Pseudogap formation in the intermetallic compounds (Fe1-xVx)(3)Al

Citation
H. Okamura et al., Pseudogap formation in the intermetallic compounds (Fe1-xVx)(3)Al, PHYS REV L, 84(16), 2000, pp. 3674-3677
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
84
Issue
16
Year of publication
2000
Pages
3674 - 3677
Database
ISI
SICI code
0031-9007(20000417)84:16<3674:PFITIC>2.0.ZU;2-4
Abstract
Optical conductivity data of the intermetallic compounds (Fe1-xVx)(3)Al (0 less than or equal to x less than or equal to 0.33) reveal that their densi ty of states around the Fermi energy (E-F) is strongly reduced as x is incr eased. In particular. Fe2VAl (x = 0.33) has a deep, well-developed pseudoga p of 0.1-0.2 eV at E-F and a small density (similar to 5 X 10(20) cm(-3)) o f carriers, which is highly unusual for intermetallic compounds. It is show n that the pseudogap results from the band structure of Fe2VAl, rather than from temperature-dependent correlation effects. Based on the present resul ts. we propose a simple model that consistently explains both the semicondu ctorlike transport and the metallic photoemission results previously observ ed for Fe-2 VAl.