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Ferromagnetism in Fe-doped Ba6Ge25 Chiral Clathrate

Materials Science 2009-11-10 v1
Authors: Yang Li , Joseph H. Ross
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Abstract

We have successfully synthesized a Ba6Ge25 clathrate, substituting 3 Fe per formula unit by Ge. 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 Tc = 170 K, the highest observed Tc for a magnetic clathrate. However, the magnetic phase is significantly disordered, and exhibits a transformation to a re-entrant spin glass phase. This system has a number of features in common with other dilute magnetic semiconductors.

Keywords

ferromagnetism Fe-doped clathrate chiral clathrate Ba6Ge25 high-spin magnetic moments re-entrant spin glass dilute magnetic semiconductors

Cite

@article{arxiv.cond-mat/0306044,
  title  = {Ferromagnetism in Fe-doped Ba6Ge25 Chiral Clathrate},
  author = {Yang Li and Joseph H. Ross},
  journal= {arXiv preprint arXiv:cond-mat/0306044},
  year   = {2009}
}

Comments

Submitted to Applied Physics Letters. Fig. 1 resolution reduced for online archive version

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