The Neel point for spin-transition systems: toward a two-step transition

The spin-transition (ST) phenomenon may be described by an Ising Hamiltonian with a temperature dependent tranvserse field. This Hamiltonian is analyzed for “antiferromagnetic” or “heterophilic” coupling, both in the mean-field approximation (MFA) and with a Monte Carlo simulation (MCS). Both method...

Full description

Saved in:
Bibliographic Details
Published in:Chemical physics 1996-11, Vol.211 (1), p.101-114
Main Author: Bolvin, Hélène
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The spin-transition (ST) phenomenon may be described by an Ising Hamiltonian with a temperature dependent tranvserse field. This Hamiltonian is analyzed for “antiferromagnetic” or “heterophilic” coupling, both in the mean-field approximation (MFA) and with a Monte Carlo simulation (MCS). Both methods show that above a critical value of the coupling parameter a two-step spin transition is obtained. This two-step behavior corresponds to “antiferromagnetic” ordering. Then, a global phase diagram is proposed, valid for Ising magnetic and spin-transition systems, for both “ferromagnetic” and “antiferromagnetic” couplings.
ISSN:0301-0104
DOI:10.1016/0301-0104(96)00241-8