Ferromagnetism in Fe-doped Ba6Ge25 chiral clathrate

被引：22
|
作者：
Li, Y [1 ]
Ross, JH [1 ]
机构：
[1] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA
来源：
APPLIED PHYSICS LETTERS | 2003年 / 83卷 / 14期
关键词：
D O I：
10.1063/1.1616658
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have synthesized a Ba6Ge25 clathrate, substituting 3 Ge per formula unit by Fe. This chiral clathrate has Ge sites forming a framework of closed cages and helical tunnel networks. Fe atoms randomly occupy these sites, and exhibit high-spin magnetic moments. A ferromagnetic transition is observed with T-c=170 K, the highest observed T-c for a magnetic clathrate. However, the magnetic phase is significantly disordered, and exhibits a transformation to a reentrant spin glass phase. This system has a number of features in common with other dilute magnetic semiconductors. (C) 2003 American Institute of Physics.
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页码：2868 / 2870
页数：3
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