Microscopic magnetic properties of the ferromagnetic superconductor UCoGe reviewed by x-ray magnetic circular dichroism

M. Taupin, J. P. Sanchez, J. P. Brison, D. Aoki, G. Lapertot, F. Wilhelm, A. Rogalev

研究成果: Article査読

21 被引用数 (Scopus)

抄録

The ferromagnetic superconductor UCoGe has been investigated by high field x-ray magnetic circular dichroism (XMCD) at the U M4,5 and Co/Ge K edges. The analysis of the branching ratio and XMCD at the U M4,5 edges reveals that the U 5f electrons count is close to 3. The orbital (∼0.70μB) and spin (∼-0.30μB) moments of U at 2.1 K and 17 T (H∥c) have been determined. Their ratio (∼-2.3) suggests a significant delocalization of the 5f electron states. The similar field dependences of the local U/Co and the macroscopic magnetizationindicate that the Co moment is induced by the U moment. The XMCD at the Co/Ge K edges reveal the presence of small Co 4p and Ge 4p orbital moments parallel to the macroscopic magnetization. In addition, the Co 3d moment is estimated to be at most of the order of 0.1μB at 17 T. Our results rule out the possibility of an unusual polarizability of the U and Co moments as well as their antiparallel coupling. We conclude that the magnetism which mediates the superconductivity in UCoGe is driven by U.

本文言語English
論文番号035124
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
92
3
DOI
出版ステータスPublished - 2015 7月 13

ASJC Scopus subject areas

  • 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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