Transport mechanisms in doped LaMnO3: Evidence for polaron formation

T. T M Palstra, A. P. Ramirez, S. W. Cheong, B. R. Zegarski, P. Schiffer, J. Zaanen

Research output: Contribution to journalArticle

Abstract

We report electrical transport experiments on the colossal magnetoresistance compound (La,Ca)MnO3 over a wide range of composition and temperature. Comparison of thermopower and electrical resistivity measurements above the metal-insulator transition indicate a transport mechanism not dominated by spin disorder, but by small polaron formation. Additionally, we find that in the high-temperature limit the thermopower corresponds to backflow of spin entropy, expected from motion of positively charged particles in a rigid S = 2 system, showing a remarkable independence of S = 3/2 particle density.

Original languageEnglish (US)
Pages (from-to)5104-5107
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number9
StatePublished - Sep 1 1997
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Palstra, T. T. M., Ramirez, A. P., Cheong, S. W., Zegarski, B. R., Schiffer, P., & Zaanen, J. (1997). Transport mechanisms in doped LaMnO3: Evidence for polaron formation. Physical Review B - Condensed Matter and Materials Physics, 56(9), 5104-5107.