Low Energy Quasiparticle Excitation in the Vortex State of Borocarbide Superconductor YNi_2B_2C

Details Low Energy Quasiparticle Excitation in the Vortex State of Borocarbide Superconductor YNi_2B_2C Low Energy Quasiparticle Excitation in the Vortex State of Borocarbide Superconductor YNi_2B_2C

2000-12-09

arxiv.org/abs/cond-mat/0012152v3

Phys. Rev. Lett. 86, 1327 (2001)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.86.1327

We have measured the low temperature heat capacity Cp and microwave surface impedance Zs in the vortex state of YNi_2B_2C. In contrast to conventional s-wave superconductors, Cp shows a nearly \sqrt H-dependence. This \sqrt H-dependence persists even after the introduction of the columnar defects which change the electronic structure of the vortex core regime dramatically and strongly disturb the regular vortex lattice. On the other hand, flux flow resistivity obtained from Zs is nearly proportional to H. Taken together, these results indicate that the vortex state of YNi_2B_2C is fundamentally different from the conventional s-wave counterparts, in that the delocalized quasiparticle states around the vortex core play a much more important role, similar to d-wave superconductors.

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