Charge dynamics and possibility of ferromagnetism in (formula presented) (formula presented) and Sr)

K. Taniguchi, T. Katsufuji, F. Sakai, H. Ueda, K. Kitazawa, H. Takagi

研究成果: Article査読

抄録

Ferromagnetism was recently reported in La-doped alkaline-earth hexaborides (formula presented) (formula presented) Sr, and Ba). We have performed reflectivity, Hall resistivity, and magnetization measurements of (formula presented) The results indicate that (formula presented) can be regarded as a simple doped semimetal, with no signature of an excitonic state as suggested by several theories. It is also found that the surface of as-grown samples (formula presented) in thickness) has a different electronic structure from a bulk one, and a fairly large number of paramagnetic moments are confined in this region. After eliminating these paramagnetic moments at the surface, we could not find any evidence of an intrinsic ferromagnetic moment in our samples, implying the possibility that the ferromagnetism of (formula presented) reported so far is not intrinsic.

本文言語English
ページ(範囲)1-7
ページ数7
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
66
6
DOI
出版ステータスPublished - 2002
外部発表はい

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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