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Title: Superfluidity of heated Fermi systems in the static fluctuation approximation

Superfluidity properties of heated finite Fermi systems are studied in the static fluctuation approximation, which is an original method. This method relies on a single and controlled approximation, which permits taking correctly into account quasiparticle correlations and thereby going beyond the independent-quasiparticle model. A closed self-consistent set of equations for calculating correlation functions at finite temperature is obtained for a finite Fermi system described by the Bardeen–Cooper–Schrieffer Hamiltonian. An equation for the energy gap is found with allowance for fluctuation effects. It is shown that the phase transition to the supefluid state is smeared upon the inclusion of fluctuations.
Authors:
 [1] ; ;  [2]
  1. Kazan (Volga Region) Federal University, Institute of Physics (Russian Federation)
  2. Kazan State Power Engineering University (KSPEU) (Russian Federation)
Publication Date:
OSTI Identifier:
22472090
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 78; Journal Issue: 7; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; APPROXIMATIONS; BCS THEORY; CORRELATION FUNCTIONS; CORRELATIONS; ENERGY GAP; FLUCTUATIONS; HAMILTONIANS; PHASE TRANSFORMATIONS; QUASIPARTICLE-PHONON MODEL; SUPERFLUIDITY