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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, and N.-C. Yeh
Phys. Rev. B 59, R697(R) – Published 1 January 1999
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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 wave numbers (209000cm1). The optical conductivity gradually changes from a Drude-like behavior to a broad peak feature near 5000cm1 in the ferromagnetic state below the Curie temperature TC=307K. 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.

  • Received 30 September 1998

DOI:https://doi.org/10.1103/PhysRevB.59.R697

©1999 American Physical Society

Authors & Affiliations

A. V. Boris, N. N. Kovaleva, and A. V. Bazhenov

  • Institute of Solid State Physics, Chernogolovka, Moscow district, 142432, Russia

P. J. M. van Bentum and Th. Rasing

  • Research Institute for Materials and High Field Magnet Laboratory, University of Nijmegen, 6525 ED Nijmegen, The Netherlands

S-W. Cheong

  • Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974
  • Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855

A. V. Samoilov and N.-C. Yeh

  • Department of Physics, California Institute of Technology, Pasadena, California 91125

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Issue

Vol. 59, Iss. 2 — 1 January 1999

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