Anisotropy of flux-flow resistivity in UPt3
Abstract
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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