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

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A. A. Gapud, S. Moraes, R. P. Khadka, P. Favreau, and C. Henderson
Department of Physics, University of South Alabama, 307 University Boulevard N, Mobile, Alabama 36688, USA

P. C. Canfield and V. G. Kogan
Ames Laboratory, 111 TASF, Ames, Iowa 50011-3020, USA

A. P. Reyes and L. L. Lumata
National High Magnetic Field Laboratory, 1800 E Paul Dirac Drive, Tallahassee, Florida 32310-3706, USA

D. K. Christen
Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, Tennessee 37831-6092, USA

J. R. Thompson
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA and Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, Tennessee 37831-6092, USA

Received 15 April 2009; revised 8 September 2009; published 30 October 2009

High-densitydirect currents are used to drive flux quanta via theLorentz 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-T_c superconducting compounds, V₃Si and LuNi₂B₂C.We report the effect of the magnetic field-dependent fluxon-core sizeon flux flow resistivity rho _f. Much progress has been madein minimizing the technical challenges associated with the use ofhigh currents. Attainment of a FFF phase is indicated bythe saturation at highest currents of flux flow dissipation levelsthat are well below the normal-state resistance and have field-dependentvalues. The field dependence of the corresponding rho _f is shownto be consistent with a prediction based on a modelfor the decrease of fluxon-core size at higher fields inweak-coupling BCS s-wave materials.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.80.134524
DOI:	10.1103/PhysRevB.80.134524
PACS:	74.25.Qt 74.25.Qt Vortex lattices, flux pinning, flux creep YEAR: 2009
KEYWORDS:	boron compounds, electrical resistivity, flux flow, flux pinning, lutetium compounds, magnetic field effects, nickel compounds, superconducting materials, vanadium compounds

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