Polaron transport and lattice dynamics in colossal-magnetoresistance manganites

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.12454· OSTI ID:496761

Lee, J D; Min, B I ^[1]

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1. Department of Physics, Pohang University of Science and Technology, Pohang 790-784 (Korea)

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{sub 1{minus}x}A{sub x}MnO{sub 3}. First, effects of both the double exchange and the electron-phonon interaction on the transport properties are investigated. We have evaluated the temperature-dependent resistance and the magnetoresistance using the Kubo formula, and examined the crossover from the 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 a reduction of the phonon damping take place with decreasing the temperature. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 496761
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CALCIUM OXIDES
ELECTRON-PHONON COUPLING
EXCHANGE INTERACTIONS
KUBO FORMULA
LATTICE VIBRATIONS
LEAD COMPOUNDS
MAGNETIC MATERIALS
MAGNETORESISTANCE
MANGANESE COMPOUNDS
POLARONS
RARE EARTH COMPOUNDS
RENORMALIZATION
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
TUNNEL EFFECT