Nonlocal Effects and Shrinkage of the Vortex Core Radius in YNi2B2C Probed by muSR

Details Nonlocal Effects and Shrinkage of the Vortex Core Radius in YNi2B2C Probed by muSR Nonlocal Effects and Shrinkage of the Vortex Core Radius in YNi2B2C Probed by muSR

2002-01-04

arxiv.org/abs/cond-mat/0201038v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.65.140505

The magnetic field distribution in the vortex state of YNi2B2C has been probed by muon spin rotation (muSR). The analysis based on the London model with nonlocal corrections shows that the vortex lattice has changed from hexagonal to square with increasing magnetic field H. At low fields the vortex core radius, rho_v(H), decreases with increasing H much steeper than what is expected from the sqrt(H) behavior of the Sommerfeld constant gamma(H), strongly suggesting that the anomaly in gamma(H) primarily arises from the quasiparticle excitations outside the vortex cores.

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