検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

High-magnetic-field X-ray absorption and magnetic circular dichroism spectroscopy in the mixed-valent compound YbAgCu$$_4$$

混合原子価化合物YbAgCu$$_4$$の高磁場下X線吸収分光及び円二色性の測定

中村 俊幸*; 松田 康弘*; Her, J.-L.*; 金道 浩一*; 道村 真司*; 稲見 俊哉; 水牧 仁一朗*; 河村 直己*; 鈴木 基寛*; Chen, B.*; 太田 寛人*; 吉村 一良*; 小谷 章雄*

Nakamura, Toshiyuki*; Matsuda, Yasuhiro*; Her, J.-L.*; Kindo, Koichi*; Michimura, Shinji*; Inami, Toshiya; Mizumaki, Masaichiro*; Kawamura, Naomi*; Suzuki, Motohiro*; Chen, B.*; Ota, Hiroto*; Yoshimura, Kazuyoshi*; Kotani, Akio*

価数揺動系であるYbAgCu$$_4$$のX線吸収分光と円二色性の測定を35Tまで行い、得られた価数のH-T相図と磁化を比較することから、メタ磁性転移の起源が価数転移であることを明らかにした。円二色性はYb$$^{3+}$$でのみ観測され、Yb$$^{2+}$$では観測されなかった、一方で、四重極遷移に伴う円二色性スペクトルを観測し、理論計算からこれを明らかにした。

The X-ray absorption and magnetic circular dichroism (MCD) spectra at the Yb L$$_3$$ edge were measured in the mixed-valent heavy fermion compound YbAgCu$$_4$$ at high magnetic fields and low temperatures. The magnetic-field-temperature (H-T) phase boundary determined by the valence state is in very good agreement with that determined by the magnetization. It is clearly found that the metamagnetism of this compound is due to the field induced valence transition. A distinctive positive peak of the XMCD spectra appears in the vicinity of the white line of the absorption due to Yb$$^{3+}$$ state, while no feature is observed in the XMCD spectra corresponding to the Yb$$^{2+}$$ state. A small negative XMCD peak was observed at a lower energy and was attributed to the quadrupole trasition from theoretical calcuration, which explains its peculicar magnetic field dependence.

Access

:

- Accesses

InCites™

:

パーセンタイル:37.58

分野:Physics, Multidisciplinary

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.