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Journal Articles

Bipartite magnetic parent phases in the iron oxypnictide superconductor

Hiraishi, Masatoshi*; Iimura, Soshi*; Kojima, Kenji*; Yamaura, Junichi*; Hiraka, Haruhiro*; Ikeda, Kazutaka*; Miao, P.*; Ishikawa, Yoshihisa*; Torii, Shuki*; Miyazaki, Masanori*; et al.

Nature Physics, 10(4), p.300 - 303, 2014/04

https://doi.org/10.1038/nphys2906

Times Cited Count：103 Percentile：95.39(Physics, Multidisciplinary)

Journal Articles

High-magnetic-field X-ray absorption spectroscopy of field-induced valence transition in EuNi(Si $_{1-x}$ Ge)

Matsuda, Yasuhiro*; Inami, Toshiya; Owada, Kenji; Murata, Yuto*; Nojiri, Hiroyuki*; Murakami, Yoichi*; Mitsuda, Akihiro*; Wada, Hirofumi*; Miyazaki, Hiroshi*; Harada, Isao*

Journal of the Physical Society of Japan, 77(5), p.054713_1 - 054713_7, 2008/05

https://doi.org/10.1143/JPSJ.77.054713

Times Cited Count：25 Percentile：74.36(Physics, Multidisciplinary)

The magnetic-field-induced valence transition in EuNi(Si $_{1-x}$ Ge) (x=0.82, 0.85) has been studied by X-ray absorption spectroscopy at low temperatures. The field dependence of the Eu valence is directly observed for the first time. We find a significant decrease in the valences at high magnetic fields above 40 T. The valence of Eu changes from v = 2.75 at a zero field to v = 2.33 at 40 T for x = 0.82. The results are analyzed using a theoretical model. The hybridization parameter V between the Eu $^{2+}$ and Eu $^{3+}$ states and the energy separation are determined, which are crucial for quantum mechanical mixing.