The microwave complex surface impedance Zs of Y(Ni1-xPtx)2B2C was measured at 0.5 K under magnetic fields H up to 7 T. In nominally pure YNi2B2C, which is a strongly anisotropic s-wave superconductor, the flux flow resistivity ρf calculated from Zs was twice as large as that expected from the conventional normal-state vortex core model. In Pt-doped samples where the gap anisotropy is smeared out, the enhancement of ρf is reduced and ρf approaches the conventional behavior. These results indicate that the energy dissipation in the vortex core is strongly affected by the anisotropy of the superconducting gap.
|Number of pages||5|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Nov 1 2002|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics