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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