Heisenberg model in a random field: phase diagram and tricritical behavior
Douglas F. de Albuquerque, A. S. de Arruda
Abstract
By using the differential operator technique and the effective field theory scheme we study the tricritical behavior of Heisenberg classical model of spin-1/2 in a random field. The phase diagram in the T-h plane on a square and simple cubic lattice for a cluster with two spins is obtained when the random field is bimodal distributed.
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