Transport mechanisms in doped LaMnO3: Evidence for polaron formation

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

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Abstract

We report electrical transport experiments on the colossal magnetoresistance compound (Formula presented) 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 (Formula presented) system, showing a remarkable independence of (Formula presented) particle density.

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

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