Optical conductivity of manganites: Crossover from Jahn-Teller small polaron to coherent transport in the ferromagnetic state

Article

关键词: COLOSSAL-MAGNETORESISTANCE;    DOUBLE-EXCHANGE;    ELECTRONIC-STRUCTURE;    THIN-FILMS;    LA1-XSRXMNO3;    TRANSITION;    LA1-XCAXMNO3;    LOCALIZATION;    RESISTIVITY;    SPECTRA;   

DOI  :  10.1103/PhysRevB.58.16093

来源: SCIE

【 摘 要 】

We report on the optical properties of the hole-doped manganites Nd0.7Sr0.3MnO3, La0.7Ca0.3MnO3, and La0.7Sr0.3MnO3. The low-energy optical conductivity in the paramagnetic-insulating state of these materials is characterized by a broad maximum near 1 eV. This feature shifts to lower energy and grows in optical oscillator strength as the temperature is lowered into the ferromagnetic state. It remains identifiable well below T-c and transforms eventually into a Drude-like response. This optical behavior and the activated transport in the paramagnetic state of these materials are consistent with a Jahn-Teller small polaron. The optical spectra and oscillator strength changes compare well with models that include both double exchange and the dynamic Jahn-Teller effect in the description of the electronic structure. [S0163-1829(98)06848-9].

【 授权许可】

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