Transport mechanisms in doped LaMnO{sub 3}: Evidence for polaron formation

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.5104· OSTI ID:538560

Palstra, T T ^[1]; Ramirez, A P; Cheong, S; Zegarski, B R ^[2]; Schiffer, P ^[3]; Zaanen, J ^[4]

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1. Department of Chemical Physics and Materials Science Center, State University of Groningen, 9794 AG Groningen (The Netherlands)
2. Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)
3. University of Notre Dame, Notre Dame, Indiana 46556 (United States)
4. Lorentz Institute, University of Leiden, 2300 RA Leiden (The Netherlands)

We report electrical transport experiments on the colossal magnetoresistance compound (La,Ca)MnO{sub 3} 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. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 538560
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
CHARGED-PARTICLE TRANSPORT
ELECTRIC CONDUCTIVITY
LANTHANUM OXIDES
MAGNETORESISTANCE
MANGANESE OXIDES
POLARONS