Magnetocaloric effect in the Potts model based on the effective-field theory

Autor(es)

Morais, R. H. M. ^[1] ; Santos, J. P. ^{[1, 2]} ; Oliveira, S. ^{[1, 3]} ; Mendes, R. G. B. ^[1] ; Rosa, D. S. ^[4] ; Francisco, R. M. ^[1] ; Barreto, F. C. Sa ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Joao del Rei, Dept Ciencias Nat, CP 110, BR-36301160 Sao Joao Del Rei, MG - Brazil

^[2] Univ Fed Sao Joao del Rei, Dept Matemat, CP 110, BR-36301160 Sao Joao Del Rei, MG - Brazil

^[3] Inst Fed Minas Gerais, Dept Ciencias & Linguagens, Bambui - Brazil

^[4] Inst Tecnol Aeronaut, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[5] Univ Fed Minas Gerais, Dept Fis, CP 110, BR-31270901 Belo Horizonte, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physics Letters A; v. 424, FEB 6 2022.
• Citações Web of Science: 0

Resumo

This work investigates the characteristics of the magnetocaloric effect in the first-order phase transitions of the q state Potts model, using the Effective Field Theory in a lattice with coordination number z = 6. The Maxwell relations were used to study the equilibrium behavior of the thermodynamic quantities and the Clausius-Clapeyron was associated with it in the cases with discontinuity in the order parameter of the model. The starting point is a detailed analysis of magnetic properties as a function of temperature and external field. From there, the first-order phase transitions were studied, related to temperatures and external transition fields in the temperature ranges that present first-order phase transitions. Next, we present results of the magnetocaloric effects for the states q = [2, 3, 4, 6], considering the first-order phase transitions with the system in equilibrium. The results showed convergence with others obtained from theoretical and experimental data. (C) 2021 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 20/00560-0 - Aspectos dimensionais na Física de Poucos Corpos
• Beneficiário: Dérick dos Santos Rosa
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado