High-Temperature Expansion of the Spin-½ XY Model
- 1 January 1971
- journal article
- research article
- Published by AIP Publishing in Journal of Mathematical Physics
- Vol. 12 (1) , 61-69
- https://doi.org/10.1063/1.1665488
Abstract
The high‐temperature expansion of the spin‐½ XY model is shown to be particularly simple when the Hamiltonian is written in the second‐quantization form. By aid of a few simple rules, the partition function and susceptibility are easily evaluated to high orders.Keywords
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