2013/08/31 by S. A. Owerre, Solomon Akaraka Owerre, M. B. Paranjape +1
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum many-body systems #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.1142/s0217979214500088
published as Int. J. Mod. Phys. B 28, 1450008 (2013) · 7 pages, 3 figures
arxiv created 2013/09/09 · openalex publication_date 2013/11/15 · arxiv updated 2013/11/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The Hamiltonian of a two-sublattice antiferromagnetic spins, with single (hard-axis) and double ion anisotropies described by [Formula: see text] is investigated using the method of effective potential. The problem is mapped to a single particle quantum-mechanical Hamiltonian in terms of the relative coordinate and reduced mass. We study the quantum-classical phase transition of the escape rate of this model. We show that the first-order phase transition for this model sets in at the critical value J c = (K c +J z, c )/2 while for the anisotropic Heisenberg coupling [Formula: see text] we obtain J c = (2K c -J z, c )/3. The phase diagrams of the transition are also studied.