2001/01/16 by A. Weisse, J. Loos, H. Fehske
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.64.104413
published as Phys. Rev. B 64, 104413 (2001) · 8 pages, 5 figures
arxiv created 2001/01/16 · arxiv updated 2009/11/30
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.