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arXiv · 2412.17662

Ising model in the R\'{e}nyi statistics: the finite size effects

V. V. Ignatyuk·A. P. Moina
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Abstract

The R\'{e}nyi statistics is applied for a description of finite size effects in the 1D Ising model. We calculate the internal energy of the spin chain and the system temperature using the R\'{e}nyi distribution and postulate them to be equal to their counterparts, obtained in the microcanonical ensemble. It allows us to self-consistently derive the R\'{e}nyi $q$-index and the Lagrange parameter $T$ to relate them to the physically observed system temperature $T_{\rm ph}$, and to show that the entropic phase transitions are possible in a broad temperature domain. We have also studied the temperature dependence of the internal energy $U(T_{\rm ph})$ at constant $q$ and an influence of the size related effects on the system thermodynamics.

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V. V. Ignatyuk, A. P. Moina. 2024-12-23. Ising model in the R\'{e}nyi statistics: the finite size effects. https://doi.org/10.5488/cmp.27.43603

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