Physics – Condensed Matter – Superconductivity
Scientific paper
1997-08-15
Physical Review Letters 79, p1742 (1997)
Physics
Condensed Matter
Superconductivity
4 pages, RevTeX, 4 encapsulated postscript figures, (to appear in Phys. Rev. Lett. 25Aug97 issue)
Scientific paper
10.1103/PhysRevLett.79.1742
Muon-spin rotation spectroscopy has been used to measure the internal magnetic field distribution in NbSe2 for Hc1 << H < 0.25 Hc2. 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 the core radius depends on the intervortex spacing is used to model this behaviour. In addition, we find for the first time that the in-plane magnetic penetration depth increases linearly with H in the vortex state of a conventional superconductor.
Brewer Jess H.
Brill Joseph W.
Chakhalian Jacques
Dunsiger S. R.
Kiefl R. F.
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