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First Order Temperature Corrections to the Frequency Moments of the Spectral Function of Anisotropic Heisenberg Spin Systems
[Technical Report, Research Report]
FRANKFORD ARSENAL PHILADELPHIA PA
Pagination or Media Count:
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.
[A, Approved For Public Release]