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Magnetic State in Iron Hydride Under Pressure Studied by X-ray Magnetic Circular Dichroism at the Fe K-edge

Published online by Cambridge University Press:  01 February 2011

Naoki Ishimatsu
Affiliation:
naoki@sci.hiroshima-u.ac.jp, Hiroshima university, Graduate school of science, Higashi-Hiroshima, Japan
Yasuharu Matsushima
Affiliation:
b054010@hiroshima-u.ac.jp, Hiroshima university, Graduate school of science, Higashi-Hiroshima, Japan
Hiroshi Maruyama
Affiliation:
maruyama@sci.hiroshima-u.ac.jp, Hiroshima university, Graduate school of science, Higashi-Hiroshima, Japan
Takao Tsumuraya
Affiliation:
t-tsumuraya@northwestern.edu, Hiroshima University, Gradate School of Advanced Science of Matter, Higashi-Hiroshima, Japan
Tamio Oguchi
Affiliation:
oguchi@hiroshima-u.ac.jp, Hiroshima University, Gradate School of Advanced Science of Matter, Higashi-Hiroshima, Japan
Naomi Kawamura
Affiliation:
naochan@spring8.or.jp, Japan Synchrotron Research Institute, Kouto, Sayo, Japan
Masaichiro Mizumaki
Affiliation:
mizumaki@spring8.or.jp, Japan Synchrotron Research Institute, Kouto, Sayo, Japan
Takahiro Matsuoka
Affiliation:
tmatsuoka@spring8.or.jp, Japan Synchrotron Research Institute, Kouto, Sayo, Japan
Kenichi Takemura
Affiliation:
TAKEMURA.Kenichi@nims.go.jp, National Institute for Materials Science, Namiki, Tsukuba, Japan
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Abstract

In order to study magnetic states in Fe-hydride under pressure, X-ray magnetic circular dichroism (XMCD) at the Fe K-edge has been measured up to 27.5 GPa. As a result, hydrogenation from bcc-Fe to dhcp-FeH occurs within a narrow region of 3.2-3.8 GPa, which is clearly observed by the dichroic profile in dhcp-FeH differing from that in bcc-Fe. Influence of H atoms on Fe 3d and 4p electronic states is discussed using the pressure-dependent XMCD and the first-principles calculation.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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Magnetic State in Iron Hydride Under Pressure Studied by X-ray Magnetic Circular Dichroism at the Fe K-edge
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