Phase Transition in Heisenberg Stacked Triangular Antiferromagnets: End of a Controversy

V. Thanh Ngo (1) , Hung The Diep (2)

1 IOP - Institute of Physics, Hanoi
2 LPTM - UMR 8089 - Laboratoire de Physique Théorique et Modélisation

By using the Wang-Landau flat-histogram Monte Carlo (MC) method for very large lattice sizes never simulated before, we show that the phase transition in the frustrated Heisenberg stacked triangular antiferromagnet is of first-order, contrary to results of earlier MC simulations using old-fashioned methods. Our result lends support to the conclusion of a nonperturbative renormalization group performed on an effective Hamiltonian. It puts an end to a 20-year long controversial issue.

Mots clés: Frustrated Spin Systems; Phase transition; Monte Carlo Simulation; Wang-Landau Method

Domaines: Mécanique statistique [cond-mat.stat-mech]

V. Thanh Ngo, Hung The Diep. Phase Transition in Heisenberg Stacked Triangular Antiferromagnets: End of a Controversy. Phs. Rev. E, 2008, 78, pp.031119. ⟨10.1103/PhysRevE.78.031119⟩. ⟨hal-00308998⟩