Physics – Condensed Matter
Scientific paper
1997-04-07
Physics
Condensed Matter
7 pages, 3 Postscript figures. To appear in Phys. Rev. B (01May97)
Scientific paper
10.1103/PhysRevB.55.12454
Based on the model combining the spin double exchange and the lattice polaron, we have studied the colossal magnetoresistance phenomena observed in perovskite manganites R_{1-x}A_xMnO_3. First, effects of both the double exchange and the electron-phonon interaction on the transport property are investigated. We have evaluated the temperature dependent resistance and the magnetoresistance using the Kubo formula, and examined the crossover from tunneling to hopping regime of small polarons. Second, effects of the double exchange interaction on the lattice degree of freedom are explored. It is found that both the hardening of the phonon frequency and the reduction of the phonon damping take place with decreasing the temperature.
Lee Dominic J.
Min B. I.
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