Understanding the trend in the Curie temperatures of Co{sub 2}-based Heusler compounds: Ab initio calculations
- Institut fuer Festkoerperphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt (Germany)
The Curie temperatures for the Heusler compounds Co{sub 2}TiAl, Co{sub 2}VGa, Co{sub 2}VSn, Co{sub 2}CrGa, Co{sub 2}CrAl, Co{sub 2}MnAl, Co{sub 2}MnSn, Co{sub 2}MnSi, and Co{sub 2}FeSi are determined ab initio from the electronic structure obtained with the local-density functional approximation and/or the generalized gradient approximation. Frozen spin spirals are used to model the excited states needed to evaluate the spherical approximation for the Curie temperature. The spherical approximation is found to describe the experimental Curie temperatures very well which, for the compounds selected, extend over the range from 95 to 1100 K; as a function of the valence electron count, they show an approximately linear trend which finds an explanation by our calculations.
- OSTI ID:
- 20946386
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 2; Other Information: DOI: 10.1103/PhysRevB.76.024414; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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