Coexistence of localized and itinerant carriers near Tc in calcium-doped manganites

Details Coexistence of localized and itinerant carriers near Tc in calcium-doped manganites Coexistence of localized and itinerant carriers near Tc in calcium-doped manganites

1998-08-14

arxiv.org/abs/cond-mat/9808160v2

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex, 11 pages, 4 figures. Revised version submitted to PRB, 01/99

Scientific paper

10.1103/PhysRevB.60.1028

We explore the possibility that polaronic distortions in the paramagnetic phase of La$_{0.67}$Ca$_{0.33}$MnO$_3$ manganites persist in the ferromagnetic phase by considering the observed electrical resistivity to arise from coexisting field- and temperature-dependent polaronic and band-electron fractions. We use an effective medium approach to compute the total resistivity of the two-component system, and find that a limit with low percolation threshold explains the data rather well. To test the validity of this model, we apply it to the thermoelectric coefficient. We propose a plausible mean-field model that reproduces the essential features of a microscopic model and provides a comparison with the experimental mixing fraction, as well as the magnetization and magnetic susceptibility.

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