Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 248, Issue 12, Pages 2870-2876Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201147020
Keywords
CuHgTi; electronic structure; half-metals; vacancies
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Funding
- Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality (IHLB) [PHR201007101]
- Development Project of Science and Technology
- Beijing Education Committee [KM200910005023]
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The first-principles calculation within density-functional theory is used to investigate the electronic structures and magnetic properties in CuHg2Ti-type alloys FeV2Z (Z=Si, Ge, As, Sb). FeV2Sb is predicted to be half-metal and the energy gap lies in the majority-spin bands. Though FeV2Si, FeV2Ge, and FeV2As show no half-metallicity, their spin polarization of conduction electrons is around 99.7, 99.0, and 97.8%, respectively. The investigation of volume distortion shows that over 99% spin-polarization can be retained in the range of 5.706.05 angstrom for FeV2Si, 5.856.05 angstrom for FeV2Ge, and 5.906.00 angstrom for FeV2As, respectively. FeV2Sb can keep half-metallicity from 6.00 to 6.15 angstrom. We studied the effects of defects at transition-metal sites and Ge, As, and vacancy substitution for Sb atom on the electronic structures in FeV2Sb, and the results indicate that half-metallicity in FeV2Sb is not sensitive to substitutions for Sb sites. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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