Published 1983 | Version v1
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Criticality of the D=2 anisotropic quantum Heisenberg model

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Description

Within a real space renormalization group framework, the square-lattice spin-1/2 Heisenberg ferromagnet in the presence of an Ising-like anisotropy is discussed. The controversial point on how T sub(c) vanishes in the isotropic Heisenberg limit is analyzed: quite strong evidence is presented favoring a continuous function of anisotropy. The crossover from the isotropic Heisenberg model to the pure Ising one is exhibited. (Author)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (Portuguese)

Discute-se, dentro de uma base do grupo de renormalizacao do espaco real, o ferromagneto de Heisenberg de spin-1/2 de rede quadrada na presenca de uma anisotropia do tipo Ising. Analisa-se o ponto de controversia sobre como T sub(c) anula-se no limite de Heisenberg isotropico: apresenta-se forte evidencia favorecendo uma funcao continua de anisotropia. Exibe-se o 'crossover' do modelo de Heisenberg isotropico para o modelo de Ising puro. (L.C.)

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Additional details

Publishing Information

Imprint Pagination
11 p.
Report number
CBPF-NF--025/83

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
16025320
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
ANISOTROPY; CRITICAL TEMPERATURE; CRYSTAL LATTICES; GROUP THEORY; HEISENBERG MODEL; SPIN; THEORETICAL DATA
Descriptors DEC
ANGULAR MOMENTUM; CRYSTAL MODELS; CRYSTAL STRUCTURE; DATA; INFORMATION; MATHEMATICAL MODELS; MATHEMATICS; NUMERICAL DATA; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE