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Article
Low temperature heat capacity of Fe1−xGax alloys with large magnetostriction
Physical Review B
  • J. M. Hill, Iowa State University
  • Robert J. McQueeney, Iowa State University
  • Ruqian Wu, University of California, Irvine
  • Kevin W. Dennis, Iowa State University
  • R. William McCallum, Iowa State University
  • Mianliang Huang, Iowa State University
  • Thomas A. Lograsso, Iowa State University
Document Type
Article
Publication Date
1-22-2009
DOI
10.1103/PhysRevB.77.014430
Abstract

The low temperature heat capacity Cp of Fe1−xGax alloys with large magnetostriction has been investigated. The data were analyzed in the standard way using electron (γT) and phonon (βT3) contributions. The Debye temperature ΘD decreases approximately linearly with increasing Ga concentration, consistent with previous resonant ultrasound measurements and measured phonon dispersion curves. Calculations of ΘD from lattice dynamical models and from measured elastic constants C11,C12, and C44 are in agreement with the measured data. The linear coefficient of electronic specific heat γ remains relatively constant as the Ga concentration increases, despite the fact that the magnetoelastic coupling increases. Band structure calculations show that this is due to the compensation of majority and minority spin states at the Fermi level.

Comments

This article is from Physical Review B 77 (2008): 014430, doi:10.1103/PhysRevB.77.014430.

Copyright Owner
American Physical Society
Language
en
Date Available
2013-09-23
File Format
application/pdf
Citation Information
J. M. Hill, Robert J. McQueeney, Ruqian Wu, Kevin W. Dennis, et al.. "Low temperature heat capacity of Fe1−xGax alloys with large magnetostriction" Physical Review B Vol. 77 Iss. 1 (2009) p. 014430
Available at: http://works.bepress.com/thomas_lograsso/61/