Neutron diffraction study of magnetic structure and successive 5f electronic transition in the itinerant antiferromagnet NpRh Ga5

Shintaro Jonen, Naoto Metoki, Fuminori Honda, Koji Kaneko, Etsuji Yamamoto, Yoshinori Haga, Dai Aoki, Yoshiya Homma, Yoshinobu Shiokawa, Yoshichika Onuki

研究成果: Contribution to journalArticle査読

23 被引用数 (Scopus)

抄録

Neutron diffraction experiments have been carried out in a single crystal of NpRh Ga5 in order to reveal the magnetic structure and 5f electronic state. This material exhibits two successive antiferromagnetic transitions at TN1 =36 K and TN2 =33 K. An A-type antiferromagnetic structure with the propagation vector q = (0 0 1 2), appears below TN1. We found a remarkable change in the moment direction at TN2, namely, the Np moment is parallel to the c axis for TN2 <T< TN1 (AF1), but parallel to the 1 1 0 direction in the basal plane for T< TN2 (AF2). The magnitude of the magnetic moment also exhibits a remarkable and discontinuous change at TN2, indicating the moment reorientation is associated with a change of the 5f electronic state. This electronic transition might be the consequence of the competition between the magnetic and/or quadrupolar interaction in the low-moment (AF1) and high-moment (AF2) states. The observed magnetic form factor indicates a dominant contribution from the orbital moment, with a small reduction from the Np3+ free ion state.

本文言語英語
論文番号144412
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
74
14
DOI
出版ステータス出版済み - 2006
外部発表はい

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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