Phase Fluctuations and BCS-LP Crossover in 2D Short Coherence Length Superconductors

• Authors: B. Tobijaszewska , R. Micnas
• Languages of publication: EN

Abstracts

EN

We study the effects of phase fluctuations in 2D short-coherence length superconductors on the basis of the extended Hubbard model with intersite attraction. In the Kosterlitz-Thouless scenario the critical temperatures for anisotropic pairings were determined and compared with the ones from BCS Hartree-Fock approximation. The Uemura-type plots, i.e. the critical temperature vs. zero temperature phase stiffness, were obtained for extended s-wave and d_{x^{2}-y^{2}}-wave pairings. We also discuss the crossover from BCS to local pair superconductivity for d-wave pairing.

Keywords

EN

74.20.-z; 71.10.Fd; 74.20.Fg; 74.20.Mn; 74.72.-h

Discipline

• 74.72.-h: Cuprate superconductors
• 74.20.Fg: BCS theory and its development
• 74.20.-z: Theories and models of superconducting state
• 74.20.Mn: Nonconventional mechanisms
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)

• Journal: Acta Physica Polonica A
• Year: 2000
• Volume: 97
• Issue: 3
• Pages: 393-397

Dates

published

2000-03

Contributors

author

B. Tobijaszewska

• Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

R. Micnas

• Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

Identifiers

DOI

10.12693/APhysPolA.97.393