Polaron transport and lattice dynamics in colossal magnetoresistance manganites

Abstract

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.

7 pages, 3 Postscript figures. To appear in Phys. Rev. B (01May97)

References in corpus (4)

• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Dynamic Jahn-Teller Effect and Colossal Magnetoresistance in $L{a}_{1-x}{A}_{x}Mn{O}_3$
• Transport Properties of the Kondo Lattice Model in the Limit $S=\infty$ and $D=\infty$
• On the Fermi Liquid to Polaron Crossover II: Double Exchange and the Physics of "Colossal" Magnetoresistance

Cited by in corpus (6)

• Low-temperature electrical transport and double exchange in La(Pb,Ca)MnO
• Polaronic excitations in CMR manganite films
• Optical properties and carrier localization in the layered phosphide EuCd${}_2$P${}_2$
• Spin-orbital Jahn-Teller bipolarons
• Infrared absorption study of charge ordered $La{}_{0.5}Ca{}_{0.5-x}S{r}_{x}Mn{O}_3$ $(0.1\le x\le 0.5$
• Role of the superexchange interaction in magnetic transition and polaron crossover