Accession Number:

AD0775689

Title:

A Three-Parameter Gram-Charlier Gaussian Representation of the Spectral Function of Spin Correlations,

Descriptive Note:

Corporate Author:

FRANKFORD ARSENAL PHILADELPHIA PA

Personal Author(s):

Report Date:

1973-06-01

Pagination or Media Count:

16.0

Abstract:

A possible three-parameter Gram-Charlier form of the Gaussian diffusivity representation of the magnetic spin spectral function is evaluated for a restricted XY Heisenberg model, a linear chain of S 12 spins with only transverse exchange at elevated temperature. A brief analytical background is presented for the method of wave-vector-dependent frequency moments, which are used to determine the approximate spectral function. The three-parameter form of the spectral function is compared with a previous corresponding two-parameter form and with an exact solution available for the restricted XY model. It is concluded that the postulated three-parameter Gram-Charlier Gaussian diffusivity, utilizing the additional information in the sixth frequency moment, offers a definite improvement in the representation of spin spectral functions and correlations. Author

Subject Categories:

  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE