Magnetic-field-induced Josephson-junction (JJ) behavior in a highly transparent weak link was observed at the 5° tilt low angle grain boundary (LAGB) in a Y Ba2 Cu3 O7-δ film. The magnetic field dependence of current density-voltage curves showed that Abrikosov Josephson (AJ) vortices exist in the LAGB. Both JJ and flux-flow (FF) behaviors were observed in a single LAGB depending on the temperature and magnetic field. The crossover from FF to JJ arose from the spread of the phase variation along the junction when the AJ vortex cores overlapped at B* = 0 (4.4l)2, where l is the characteristic length of AJ vortex.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Jan 24 2007|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics