Pair condensation in a finite Fermi system

2007 ◽  
Vol 75 (5) ◽  
Author(s):  
M. Sambataro
Keyword(s):  
Fermi System ◽  
Finite Fermi System ◽  
Pair Condensation

Free surface response in a finite Fermi system

1998 ◽  
Vol 57 (5) ◽  
pp. 2342-2350 ◽  
Author(s):  
V. I. Abrosimov ◽  
O. I. Davidovskaja ◽  
V. M. Kolomietz ◽  
S. Shlomo
Keyword(s):  
Free Surface ◽  
Fermi System ◽  
Finite Fermi System ◽  
Surface Response

scholarly journals Oscillations of the inertia moment of a finite Fermi system in the cranking model framework

2013 ◽  
Vol 176 (3) ◽  
pp. 1220-1235 ◽  
Author(s):  
A. A. Khamzin ◽  
A. S. Nikitin ◽  
A. S. Sitdikov ◽  
D. A. Roganov
Keyword(s):  
Fermi System ◽  
Finite Fermi System ◽  
Model Framework ◽  
Inertia Moment

Monopole modes in a finite Fermi system with diffuse reflection boundary conditions

1994 ◽  
Vol 571 (1) ◽  
pp. 117-131 ◽  
Author(s):  
V.M. Kolomietz ◽  
A.G. Magner ◽  
V.M. Strutinsky ◽  
S.M. Vydrug-Vlasenko
Keyword(s):  
Boundary Conditions ◽  
Diffuse Reflection ◽  
Fermi System ◽  
Finite Fermi System ◽  
Reflection Boundary

The Microscopic Theory of Superfluidity and Superconductivity Driven by Single Particle and Pair Condensation of Attracting Bosons

1998 ◽  
Vol 12 (21) ◽  
pp. 2151-2224 ◽  
Author(s):  
S. Dzhumanov
Keyword(s):  
Phase Transition ◽  
Order Phase Transition ◽  
Single Particle ◽  
Microscopic Theory ◽  
Order Parameters ◽  
Coupling Constants ◽  
Bose Liquid ◽  
Composite Bosons ◽  
Superfluidity And Superconductivity ◽  
Pair Condensation

A original microscopic theory of superfluidity and superconductivity driven by the single particle (SPC) and pair condensation (PC) of attracting bosons both in Fermi and in Bose systems is developed. This theory (as distinct from the existing theories) for Fermi systems contains two order parameters Δ F and Δ B characterizing the attracting fermion pairs and boson pairs, respectively. In such systems superconducting (SC) phase transition is accompanied, as a rule, by the formation of k-space composite bosons (e.g. Cooper pairs and bipolarons) with their subsequent transition to the superfluid (SF) state by attractive SPC and PC. A novel Fermi-liquid and SF Bose-liquid theories are elaborated for description this two-stage Fermi–Bose-liquid (FBL) scenario of SC (or SF) transition. The crossover from k- to real (r)-space pairing regime for BCS-like coupling constants γ F ≃ 0.7-0.9 and the irrelevance of r-space pairs to the superconductivity are shown. The developed SF Bose-liquid theory predicts the first-order phase transition SPC ↔ PC of attracting 3d-bosons with the kink-like behaviors of all SC (SF) parameters near [Formula: see text] in accordance with the observations in 4 He , 3 He and superconductors. It is argued that the coexistence of the order parameters Δ F and Δ B leads to the superconductivity by two FBL scenarios. One of these scenarios is realized in the so-called fermion (type I, II and III) superconductors (FSC) (where formation of k-space composite bosons and their condensation occur at the same temperature) and the other in the boson (type II and III) superconductors (BSC) (where BCS-like pairing take place in the normal state with manifesting of the second-order phase transition and opening of the pseudogap at T=T F > T c ). There the gapless superfluidity (superconductivity) is caused by the gapless excitation spectrum of bosons at [Formula: see text] and not by the presence of point or line nodes of the BCS-like gap Δ F assumed in some s-, p- and d-pairing models. The 3D- and 2D-insulator–metal–superconductor phase diagrams are presented. The necessary and sufficient microscopic criterions for superfluidity is formulated. The theory proposed are in close agreement with the observations in 4 He , 3 He , superconductors, nuclear and neutron star matter, cosmology, etc.

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