Pairing symmetry and flux quantization in a tricrystal superconducting ring of YBa2Cu3O7-δ
Abstract
We have used the concept of flux quantization in superconducting YBa2Cu3O7-δ rings with 0, 2, and 3 grain-boundary Josephson junctions to test the pairing symmetry in high-Tc superconductors. The magnetic flux threading these rings at 4.2 K is measured by employing a scanning superconducting quantum interference device microscope. Spontaneous magnetization of a half magnetic flux quantum, Φ0/2=h/4e has been observed in the 3-junction ring, but not in the 2-junction rings. These results are consistent with d-wave pairing symmetry.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 1994
- DOI:
- 10.1103/PhysRevLett.73.593
- Bibcode:
- 1994PhRvL..73..593T
- Keywords:
-
- 74.60.Ge;
- 74.72.Bk;
- Y-based cuprates