Lattice effects in the colossal-magnetoresistance manganites
- Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
We study the combined influence of spin double exchange and Jahn-Teller lattice coupling to holes in the La{sub 1{minus}{ital x}}{ital A}{sub {ital x}}MnO{sub 3} perovskites ({ital 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 {ital 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. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 284537
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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