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Paper detail

Flux quanta driven by high-density currents in low-impurity V3Si and LuNi2B2C: free flux flow and flux-core size effect

High density direct currents (DC) are used to drive flux quanta via the Lorentz force towards 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 rho_f. 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 rho_f is shown to be consistent with a prediction based on a model for the decrease of flux core size at higher fields in weak-coupling BCS s-wave materials.

preprint2009arXivOpen access
A. A. GapudS. MoraesR. P. KhadkaP. C. CanfieldV. G. KoganA. P. ReyesL. L. LumataD. K. ChristenJ. R. Thompson
cond-mat.supr-con
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A. A. GapudS. MoraesR. P. KhadkaP. C. CanfieldV. G. KoganA. P. ReyesL. L. LumataD. K. ChristenJ. R. Thompson

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