Ferromagnetic phases due to competing short- and long-range interactions in the spin-5/2 and spin-2 Blume-Capel model

Publication date: Available online 6 September 2018Source: Physics Letters AAuthor(s): Octavio D. Rodriguez Salmon, Minos A. Neto, Francisco Dinóla Neto, Denis Américo Murillo Pariona, Justo Rojas TapiaAbstractWe broaden the study of the statistical physics of the spin-S Blume-Capel model with ferromagnetic mean-field interactions J in competition with short-range antiferromagnetic interactions K in a linear chain in the thermodynamic limit. This work is dedictated to the case when S takes the half-integer spin S=5/2 and when S assumes the integer value S=2. In both cases the phase diagrams exhibit new ferromagnetic phases (for certain values of K) enclosed by branches emerging from the first-order frontiers of the pure ferromagnetic model. For finite temperatures the complex topologies were obtained by numerical minimization of the free energy and some results were confirmed by Monte Carlo simulations.

Source: Physics Letters A - September 7, 2018 Category: Physics Source Type: research