Semenov S, Rubtsov AN. Landau free energy of small clusters beyond mean-field approach.
Phys Rev E 2024;
110:L012101. [PMID:
39160974 DOI:
10.1103/physreve.110.l012101]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 06/11/2024] [Indexed: 08/21/2024]
Abstract
Landau free energy determines the landscape of order parameter fluctuations that occur in a physical system at thermal equilibrium and, in particular, characterizes the critical phenomena. We propose a semianalytical approach based on the fluctuating local field method, which allows us to estimate Landau free energy for small clusters with discrete (Ising model) and continuous (Heisenberg model) order parameter.
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