Second Superconducting Transition Driven by Charge Density Wave
Abstract
Instability of charge density wave can drive successive superconducting transitions. The transition at a lower temperature can be detected by the softening of phonons, whose symmetry is compatible with the symmetry of the product of the two superconducting order parameters. It is argued that the second transition is responsible for tiny anomalies around Tc2≈35 K in high-temperature superconductors YBa2Cu3O7 with superconducting critical temperature Tc≈90 K. It is also argued that the anisotropic Cooper pairing is responsible for high-temperature superconductivity not only in YBa2Cu3O7 but also in the other cuprate oxides.
- Publication:
-
Journal of the Physical Society of Japan
- Pub Date:
- February 1992
- DOI:
- 10.1143/JPSJ.61.639
- Bibcode:
- 1992JPSJ...61..639O
- Keywords:
-
- Charge Distribution;
- Copper Oxides;
- High Temperature Superconductors;
- Mixed Oxides;
- Transition Temperature;
- Barium Oxides;
- Bcs Theory;
- Density Wave Model;
- Green'S Functions;
- Yttrium Oxides;
- Solid-State Physics