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 Δ c and the crossover exponent φ are obtained as a function of the value n and anisotropy p...

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Bibliographic Details
Published in:Physica A 2003-03, Vol.319, p.319-330
Main Authors: Cabral Neto, J., de Sousa, J.Ricardo
Format: Article
Language:English
Subjects:
Effective-field theory
Heisenberg model
Surface magnetism
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Summary: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 Δ c 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.
ISSN:0378-4371
1873-2119
DOI:10.1016/S0378-4371(02)01520-0