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Article
Physical properties of Heusler-like Fe2VAl
Physical Review B
  • Ye Feng, Iowa State University
  • J. Y. Rhee, Iowa State University
  • T. A. Wiener, Iowa State University
  • David W. Lynch, Iowa State University
  • B. E. Hubbard, Cornell University
  • A. J. Sievers, Cornell University
  • Deborah L. Schlagel, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • L. L. Miller, Iowa State University
Document Type
Article
Publication Date
4-4-2001
DOI
10.1103/PhysRevB.63.165109
Abstract

A comprehensive characterization of the compound Fe2VAl was carried out. Samples grown by arc melting or the Bridgman method have Al and Fe deficiencies of up to 5 at. %. Czochralski-grown samples were Fe rich and Al deficient. X-ray diffraction implies appreciable antisite disorder in all of our samples. Fourier-transform infrared (FTIR) spectroscopy measurements showed that the carrier density and scattering time had little sample-to-sample variation or temperature dependence for near-stoichiometric samples. FTIR and dc resistivity suggest that the transport properties of Fe2VAl are influenced by both localized and delocalized carriers, with the former primarily responsible for the negative temperature coefficient of resistivity. Magnetization measurements reveal that near-stoichiometric samples have superparamagnetic clusters with at least two sizes of moments. We conclude that in Fe2VAl, antisite disorder causes significant modification to the semimetallic band structure proposed theoretically. With antisite disorder considered, we are now able to explain most of the physical properties of Fe2VAl. None of our data suggest heavy-fermion behavior in our samples.

Comments

This article is from Physical Review B 63 (2001): 165109, doi:10.1103/PhysRevB.63.165109.

Copyright Owner
American Physical Society
Language
en
Date Available
2013-09-23
File Format
application/pdf
Citation Information
Ye Feng, J. Y. Rhee, T. A. Wiener, David W. Lynch, et al.. "Physical properties of Heusler-like Fe2VAl" Physical Review B Vol. 63 Iss. 16 (2001) p. 165109
Available at: http://works.bepress.com/d_l_schlagel/29/