Journal de Physique I

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DOI: 10.1051/jp1:1994154
J. Phys. I France 4 (1994) 493-497

Short Communication

Extension of the Popov-Fedotov method to arbitrary spin

O. Veits, R. Oppermann, M. Binderberger and J. Stein

Physikalisches Institut der Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

(Received 28 January 1994, accepted 21 February 1994)

Abstract
The partition function and thermodynamic expectation values of a spin system with arbitrary spin quantum number are expressed by an exact fermionic representation on Fock space. Extending a suggestion of Popov and Fedotov, this is achieved by introducing a set of imaginary chemical potentials. Spin operators are replaced by usual bilinear combinations of Fermi operators satisfying the spin commutation relations.