Strong vortex pinning in the low-temperature superconducting phase of (U1-xThx)Be13
Abstract
We have found a sharp transition at Tc2=350 mK in the vortex creep rate of a single crystal of (U1-xThx)Be13 with Tc=523 mK (x=0.0275). For T<<Tc2, no creep of vortices is observed in a time scale of 105 s, while for Tc2<T<Tc, vortices creep at very high rates (30 % of decay from a metastable configuration in the first 105 s at T=400 mK). The sharp transition occurs at the same temperature at which the second jump in the specific heat appears in these samples. Similar low levels of creep rates have been reported by us in the low-T superconducting phase of UPt3.
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