Charge dynamics and possibility of ferromagnetism in A1-xLaxB6 (A=Ca and Sr)

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

*この研究の対応する著者

研究成果: Article査読

21 被引用数 (Scopus)

抄録

Ferromagnetism was recently reported in La-doped alkaline-earth hexaborides A1-xLaxB6 (A = Ca, Sr, and Ba). We have performed reflectivity, Hall resistivity, and magnetization measurements of A1-xLaxB6. The results indicate that A1-xLaxB6 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 (∼ 10 μm 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 A1-xLaxB6 reported so far is not intrinsic.

本文言語English
論文番号064407
ページ(範囲)644071-644077
ページ数7
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
66
6
出版ステータスPublished - 2002 8 1
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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