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,

Descriptive Note:

Corporate Author:

NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s):

• Libelo, Louis F.

Report Date:

1970-09-01

Pagination or Media Count:

20.0

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-12 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