scholarly journals Effective gap equation for the inhomogeneous Larkin-Ovchinnikov-Fulde-Ferrel superconductive phase

2004 ◽  
Vol 70 (5) ◽  
Author(s):  
R. Casalbuoni ◽  
M. Ciminale ◽  
M. Mannarelli ◽  
G. Nardulli ◽  
M. Ruggieri ◽  
...  
Keyword(s):  
Gap Equation ◽  
Superconductive Phase

The effective potential and its connection with the gap equation

1993 ◽  
Vol 395 (3) ◽  
pp. 581-595 ◽  
Author(s):  
G. Cvetič ◽  
E.A. Paschos
Keyword(s):  
Effective Potential ◽  
Gap Equation

Anisotropic Order Parameter in Two-Band Superconductivity

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3099-3101 ◽  
Author(s):  
P. Konsin ◽  
N. Kristoffel ◽  
P. Rubin
Keyword(s):  
Order Parameter ◽  
Equation System ◽  
Order Parameters ◽  
Band Model ◽  
Gap Equation ◽  
Narrow Region ◽  
Interband Scattering ◽  
Parameter Symmetry ◽  
Order Parameter Symmetry

A two-overlapping band model of superconductivity with s+d interband scattering is investigated. The gap equation system has been solved numerically. Solutions of pure-d and -s, or of mixed s+d nature are possible. The pure Tcd(μ) or Tcs(μ) curves determine the onset of superconductivity with temperature lowering. In the under- and over-doped region pure-symmetry orderings are preferred. Mixed ordering can exist in a narrow region of μ, becoming narrower with T rising. The peculiarities of the and spectra are reflected in the behaviour of the order parameters. Order parameter symmetry can change with T and μ.

THE COMPOSITION AND STRUCTURE OF Y-Ba-Cu-O SUPERCONDUCTORS

1987 ◽  
Vol 01 (02) ◽  
pp. 341-349
Author(s):  
Z.Y. Hua ◽  
C.L. Jia ◽  
H.S. Cheng ◽  
Y.M. Cai ◽  
A.R. Jiang
Keyword(s):  
Single Phase ◽  
Nominal Composition ◽  
High Tc Superconductors ◽  
Small Particles ◽  
High Tc ◽  
Third Phase ◽  
Composition And Structure ◽  
The Difference ◽  
Phase Phase ◽  
Superconductive Phase

High Tc superconductors of Y-Ba-Cu-O system with (Y+Ba):Cu=1~2 have been investigated. Results show that any sample in this system with a proportion of Y:Cu between 0.6 and 1.2 is oxygen-deficient and will be superconductive after sintering in an oxygen flow. In this system all superconductors with different nominal composition have a superconductive phase of perovskite-1ike YBa2Cu3O7 (Phase A), and the difference of constituents is shown in another phase (Phase B) which acts as a gettering center. When the composition has an excess of Y, there will be a third phase (Phase C) which has been identified as small particles of Y2O3 . For an exact nominal proportion of Y:Ba:Cu=1:2:3 , single-phase superconductors can be prepared.

Pairon Green’s function for high-Tc superconductors

2020 ◽  
pp. 2150080
Author(s):  
Radhika Chauhan ◽  
B. D. Indu
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Quantum Dynamics ◽  
Nodal Point ◽  
Superconducting Gap ◽  
Energy Relation ◽  
Gap Equation ◽  
Gap Ratio ◽  
Many Body Quantum Dynamics ◽  
The Many

Considering the many-body quantum dynamics, the pairon Green’s function has been developed via a Hamiltonian that encompasses the contribution of pairons, pairon-phonon interactions, anharmonicities, and defects. To obtain the renormalized pairon energy dispersion, the most relevant Born–Mayer–Huggins potential has been taken into account. The Fermi surface for the representative [Formula: see text] high-[Formula: see text] superconductor has been obtained via renormalized pairon energy relation. This revealed the [Formula: see text]-shape superconducting gap with a nodal point along [Formula: see text] direction. Further, the superconducting gap equation has been derived using the pairon density of states. The developed gap equation is the function of temperature, Fermi energy, and renormalized pairon energy. The temperature variation of the gap equation is found to be in good agreement with the BCS gap equation. Also, this reveals the reduced gap ratio ([Formula: see text] for [Formula: see text]) in the limit (5–8) of the reduced gap ratio designated for high-[Formula: see text] superconductors.

Wigner Solution to the Quark Gap Equation in the Nonzero Current Quark Mass

2012 ◽  
Vol 29 (4) ◽  
pp. 041201 ◽  
Author(s):  
Yu Jiang ◽  
Hao Gong ◽  
Wei-Min Sun ◽  
Hong-Shi Zong
Keyword(s):  
Quark Mass ◽  
Gap Equation ◽  
Current Quark Mass ◽  
Current Quark
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