The small polaron crossover transition in colossal magnetoresistance (CMR) manganites
Abstract
Based on the combined model of the double exchange and the polaron, we have studied the small-to-large polaron crossover transition and explored its effects on the magnetic and transport properties in colossal magnetoresistance (CMR) manganites. We have used the variational Lang-Firsov canonical transformation, and shown that the magnetic and transport properties of both high and low TC manganites are well described in terms of a single formalism. We have reproduced the rapid resistivity drop below TC, a realistic CMR ratio, and the first-order-like sharp magnetic phase transition, which are observed in low TC manganites.
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