https://doi.org/10.1140/epjb/s10051-025-01002-4
Research - Condensed Matter
A phenomenological theory for the double-peak structure in the specific heat of CeRu
Si
Hokkaido University of Education, Asahikawa, Hokumon-cho 9, 070-8621, Asahikawa, Hokkaido, Japan
Received:
24
April
2025
Accepted:
10
July
2025
Published online:
21
July
2025
The double-peak structure observed in the specific heat of CeRuSi is explained by a phenomenological theory with free energy density expansion by entropy deviation within the first and third order. We minimize this free energy density with respect to the entropy deviation and obtain the specific heat of CeRuSi. The critical behavior of the specific heat as a function of the external magnetic field is also obtained within this theory. However, since this critical behavior would be an artifact of the mean-field theory, this criticality should be weakened in a desirable theory. Compared with an experiment, the temperature dependence of the peak value of the specific heat is also determined.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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.
