Infrared Studies of a La_{0.67}Ca_{0.33}MnO_3 Single Crystal: Optical Magnetoconductivity in a Half-Metallic Ferromagnet

A. V. Bazhenov; A. V. Boris; A. V. Samoilov; N.-C. Yeh; N. N. Kovaleva; P. J. M. van Bentum; S-W. Cheong; Th. Rasing

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Infrared Studies of a La_{0.67}Ca_{0.33}MnO_3 Single Crystal: Optical Magnetoconductivity in a Half-Metallic Ferromagnet

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arxiv cond-mat/9808049 v1 pith:MUJJ3OGS submitted 1998-08-05 cond-mat.str-el

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 This is my paper · ORCID

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keywords opticalbroadconductivitycrystalinfraredmagnetoconductivitynearsingle

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abstract

The infrared reflectivity of a $\rm La_{0.67}Ca_{0.33}MnO_3$ 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 $T_C=307 K$. 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 $T_C$.

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