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Journal of Mathematical Physics

High-Temperature Expansion of the Spin-½ XY Model

M. Howard Lee

Published Jan 1, 1971• 14 citations
Publisher

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.
DOI
10.1063/1.1665488

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