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Otto Engine for the q-State Clock Model

Department of Physics, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile
Center for the Development of Nanoscience and Nanotechnology, Santiago 8320000, Chile
Author to whom correspondence should be addressed.
Academic Editors: T M Indra Mahlia and Rinaldi Idroes
Entropy 2022, 24(2), 268;
Received: 22 January 2022 / Revised: 10 February 2022 / Accepted: 11 February 2022 / Published: 13 February 2022
(This article belongs to the Special Issue Thermal Analysis of Materials)
This present work explores the performance of a thermal–magnetic engine of Otto type, considering as a working substance an effective interacting spin model corresponding to the q state clock model. We obtain all the thermodynamic quantities for the q = 2, 4, 6, and 8 cases in a small lattice size (3×3 with free boundary conditions) by using the exact partition function calculated from the energies of all the accessible microstates of the system. The extension to bigger lattices was performed using the mean-field approximation. Our results indicate that the total work extraction of the cycle is highest for the q=4 case, while the performance for the Ising model (q=2) is the lowest of all cases studied. These results are strongly linked with the phase diagram of the working substance and the location of the cycle in the different magnetic phases present, where we find that the transition from a ferromagnetic to a paramagnetic phase extracts more work than one of the Berezinskii–Kosterlitz–Thouless to paramagnetic type. Additionally, as the size of the lattice increases, the extraction work is lower than smaller lattices for all values of q presented in this study. View Full-Text
Keywords: q-state clock model; entropy; Berezinskii–Kosterlitz–Thouless transition; Otto engine; mean-field approximation q-state clock model; entropy; Berezinskii–Kosterlitz–Thouless transition; Otto engine; mean-field approximation
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MDPI and ACS Style

Aguilera, M.A.; Peña, F.J.; Negrete, O.A.; Vargas, P. Otto Engine for the q-State Clock Model. Entropy 2022, 24, 268.

AMA Style

Aguilera MA, Peña FJ, Negrete OA, Vargas P. Otto Engine for the q-State Clock Model. Entropy. 2022; 24(2):268.

Chicago/Turabian Style

Aguilera, Michel Angelo, Francisco José Peña, Oscar Andrés Negrete, and Patricio Vargas. 2022. "Otto Engine for the q-State Clock Model" Entropy 24, no. 2: 268.

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