Accession Number:

AD0777766

Title:

First Order Temperature Corrections to the Frequency Moments of the Spectral Function of Anisotropic Heisenberg Spin Systems

Descriptive Note:

[Technical Report, Research Report]

Corporate Author:

FRANKFORD ARSENAL PHILADELPHIA PA

Personal Author(s):

• Malinoski, Frederick A.

Report Date:

1973-06-01

Pagination or Media Count:

39

Abstract:

The first-order temperature corrections to the zeroth and second, longitudinal and transverse, wave-vector-dependent frequency moments are calculated for a Heisenberg spin system with uniaxial and exchange anisotropy and with an arbitrary interaction range. These moments are applied to several lattices, including the hexagonal close-packed structure of terbium, which possesses a large uniaxial anisotropy constant. The calculated energy transfer of magnetically scattered neutrons is shown to be in good agreement with experimental data for terbium and also gives evidence of a significant short-range-order effect.

Descriptors:

• cubic lattices
• crystal structure
• energy transfer
• neutron scattering
• experimental data
• scattering
• high temperature
• energy
• equations
• transverse
• crystal lattices
• couplings
• engineering
• low temperature
• quantum properties
• abstracts
• agreements
• anisotropy
• commerce
• critical temperature

Subject Categories:

• Solid State Physics

Distribution Statement:

[A, Approved For Public Release]