https://doi.org/10.1140/epjb/s10051-026-01119-0
Research - Statistical and Nonlinear Physics
Entropy of the cell fluid model with Curie–Weiss interaction
Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 79011, Lviv, Ukraine
a
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Received:
24
October
2025
Accepted:
4
January
2026
Published online:
29
January
2026
Abstract
Entropy of the cell fluid model with Curie–Weiss interaction is obtained in analytical form as a function of temperature and chemical potential. A parametric equation is derived representing the entropy as a function of density. Features of both the entropy per particle and the entropy per cell are investigated at the entropy-density and entropy-chemical potential planes. The considered cell model is a multiple-occupancy model and possesses an infinite sequence of first-order phase transitions at sufficiently low temperatures. We find that the entropy exhibits pronounced minima at around integer-valued particle densities, which may be a generic feature of multiple-occupancy models.
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O. A. Dobush, M. P. Kozlovskii, I. V. Pylyuk and M. A. Shpot contributed equally to this work.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
