- PII
- S0015323025020039-1
- DOI
- 10.31857/S0015323025020039
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 126 / Issue number 2
- Pages
- 151-159
- Abstract
- 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.
- Keywords
- Date of publication
- 07.10.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 30
RAS PhysicsФизика металлов и металловедение Physics of Metals and Metallography
- ISSN (Print) 0015-3230
- ISSN (Online) 3034-6215
Mean-field theory of non-thermodynamic phase transitions for an ensemble of interacting quantum objects
Индексирование
Scopus
Crossref
Higher Attestation Commission
At the Ministry of Education and Science of the Russian Federation
Scientific Electronic Library