Observation of Splintered Josephson Vortices at Grain Boundaries in YBa2Cu3O7-δ
Abstract
We have directly observed well-separated Josephson vortex splinters with unquantized magnetic flux at asymmetric 45° grain boundaries in YBa2Cu3O7-δ films by imaging magnetic flux with scanning SQUID microscopy. The existence of these splinter vortices has been predicted and is well described by a model based on dx2-y2 pairing symmetry and facetting of the grain boundary on a length scale shorter than the Josephson penetration depth.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 2002
- DOI:
- 10.1103/PhysRevLett.89.067004
- Bibcode:
- 2002PhRvL..89f7004M
- Keywords:
-
- 74.60.Ge;
- 74.50.+r;
- Tunneling phenomena;
- point contacts weak links Josephson effects