We have performed V-I measurements on a thin film YBa2Cu3O7 4^o [001] tilt low angle grain boundary over an extensive range of temperature and field, verifying the presence of a linear characteristic. We report on the occurrence of the linear characteristic in its basic form and on the observation of V-I kinking into several, and in some cases numerous, linear segments. We interpret these findings in terms of a variation in the dissipative width at the grain boundary. Kinking from one linear V-I section to another of different gradient is described in terms of a change in the number of vortex rows being viscously channeled along the boundary.
@article{arxiv.cond-mat/0101303,
title = {Vortex Channeling and the V-I Characteristic of YBa2Cu3O7 Low Angle Grain Boundaries},
author = {M. J. Hogg and F. Kahlmann and E. J. Tarte and Z. H. Barber and J. E. Evetts},
journal= {arXiv preprint arXiv:cond-mat/0101303},
year = {2009}
}
Comments
14 pages including 4 figures. To be published in Applied Physics Letters