Thermal/Electronic Transport Properties and Two-Phase Mixtures in La5/8-xPrxCa3/8MnO3
K. H. Kim, M. Uehara, C. Hess, P. A. Sharma, S-W. Cheong
Abstract
We measured thermal conductivity, k, thermoelectric power, S, and dc electric conductivity, sigma, of La5/8-xPrxCa3/8MnO3, showing an intricate interplay between metallic ferromagnetism (FM) and charge ordering (CO) instability. The change of k, S and sigma with temperature (T) and x agrees well with the effective medium theories for binary metal-insulator mixtures. This agreement clearly demonstrates that with the variation of T as well as x, the relative volumes of FM and CO phases drastically change and percolative metal-insulator transition occurs in the mixture of FM and CO domains.
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