title: Enhanced critical currents of superconducting ErNi2B2C in the ferromagnetically ordered state
abstract: We report on transport and magnetization studies of the critical current in single crystal ErNi2B2C for applied fields below 4 kG. Below T approximately 2.5 K superconductivity coexists with weak ferromagnetism. We find 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.
authors.affiliation: Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
authors.initials: PL
authors.lastname: Gammel
authors.initials: B
authors.lastname: Barber
authors.initials: D
authors.lastname: Lopez
authors.initials: AP
authors.lastname: Ramirez
authors.initials: DJ
authors.lastname: Bishop
authors.initials: SL
authors.lastname: Bud'ko
authors.initials: PC
authors.lastname: Canfield