Infrared studies of a La0.67Ca0.33MnO3 single crystal: Optical magnetoconductivity in a half-metallic ferromagnet
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چکیده
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 wave numbers (20– 9000 cm). The optical conductivity gradually changes from a Drude-like behavior to a broad peak feature near 5000 cm in the ferromagnetic state below the Curie temperature TC5307 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 . @S0163-1829~99!50602-4#
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تاریخ انتشار 1998