Entropy-Driven Reentrant Behavior in CMR Manganites
  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. 
Nobuo Furukawa, Yukitoshi Motome, and Naoto Nagaosa