Infrared studies of a La0.67Ca0.33MnO3 single crystal: Optical magnetoconductivity in a half-metallic ferromagnet

Authors
Boris, AV Kovaleva, NN Bazhenov, AV van Bentum, PJM Rasing, T Cheong, SW Samoilov, AV Yeh, NC
Citation
Av. Boris et al., Infrared studies of a La0.67Ca0.33MnO3 single crystal: Optical magnetoconductivity in a half-metallic ferromagnet, PHYS REV B, 59(2), 1999, pp. R697-R700
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
01631829 → ACNP
Volume
59
Issue
2
Year of publication
1999
Pages
R697 - R700
Database
ISI
SICI code
0163-1829(19990101)59:2<R697:ISOALS>2.0.ZU;2-Z
Abstract
The infrared reflectivity of a La0.67Ca0.33MnO3 single crystal is studied o ver a broad range of temperatures (78-340 K), magnetic fields (0-16 T), and wave numbers (20-9000 cm(-1)). The optical conductivity gradually changes from a Drude-like behavior to a broad peak feature near 5000 cm(-1) in the ferromagnetic state below the Curie temperature T-C= 307 K. Various feature s of the optical conductivity bear striking resemblance to recent theoretic al predictions based on the interplay between the double exchange interacti on and the Jahn-Teller electron-phonon coupling. A large optical magnetocon ductivity is observed near T-C. [S0163-1829(99)50602-4].