Randomness Effect on Multicritical Phenomena in Double-Exchange Systems
Yukitoshi Motome, Nobuo Furukawa, Naoto Nagaosa
Abstract
Double-exchange model interacting with adiabatic phonons is studied in the presence of randomness by using the Monte-Carlo method and the systematic size-scaling analysis. A bicritical behavior is found between the ferromagnetic metal and the charge-ordered insulator. We find the distinct response to the randomness between these two states, which agrees well with the experimental results in the colossal magnetoresistance manganites.
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