Anisotropy of flux-flow resistivity in UPt3
Lutke-Entrup, N. · Blaauwgeers, R. · Placais, B. · Huwley, A. · Kambe, S. · Krusius, M. · Mathieu, P. · Simon, Y.
Original · EN
The ac prenetration depth, λₐc(T,H,f), has been measured in superconducting UPt3 single crystals for H∥ c and H⊥ 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 ρf(H). With H⊥ c, rhof 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∥ c, the low-field ρf is three times larger. We interpret this property as evidence for flux line with unconventional core structure.
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