Abstract
We performed the surface impedance measurement on almost optimally doped untwinned YBa2(Cu1−xZnx)3Oy crystals under dc magnetic fields parallel to the c-axis, and determined the dependence of the vortex viscosity, η, and the pinning constant, κp on Zn concentration. Both η and κp changed dramatically from those of pure YBa2Cu3Oy by 6%-Zn-doping. It can be explained by the strong overlap of the Zn potential and suppression of the amplitude of the superconducting (SC) order parameter caused by the pair-breaking effect of Zn. We also determined the relaxation time (RT) of quasiparticles (QPs) in the vortex core, in the normal state, and in the Meissner state. It is suggested that the mechanism which determines the RT of the QP is different between outside and inside the vortex core. It is also suggested that RT of QP in the vortex core becomes smaller than in the normal state for the superconductors which have nodes in the SC gap.
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