Pairing-bag excitations in small-coherence-length superconductors
Abstract
Localized baglike solutions in the pairing theory of superconductivity are studied. Starting from the Bogoliubov-de Gennes equations on a two-dimensional square lattice for half-filled negative-U Hubbard model, cigar- and star-shaped bags are numerically obtained, inside of which the order parameter is reduced, self-consistently trapping an added quasiparticle. These nonlinear excitations are important when the coherence length is small as for the new high-temperature superconductors. Several experimental consequences are discussed.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 1988
- DOI:
- Bibcode:
- 1988PhRvL..61.2709B
- Keywords:
-
- Atomic Excitations;
- Bogoliubov Theory;
- Energy Gaps (Solid State);
- Pair Production;
- Superconductivity;
- Fermi Surfaces;
- Ground State;
- High Temperature Superconductors;
- Infrared Absorption;
- Solid-State Physics;
- 74.65.+n;
- 74.20.-z;
- 74.70.Vy;
- Theories and models of superconducting state