Low Energy Quasiparticle Excitation in the Vortex State of Borocarbide Superconductor YNi2B2C
K. Izawa, A. Shibata, Yuji Matsuda, Y. Kato, H. Takeya, K. Hirata, C. J. van der Beek, M. Konczykowski
DOI 10.1103/PhysRevLett.86.1327 · Physical Review Letters
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Abstract
We measured the heat capacity Cp and microwave surface impedance Zs in the vortex state of YNi2B2C. In contrast to conventional s-wave superconductors, Cp shows a H dependence. This H dependence persists even after the introduction of the columnar defects which change the electronic structure of the vortex core regime and destroy the regular vortex lattice. On the other hand, flux flow resistivity is nearly proportional to H. These results indicate that the vortex state of YNi2B2C is fundamentally different from the conventional s-wave counterparts, in that the delocalized quasiparticle states around the vortex core are important, similar to d-wave superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.4 | Pressure not reported | unknown |
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.4 | Pressure not reported | unknown |
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