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Quantum thermodynamics of easy-plane ferromagnetic chains

Alessandro Cuccoli, Valerio Tognetti, Paola Verrucchi, and Ruggero Vaia
Phys. Rev. B 44, 903(R) – Published 1 July 1991
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Abstract

A classical effective Hamiltonian for the quantum easy-plane ferromagnetic chain with an in-plane applied field is introduced by means of a path-integral variational method. It then becomes possible to include quantum effects of the out-of-plane fluctuations in an easily evaluable phase-space integral which approximates the quantum partition function. A comparison with experimental data for the excess specific heat of CsNiF3 shows much improvement in the description of this system. In addition, new light is shed on the old problem of defining the classical counterpart of a spin Hamiltonian.

  • Received 25 March 1991

DOI:https://doi.org/10.1103/PhysRevB.44.903

©1991 American Physical Society

Authors & Affiliations

Alessandro Cuccoli, Valerio Tognetti, and Paola Verrucchi

  • Dipartimento di Fisica, Università di Firenze, Firenze, Italy

Ruggero Vaia

  • Istituto di Elettronica Quantistica, Consiglio Nazionale delle Ricerche, Firenze, Italy

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Issue

Vol. 44, Iss. 2 — 1 July 1991

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