported. We present a linear-response theory of the acoustic spin pumping.

Large reversible magnetocaloric effect in ferromagnetic semiconductor EuS

Li, D. X.*; Yamamura, Tomoo*; Nimori, Shigeki*; Homma, Yoshiya*; Honda, Fuminori*; Haga, Yoshinori; Aoki, Dai*

Solid State Communications, 193, p.6 - 10, 2014/09

https://doi.org/10.1016/j.ssc.2014.05.024

Electronic configuration of Mn ions in the - molecular ferromagnetic -Mn phthalocyanine studied by soft X-ray magnetic circular dichroism

Kataoka, Takashi*; Sakamoto, Yuta*; Yamazaki, Yo*; Singh, V. R.*; Fujimori, Atsushi*; Takeda, Yukiharu; Okochi, Takuo*; Fujimori, Shinichi; Okane, Tetsuo; Saito, Yuji; et al.

Solid State Communications, 152(9), p.806 - 809, 2012/05

https://doi.org/10.1016/j.ssc.2012.01.036

no abstracts in English

Vibrational spectroscopy studies of a pressure-induced disproportionation reaction of LaH

Sakurai, Yoko*; Machida, Akihiko; Aoki, Katsutoshi

Solid State Communications, 151(11), p.815 - 817, 2011/06

https://doi.org/10.1016/j.ssc.2011.03.028

The pressure-induced disproportionation reaction of LaH was investigated by infrared reflection and Raman measurements at ambient temperature. The relative reflection intensity began to decrease significantly at a pressure of about 12 GPa and fell to 10% of the initial value at 20 GPa. Absorption peaks at pressures above 14 GPa were assigned to the hydrogen vibrations at the tetrahedral and octahedral sites of the fcc metal lattice, respectively. These infrared results indicated insulating LaH precipitated from metallic LaH.

Determination of crystal structure and charge density of (BaSr)(CoFe)O by Rietveld refinement and maximum entropy method analysis

Ito, Takanori*; Nishida, Yuki*; Tomita, Aya*; Fujie, Yoshinori*; Kitamura, Naoto*; Idemoto, Yasushi*; Osaka, Keiichi*; Hirosawa, Ichiro*; Igawa, Naoki

Solid State Communications, 149(1-2), p.41 - 44, 2009/01

https://doi.org/10.1016/j.ssc.2008.10.020

The crystal structure and charge density of (BaSr)(CoFe)O were investigated by the Rietveld refinement method and the maximum entropy method by using neutron and synchrotron X-ray diffraction. The crystal structure was refined by using the split atom model to cation sites with the space group, . The site occupancies of O1(4) and O2(8) sites were 0.59 and 0.87, respectively. It was found that the (Co, Fe)-O2 plane in the sample has anisotropic covalent and ionic bands, and that the (Ba, Sr)-O1 bond was ionic with a low charge density.

X-ray diffraction investigation of the hexagonal-fcc structural transition in yttrium trihydride under hydrostatic pressure

Machida, Akihiko; Omura, Ayako; Watanuki, Tetsu; Ikeda, Takashi; Aoki, Katsutoshi; Nakano, Satoshi*; Takemura, Kenichi*

Solid State Communications, 138(9), p.436 - 440, 2006/06

https://doi.org/10.1016/j.ssc.2006.04.011

no abstracts in English

Electrical and magnetic properties of pseudo-one-dimensional calcium iridium oxide CaIrO

Wakeshima, Makoto*; Taira, Nobuyuki*; Hinatsu, Yukio*; Ishii, Yoshinobu

Solid State Communications, 125(6), p.311 - 315, 2003/02

https://doi.org/10.1016/S0038-1098(02)00823-2

no abstracts in English

In situ EXAFS study on GeS glass under high-pressure

Miyauchi, Koichi*; Qiu, J.*; Shojiya, Masanori*; Kawamoto, Yoji*; Kitamura, Naoyuki*; Fukumi, Kohei*; Katayama, Yoshinori; Nishihata, Yasuo

Solid State Communications, 124(5-6), p.189 - 193, 2002/10

https://doi.org/10.1016/S0038-1098(02)00489-1

A GeS glass was compressed up to 8 GPa at room temperature, heated up to 270 C under 8 GPa and then decompressed to ambient pressure at room temperature, using a large volume high-pressure apparatus. The local structural-changes around Ge were examined by means of EXAFS method. The Ge-S bond length became monotonously short with increasing applied-pressure up to 8 GPa at room temperature. When the specimen was heated to 270 C under 8 GPa, however, the vond length became slightly long. The elongated bond lengthe was almost kept even after the temperature was descended to room tempertature. In decompression process, the bond length became gradually long with releasing applied-pressure down to 2 GPa, following a change in compression process. Below 2 GPa, however, the Ge-S bond length was largely elongated, being lnger than the initial one. No significant change of coordination number was found in the compression and decompression processes up to 8 GPa. This change canbe explained by a combined effect of elastic and inelastic structural-changes.