Abstract
Muon spin rotation has been used to investigate the magnetic-field distribution in the vortex state of superconducting LuNi 2 B 2 C (T c 16 K). Data for the magnetic field range 0.06H c 2 ≤H≤0.23H c 2 are fitted to a nonlocalLondon model. The temperature dependence of the vortex core radius shows a clear Kramer-Pesch effect due to depopulation of bound states within the cores. Also, the penetration depth and core radius vary substantially with applied magnetic field, suggesting the presence of anomalous field-induced quasiparticles and vortex-vortex interactions.
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