Classical ferromagnet with double-exchange interaction: High-resolution Monte Carlo simulations

A high-resolution Monte Carlo study has been carried out for a classical ferromagnet on the simple cubic lattice with double-exchange interaction. The static critical exponents were determined as v = 0.6949(38), beta = 0.3535(30), and gamma = 1.3909(30). Comparison of these values, as well as the value of the fourth-order; cumulant at the transition temperature, with those for the classical Heisenberg model leads to the conclusion that these systems belong to the same universality class. Some comparisons with experiment are presented.