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Perturbation Theory for a Spin System

✍ Scribed by S. Trimper

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
343 KB
Volume
55
Category
Article
ISSN
0370-1972

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✦ Synopsis

Abstract

The spin 1/2 Heisenberg ferromagnet is treated by perturbation theory. To avoid the difficulties connected with the unusual commutation relations of spin operators the Dyson‐Maleev transformation is applied. The corresponding Bose system is described by the Bose‐Green function. To calculate the thermodynamic behaviour of the spin system a relation has been found between spin and Bose‐Green function. The low temperature expansion of the magnetization is calculated. No agreement is found using Dyson's standard result.

πŸ“œ SIMILAR VOLUMES

Finite perturbation theory for nuclear s
Finite perturbation theory for nuclear spin coupling constants
✍ J.A. Pople; J.W. McIver Jr.; N.S. Ostlund πŸ“‚ Article πŸ“… 1967 πŸ› Elsevier Science 🌐 English βš– 214 KB

Nuclear spin coupling constants are calculated using approximate SCF wavehmctions and a finite perturbation method. The results reproduce many of the experimental features and trends of coupIing constants for carbon and hydrogen. We are developing a simple theoretical method