Effects of superconducting gap anisotropy on the flux flow resistivity in Y(Ni1−xPtx)2B2C

K. Takaki; A. Koizumi; T. Hanaguri; M. Nohara; H. Takagi; K. Kitazawa; Y. Kato; Y. Tsuchiya; H. Kitano; A. Maeda

doi:10.1103/PhysRevB.66.184511

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Effects of superconducting gap anisotropy on the flux flow resistivity in Y(Ni1−xPtx)2B2C

K. Takaki, A. Koizumi, T. Hanaguri, M. Nohara, H. Takagi, K. Kitazawa, Y. Kato, Y. Tsuchiya, H. Kitano, A. Maeda

DOI 10.1103/PhysRevB.66.184511 · Physical Review B

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Abstract

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.

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.	15.4	Pressure not reported	unknown
Y(Ni0.95Pt0.05)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13.7	Pressure not reported	unknown
Y(Ni0.8Pt0.2)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	12.1	Pressure not reported	unknown