High-magnetic-field X-ray absorption spectroscopy of field-induced valence transition in EuNi2(Si1-xGex)2

Yasuhiro H. Matsuda; Toshiya Inami; Kenji Ohwada; Yuto Murata; Hiroyuki Nojiri; Youichi Murakami; Akihiro Mitsuda; Hirofumi Wada; Hiroshi Miyazaki; Isao Harada

doi:10.1143/JPSJ.77.054713

High-magnetic-field X-ray absorption spectroscopy of field-induced valence transition in EuNi₂(Si_1-xGe_x)₂

Yasuhiro H. Matsuda, Toshiya Inami, Kenji Ohwada, Yuto Murata, Hiroyuki Nojiri, Youichi Murakami, Akihiro Mitsuda, Hirofumi Wada, Hiroshi Miyazaki, Isao Harada

IMR - Institute for Materials Research (institute affiliation only)

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

The magnetic-field-induced valence transition in EuNi₂(Si _1-xGe_x)₂ (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 υ* = 2.75 at a zero field to υ* = 2.33 at 40 T for x = 0.82. The results are analyzed using a theoretical model. The hybridization parameter V between the Eu²⁺ and Eu³⁺ states and the energy separation ΔE are determined, which are crucial for quantum mechanical mixing.

Original language	English
Article number	054713
Journal	Journal of the Physical Society of Japan
Volume	77
Issue number	5
DOIs	https://doi.org/10.1143/JPSJ.77.054713
Publication status	Published - 2008 May

Keywords

Pulsed magnetic field
Valence transition
X-ray absorption

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title = "High-magnetic-field X-ray absorption spectroscopy of field-induced valence transition in EuNi2(Si1-xGex)2",

abstract = "The magnetic-field-induced valence transition in EuNi2(Si 1-xGex)2 (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 υ* = 2.75 at a zero field to υ* = 2.33 at 40 T for x = 0.82. The results are analyzed using a theoretical model. The hybridization parameter V between the Eu2+ and Eu3+ states and the energy separation ΔE are determined, which are crucial for quantum mechanical mixing.",

keywords = "Pulsed magnetic field, Valence transition, X-ray absorption",

author = "Matsuda, {Yasuhiro H.} and Toshiya Inami and Kenji Ohwada and Yuto Murata and Hiroyuki Nojiri and Youichi Murakami and Akihiro Mitsuda and Hirofumi Wada and Hiroshi Miyazaki and Isao Harada",

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doi = "10.1143/JPSJ.77.054713",

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T1 - High-magnetic-field X-ray absorption spectroscopy of field-induced valence transition in EuNi2(Si1-xGex)2

AU - Matsuda, Yasuhiro H.

AU - Inami, Toshiya

AU - Ohwada, Kenji

AU - Murata, Yuto

AU - Nojiri, Hiroyuki

AU - Murakami, Youichi

AU - Mitsuda, Akihiro

AU - Wada, Hirofumi

AU - Miyazaki, Hiroshi

AU - Harada, Isao

PY - 2008/5

Y1 - 2008/5

N2 - The magnetic-field-induced valence transition in EuNi2(Si 1-xGex)2 (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 υ* = 2.75 at a zero field to υ* = 2.33 at 40 T for x = 0.82. The results are analyzed using a theoretical model. The hybridization parameter V between the Eu2+ and Eu3+ states and the energy separation ΔE are determined, which are crucial for quantum mechanical mixing.

AB - The magnetic-field-induced valence transition in EuNi2(Si 1-xGex)2 (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 υ* = 2.75 at a zero field to υ* = 2.33 at 40 T for x = 0.82. The results are analyzed using a theoretical model. The hybridization parameter V between the Eu2+ and Eu3+ states and the energy separation ΔE are determined, which are crucial for quantum mechanical mixing.

KW - Pulsed magnetic field

KW - Valence transition

KW - X-ray absorption

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DO - 10.1143/JPSJ.77.054713

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JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - 5

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ER -

High-magnetic-field X-ray absorption spectroscopy of field-induced valence transition in EuNi₂(Si_1-xGe_x)₂

Abstract

Keywords

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