Accession Number : AD0875746

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

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Libelo, Louis F.

Report Date : 01 SEP 1970

Pagination or Media Count : 20

Abstract : 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)

Descriptors :   (*FERROMAGNETISM, MATHEMATICAL MODELS), (*MAGNETIC MOMENTS, INTERACTIONS), PHASE STUDIES, TRANSITION TEMPERATURE, CRYSTAL LATTICES, CORRELATION TECHNIQUES.

Subject Categories : Electricity and Magnetism
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE