Two-scale electron structure of copper-oxide superconductors and superconducting pairing mechanism
Abstract
An acceptor impurity distributed in a crystallographic plane parallel to the superconducting CuO2 plane produces a Coulomb potential in this plane with a large characteristic range. The bottom of the conduction band distorted by this potential plays the role of a secondary potential relief which is manifested in anisotropy of the conductivity and in Raman scattering anomalies. Van der Waals attraction sufficient for the formation of a superconducting gap with a width of tens of millielectronvolts takes place between the holes localized at the secondary relief minima. These phenomena are considered for the YBa2Cu3O(6+x) superconductor. The experimental data confirm the relation between the superconductivity mechanism and the secondary potential relief.
- Publication:
-
Fizika Nizkikh Temperatur
- Pub Date:
- February 1995
- Bibcode:
- 1995FizNT..21..208R
- Keywords:
-
- Atomic Structure;
- Copper Oxides;
- Holes (Electron Deficiencies);
- Superconductivity;
- Superconductors (Materials);
- Coulomb Potential;
- Crystal Structure;
- Van Der Waals Forces;
- Ybco Superconductors;
- Solid-State Physics