Thermopower of single-crystal Nd{sub 1{minus}{ital x}}(Sr,Pb){sub {ital x}}MnO{sub 3{minus}{delta}}
- Department of Physics, University of California at Berkeley, Berkeley, California 94720 (United States)
We report measurements of the thermopower of the single-crystal manganite perovskite Nd{sub 1{minus}{ital x}}(Sr,Pb){sub {ital x}}MnO{sub 3{minus}{delta}} from 4.2 to 350 K at zero and finite magnetic field. The sign and magnitude of the thermopower above the magnetic transition are doping dependent. The magnitude of the thermopower drops sharply below the transition to the magnetically ordered state. At lower temperatures the thermopower changes sign from negative to positive with decreasing temperature in the range 100{endash}150 K. Implications for the temperature-dependent electronic structure and scattering processes in this temperature range are discussed. The high-temperature behavior is interpreted within a lattice polaron model. Further analysis suggests a form of variable-range hopping conduction at high temperatures. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 284386
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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