Critical Phenomena of Ferromagnetic Transition in Double-Exchange Systems

Details Critical Phenomena of Ferromagnetic Transition in Double-Exchange Systems Critical Phenomena of Ferromagnetic Transition in Double-Exchange Systems

2001-03-10

arxiv.org/abs/cond-mat/0103230v1

J. Phys. Soc. Jpn. 70, 1487 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages including 1 table and 5 figures, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.70.1487

Critical phenomena of ferromagnetic transition at finite temperatures are studied in double-exchange systems. In order to investigate strong interplay between charge and spin degrees of freedom, Monte Carlo technique is applied to include fluctuations in a controlled and unbiased manner. By using finite-size scaling analysis, critical exponents and transition temperature are estimated for a model with Ising spin symmetry in two dimensions. The obtained exponents are far distinct from the mean-field values, but consistent with those of spin models with short-range exchange interactions. The universality class of this transition belongs to that of short-range interaction with the same spin symmetry. We also discuss the case for three dimensions. The results are compared with experimental results in perovskite manganites which show colossal magnetoresistance.

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