Reentrant spin-glass transition in a dilute magnet.
We perform a large-scale Monte Carlo simulation of a dilute classical Heisenberg model with ferromagnetic nearest neighbor and antiferromagnetic next-nearest neighbor interactions. We found that the model reproduces a reentrant spin-glass transition. That is, as the temperature is decreased, the magnetization increases rapidly below a certain temperature, reaches a maximum value, and then disappears at some lower temperature. The low temperature phase was suggested to be a spin-glass phase that is characterized by ferromagnetic clusters.
Abiko
S
S
Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan.
Niidera
S
S
Matsubara
F
F