Interplay of Pairing Correlation and Coulomb Correlation in Boson Exchange Superconductors
arXiv:2010.03515 · doi:10.1140/epjb/s10051-021-00051-9
Abstract
A theoretical methodology for exploring the conventional Bardeen-Cooper-Schrieffer (BCS) pairing instability for superconductivity from a correlated normal phase for all possible degrees of many-body correlation, has been developed. The Gutzwiller projection scheme with a correlation parameter was made use of in generating the BCS pairing state. A variational scheme was thereafter implemented, leading to a self-consistent equation for superconducting gap function. This equation shows explicit dependence of the gap function on the many body correlation parameter. This `pairing-gap' and the corresponding self-consistent gap equation in zero correlation limit, becomes identical in nature with those of the pure (1-well) BCS formalism, as expected and the Coulomb correlation affects the pairing significantly with the strength of correlation. The detailed consequences are being presented here.
arXiv comment17 pages, 5 figures
References in corpus (11)
- Conventional superconductivity at 203 K at high pressures
- Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures
- Generalized Lanczos Algorithm for Variational Quantum Monte Carlo
- Evolution of Nuclear Spectra with Nuclear Forces
- Geminal wavefunctions with Jastrow correlation: a first application to atoms
- New Perspective on the Phase Diagram of Cuprate High-Temperature Superconductors
- Inhomogeneous d-wave superconducting state of a doped Mott insulator
- The phase diagram of the underdoped cuprates at high magnetic field
- Correlations in the low-density Fermi gas: Fermi-Liquid state, Dimerization, and BCS Pairing
- Calculation of generalized spin stiffness constant of strongly correlated doped quantum antiferromagnet on two-dimensional lattice and it's application to effective exchange constant for semi-itinerant systems
- Effective interaction in a non-Fermi liquid conductor and spin correlations in under-doped cuprates