Surface magnetism: phase transitions in quantum and classical models

We study the phase diagram and multicritical behavior of the semi-infinite quantum spin 1/2 anisotropic Heisenberg and classical O(n) models. We use correlated effective field theory. The multicritical point Δc and the crossover exponent φ are obtained as a function of the value n and anisotropy parameter. We have compared the results of systems with ferromagnetic and antiferromagnetic interactions.

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Year of publication:	2003
Authors:	Cabral Neto, J. ; Sousa, J. Ricardo de
Published in:	Physica A: Statistical Mechanics and its Applications. - Elsevier, ISSN 0378-4371. - Vol. 319.2003, C, p. 319-330
Publisher:	Elsevier
Subject:	Surface magnetism \| Heisenberg model \| Effective-field theory

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Type of publication:	Article
Source:	RePEc - Research Papers in Economics

Persistent link: https://www.econbiz.de/10011058042