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Author Feng, Ye ♦ Rhee, J. Y. ♦ Wiener, T. A. ♦ Lynch, D. W. ♦ Hubbard, B. E. ♦ Sievers, A. J. ♦ Schlagel, D. L. ♦ Lograsso, T. A. ♦ Miller, L. L.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ BRIDGMAN METHOD ♦ CARRIER DENSITY ♦ MAGNETIZATION ♦ MELTING ♦ MODIFICATIONS ♦ PHYSICAL PROPERTIES ♦ SCATTERING ♦ SPECTROSCOPY ♦ TEMPERATURE COEFFICIENT ♦ TEMPERATURE DEPENDENCE ♦ TRANSPORT ♦ X-RAY DIFFRACTION
Abstract A comprehensive characterization of the compound Fe{sub 2}VAl 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 Fe{sub 2}VAl 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 Fe{sub 2}VAl, 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 Fe{sub 2}VAl. None of our data suggest heavy-fermion behavior in our samples.
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-04-15
Publisher Place United States
Journal Physical Review B
Volume Number 63
Issue Number 16


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