Abstract
Muon spin rotation (µSR) has emerged as the leading experimental probe of theeffective size of magnetic vortices in type-II superconductors.µSR data on several different classes of type-II superconductors show that the innerstructure of a vortex can depend quite strongly on temperature and the strength ofthe external magnetic field. In this paper it is shown that these behaviours arerelated to the quasiparticle excitation spectrum both inside and outside of thevortex cores. Here we establish that the vortex core size determined by means ofµSR is particularly sensitive to the nature of the superconducting energy gap(s)and the symmetry of the Fermi surface. A survey of results for differentsuperconductors arrives at the conclusion that the large vortex core size observed inYBa2Cu3O7−δ is due to CuO chain superconductivity.
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