Effect on the Curie Temperature of Inclusion of Correlation for the Smallest Three-Spin Cluster in the S=1/2, fcc, Heisenberg Ferromagnet

Effect on the Curie Temperature of Inclusion of Correlation for the Smallest Three-Spin Cluster in the S=1/2, fcc, Heisenberg Ferromagnet

An alternative form of the 'self-consistent cluster-variation' theory is presented. The effect of including the smallest three-spin cluster is discussed with regard to the Curie temperature for the spin-1/2 fcc ferromagnetic insulator in the Heisenberg model. It is found that for range of...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: Libelo, Louis F
Format: Report
Sprache:eng
Schlagworte:
CORRELATION TECHNIQUES
CRYSTAL LATTICES
CURIE TEMPERATURE
Electricity and Magnetism
ELECTRON SPIN
FACE CENTERED CUBIC LATTICES
FERROMAGNETISM
HEISENBERG FERROMAGNETS
INTERACTIONS
MAGNETIC MOMENTS
MAGNETIC ORDERING
MATHEMATICAL MODELS
PHASE STUDIES
Solid State Physics
TRANSITION TEMPERATURE
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Zusammenfassung:An alternative form of the 'self-consistent cluster-variation' theory is presented. The effect of including the smallest three-spin cluster is discussed with regard to the Curie temperature for the spin-1/2 fcc ferromagnetic insulator in the Heisenberg model. It is found that for range of exchange to first neighbors no long range ordering temperature exists in this approximation. (Author)