Strong vortex pinning in the low-temperature superconducting phase of (U_1-xTh_x)Be_13

Preprint

13 January 2000

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0001185

Abstract

We have found a sharp transition at T_c2=350 mK in the vortex creep rate of a single crystal of (U_1-xTh_x)Be_13 with T_c=523 mK (x=0.0275). For T<<T_c2, no creep of vortices is observed in a time scale of 10^5 s, while for T_c2<T<T_c, vortices creep at very high rates (30 % of decay from a metastable configuration in the first 10^5 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 UPt_3.

Keywords

SUPERCONDUCTING PHASE
SHARP TRANSITION
VORTEX PINNING
METASTABLE
U_1 XTH_X
BE_13
CREEP
XTH_X

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