Phys. Rev. B 70, 024427 (2004) [5 pages]First-principles calculation of the intersublattice exchange interactions and Curie temperatures of the full Heusler alloys Ni2MnX (X=Ga,In,Sn,Sb)Received 23 January 2004; revised 29 March 2004; published 30 July 2004 The interatomic exchange interactions and Curie temperatures in Ni-based full Heusler alloys Ni2MnX with X=Ga,In,Sn, and Sb are studied within the framework of the density-functional theory. The calculation of the exchange parameters is based on the frozen-magnon approach. Despite closeness of the experimental Curie temperatures for all four systems, their magnetism appeared to differ strongly. This difference involves both the Mn-Mn and Mn-Ni exchange interactions. The Curie temperatures, TC, are calculated within the mean-field approximation by solving a matrix equation for a multisublattice system. Good agreement with experiment for all four systems is obtained. The role of different exchange interactions in the formation of TC of the systems is discussed. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.024427
DOI:
10.1103/PhysRevB.70.024427
PACS:
75.50.Cc, 75.30.Et, 71.15.Mb
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