Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 11, Pages 2497-2500Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.2497
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We report on transport and magnetization studies of the critical current in single crystal ErNi2B2C for applied fields below 4 kG. Below T approximate to 2.5 K superconductivity coexists with weak ferromagnetism. We fmd that the critical currents are strongly enhanced for all field orientations in this ferromagnetic regime, corresponding to a threefold increase of the pinning force of the flux line lattice. We speculate that this increase is due to strong pair breaking by the ferromagnetism.
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