Transport mechanisms in doped LaMnO3: Evidence for polaron formation | |
Article | |
关键词: THERMOELECTRIC-POWER; MAGNETORESISTANCE; RESISTIVITY; LA1-XCAXMNO3; FILMS; SEMICONDUCTOR; LA1-XSRXMNO3; | |
DOI : 10.1103/PhysRevB.56.5104 | |
来源: SCIE |
【 摘 要 】
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.
【 授权许可】
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