Entropy-Driven Reentrant Behavior in CMR Manganites
Nobuo Furukawa, Yukitoshi Motome, and Naoto Nagaosa
TL;DR
This paper explains the reentrant insulating behavior in CMR manganites as a result of entropy-driven effects caused by competing charge order and ferromagnetism, influenced by randomness.
Contribution
It introduces a model where entropy effects and charge order fluctuations explain the reentrant insulating states in manganites.
Findings
Reentrant insulating behavior arises above the Curie temperature.
Randomness pins charge order fluctuations, affecting resistivity.
Entropy-driven mechanisms explain temperature dependence of resistivity.
Abstract
We discuss the origin of the reentrant behaviors of insulating states above the Curie temperature of the colossal magnetoresistance manganites. We consider a system where charge ordering and ferromagnetism compete with each other. In the presence of randomness which pins charge order fluctuations, entropy-driven reentrant behaviors will appear, which explains the typical temperature dependence of the resistivity for CMR manganites.
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