Mean-field theory of non-thermodynamic phase transitions for an ensemble of interacting quantum objects
- Autores: Rozenfeld E.V.1, Mushnikov N.V.1
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Afiliações:
- Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
- Edição: Volume 126, Nº 2 (2025)
- Páginas: 151-159
- Seção: ЭЛЕКТРИЧЕСКИЕ И МАГНИТНЫЕ СВОЙСТВА
- URL: https://rjdentistry.com/0015-3230/article/view/683429
- DOI: https://doi.org/10.31857/S0015323025020039
- EDN: https://elibrary.ru/AZEGUW
- ID: 683429
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Resumo
Phase transitions for an open system consisting of an ensemble of interacting quantum subsystems with discrete spectrum are studied in the mean-field approximation. In the considered model, the change of an internal symmetry of a thermodynamic system upon the second-order phase transition is due to changing symmetry of distribution of charge/spin density inside each quantum subsystem. The latter can be caused by either splitting of one of lowest degenerated energy level or closing a gap between the levels and appearance of avoided crossing. The effect of external parameters (pressure, field, composition, etc.) results in direct change of internal control parameters: level spacing and/or the strength of interaction between adjacent quantum subsystems. Considering a simplest case of the two-level quantum subsystems, expressions for the free energy as a function of the internal control parameters were obtained in analytical form. The behavior of the heat capacity and susceptibility for different regions of the low-temperature phase diagram including the area of quantum fluctuations was determined.
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Sobre autores
E. Rozenfeld
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Autor responsável pela correspondência
Email: mushnikov@imp.uran.ru
Rússia, Ekaterinburg
N. Mushnikov
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Email: mushnikov@imp.uran.ru
Rússia, Ekaterinburg
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