Phys. Rev. B 80, 134524 (2009) [5 pages]Flux quanta driven by high-density currents in low-impurity V3Si and LuNi2B2C: Free flux flow and fluxon-core size effectReceived 15 April 2009; revised 8 September 2009; published 30 October 2009 High-density direct currents are used to drive flux quanta via the Lorentz force toward a highly ordered “free flux flow” (FFF) dynamic state, made possible by the weak-pinning environment of high-quality, single-crystal samples of two low-Tc superconducting compounds, V3Si and LuNi2B2C. We report the effect of the magnetic field-dependent fluxon-core size on flux flow resistivity ρf. Much progress has been made in minimizing the technical challenges associated with the use of high currents. Attainment of a FFF phase is indicated by the saturation at highest currents of flux flow dissipation levels that are well below the normal-state resistance and have field-dependent values. The field dependence of the corresponding ρf is shown to be consistent with a prediction based on a model for the decrease of fluxon-core size at higher fields in weak-coupling BCS s-wave materials. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.134524
DOI:
10.1103/PhysRevB.80.134524
PACS:
74.25.Qt
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