Infrared Studies of a La0.67Ca0.33MnO3 Single Crystal: Optical Magnetoconductivity in a Half-Metallic Ferromagnet
A. V. Boris, N. N. Kovaleva, A. V. Bazhenov, P. J. M. van Bentum, Th. Rasing, S-W. Cheong, A. V. Samoilov, N. -C. Yeh
Abstract
The infrared reflectivity of a La0.67Ca0.33MnO3 single crystal is studied over a broad range of temperatures (78-340 K), magnetic fields (0-16 T), and wavenumbers (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 TC=307 K. Various features of the optical conductivity bear striking resemblance to recent theoretical predictions based on the interplay between the double exchange interaction and the Jahn-Teller electron-phonon coupling. A large optical magnetoconductivity is observed near TC.
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