Title: Random-anisotropy mixed-spin Ising on a triangular lattice
Author(s):

	E. S. de Santana (Instituto de Física, Universidade Federal de Mato Grosso, 78060-900, Cuiabá, Mato Grosso, Brazil),
	A. S. de Arruda (Instituto de Física, Universidade Federal de Mato Grosso, 78060-900, Cuiabá, Mato Grosso, Brazil),
	M. Godoy (Instituto de Física, Universidade Federal de Mato Grosso, 78060-900, Cuiabá, Mato Grosso, Brazil)

We have studied the mixed spin-1/2 and 1 Ising ferrimagnetic system with a random anisotropy on a triangular lattice with three interpenetrating sublattices A, B, and C. The spins on the sublattices are represented by σ_A (states ±1/2), σ_B (states ±1/2), and S_C (states ±1, 0). We have performed Monte Carlo simulations to obtain the phase diagram temperature k_BT/|J| versus the strength of the random anisotropy D/|J|. The phase boundary between two ferrimagnetic FR₁ and FR₂ phases at lower temperatures are always first-order for p < 0.25 and second-order phase transition between the FR₁, FR₂ and the paramagnetic P phases. On the other hand, for values of p ⪆ 0.5, the phase diagram presents only second-order phase transition lines.

Key words: random anisotropy, mixed-spin Ising system, Monte Carlo simulation

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