Lattice effects in the colossal-magnetoresistance manganites

被引:698
作者
Roder, H
Zang, J
Bishop, AR
机构
[1] LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES, LOS ALAMOS, NM 87545 USA
[2] UNIV BAYREUTH, LEHRSTUHL THEORET PHYS 1, D-95440 BAYREUTH, GERMANY
关键词
D O I
10.1103/PhysRevLett.76.1356
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study the combined influence of spin double exchange and Jahn-Teller lattice coupling to holes in the La(1-x)A(x)MnO(3) perovskites (A = Ca, Sr, Ba). Using a mean-field approximation for the double exchange and a variational Lang-Firsov approximation for the lattice degrees of freedom, we show that the lattice effects decrease the magnetic transition temperature, and also cause the maximal value of the transition temperature as a function of dopant concentration x to depend on the Jahn-Teller coupling strength. We find a continuous rapid crossover from a large polaronic state to a quasi-self-trapped small polaron state accompanying the magnetic transition.
引用
收藏
页码:1356 / 1359
页数:4
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