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Anisotropy of flux-flow resistivity in UPt3

N. Lutke-Entrup·R. Blaauwgeers·B. Placais·A. Huwley·S. Kambe·M. Krusius·P. Mathieu·Y. Simon
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Abstract

The ac prenetration depth, λ_ac(T,H,f), has been measured in superconducting UPt3 single crystals for H\parallel c and H\perp c in the range f=0.01-1MHz and T=0.1-0.4 K. The contributions from bulk pinning and surface pinning have been separated out to yield the flux-flow resistivity ρ_f(H). With H\perp c, rho_f displays magneto-resistance at low field which agrees with previous dc measurements and the characteristic scaling law of clean crystals with anisotropic gap. When H\parallel c, the low-field ρ_f is three times larger. We interpret this property as evidence for flux line with unconventional core structure.

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N. Lutke-Entrup, R. Blaauwgeers, B. Placais, A. Huwley, S. Kambe, M. Krusius, P. Mathieu, Y. Simon. 2000-09-06. Anisotropy of flux-flow resistivity in UPt3. https://arxiv.org/abs/cond-mat/0009079

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