Competition of Zener and polaron phases in doped CMR manganites

Details Competition of Zener and polaron phases in doped CMR manganites Competition of Zener and polaron phases in doped CMR manganites

2001-01-16

arxiv.org/abs/cond-mat/0101235v1

Phys. Rev. B 64, 104413 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 5 figures

Scientific paper

10.1103/PhysRevB.64.104413

Inspired by the strong experimental evidence for the coexistence of localized and itinerant charge carriers close to the metal-insulator transition in the ferromagnetic phase of colossal magnetoresistive manganese perovskites, for a theoretical description of the CMR transition we propose a two-phase scenario with percolative characteristics between equal-density polaron and Zener band-electron states. We find that the subtle balance between these two states with distinctly different electronic properties can be readily influenced by varying physical parameters, producing various ``colossal'' effects, such as the large magnetization and conductivity changes in the vicinity of the transition temperature.

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