Universal charge transport of the Mn oxides in the high temperature limit

Details Universal charge transport of the Mn oxides in the high temperature limit Universal charge transport of the Mn oxides in the high temperature limit

2004-02-02

arxiv.org/abs/cond-mat/0402032v1

Physics

Condensed Matter

Materials Science

4 pages, 4 eps figures, to be published in J. Appl. Phys

Scientific paper

10.1063/1.1687532

We have found that various Mn oxides have the universal resistivity and thermopower in the high temperature limit. The resistivities and thermopowers of all the samples go toward constant values of 7$\pm$1 m$\Omega$cm and $-79\pm$3 $\mu$V/K, which are independent of carrier density and crystal structures. We propose that the electric conduction occurs in a highly localized way in the high temperature limit, where the exchange of entropy and charge occurs in the neighboring Mn$^{3+}$ and Mn$^{4+}$ ions.

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