Abstract
Muon-spin rotation spectroscopy has been used to measure the internal magnetic field distribution in for . The deduced profiles of the supercurrent density indicate that the vortex-core radius in the bulk decreases sharply with increasing magnetic field. This effect, which is attributed to increased vortex-vortex interactions, does not agree with the dirty-limit microscopic theory. A simple phenomenological equation in which depends on the intervortex spacing is used to model this behavior. In addition, we find for the first time that the in-plane magnetic penetration depth increases linearly with in the vortex state of a conventional superconductor.
- Received 19 March 1997
DOI:https://doi.org/10.1103/PhysRevLett.79.1742
©1997 American Physical Society