Effects of phonon hardening on the polaron transport in colossal magnetoresistive manganites

Article

关键词: LATTICE-DYNAMICS;    LA1-XSRXMNO3;    PEROVSKITE;    CHARGE;    FILMS;    LA1-XCAXMNO3;    RESISTIVITY;   

DOI  :  10.1103/PhysRevB.61.84

来源: SCIE

【 摘 要 】

It is well established that transport properties of colossal magnetoresistive manganites can be qualitatively explained by the small polaron model incorporating the double-exchange interaction. We have improved this model by taking into account effects of phonon frequency hardening below T-c. It is found that the effects are significant in that the resistivity drop for T < T-c becomes much steeper and the magnetoresistance is enhanced substantially at T-c in accord with experiments. This model is applied to understand the evolution of T-c with the chemical pressure in R(0.7)A(0.3)MnO(3) series.

【 授权许可】

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