Accession Number : AD0692977

Title :   SOME CRITICAL PROPERTIES OF QUANTUM-MECHANICAL HEISENBERG FERRO- AND ANTIFERROMAGNETS.

Descriptive Note : Meeting speech,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Stanley,Harry E.

Report Date : 1969

Pagination or Media Count : 4

Abstract : High-temperature expansions of the staggered susceptibility for the Heisenberg antiferromagnet are analyzed for two-dimensional lattices. The evidence favoring a divergent staggered susceptibility is found to be essentially as strong as that presented earlier in support of a divergent susceptibility for the two-dimensional Heisenberg ferromagnet. Thus the very recent experimental and theoretical findings which favor a phase transition in various 'planar antiferromagnets' (or materials with the K2NiF4 structure in which the intraplanar interactions may be as much as 100,000 times stronger than any interplanar interactions) would appear to be supported by the series expansions. (Author)

Descriptors :   (*ANTIFERROMAGNETISM, MATHEMATICAL MODELS), (*MAGNETIC MOMENTS, INTERACTIONS), QUANTUM THEORY, MAGNETIC PROPERTIES, CRYSTAL STRUCTURE

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE