Critical current and vortex properties in FeS<sub>1-x</sub>Se<sub>x</sub> (x = 0, 0.06)

ORAL

Abstract

We report the critical current, vortex pinning mechanism, and irreversibility field in FeS1-xSex (x = 0, 0.06) single crystals. Critical current in FeS is comparable to that in KxFe2-ySe2 with much higher Tc. Fitting reduced field dependence of pinning force with Dew-Hughes model indicates that pinning center is core-normal surfacelike. Reduced temperature dependence of critical current indicates that dominant interaction of vortex cores and pinning centers is via scattering of charge carriers with reduced mean free path (δl). Crossover behavior in field dependence of depinning energy U0 was observed. The proximity of the irreversibility lines to the upper critical field (Hc2) is consistent with strong pinning in FeS and FeS0.94Se0.06. Large critical current and strong pinning suggest that FeS can serve as building blocks for new superconductors with high critical current.

*The work was supported by the Center for Emergent Superconductivity, an Energy Frontier Research Center funded by the U.S. DOE, Office of Basic Energy Sciences, in part by U.S. DOE under Contract No. DEAC02-98CH10886. It was also supported by Grant No. 171001 from the Serbian Ministry of Education and S

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Presenters

  • Aifeng Wang

    • Brookhaven Natl Lab

Authors

  • Aifeng Wang

    • Brookhaven Natl Lab

  • Lijun Wu

    • Condensed Matter Physcis and Materials Science Departement, Brookhaven National Laboratory
    • Brookhaven National Laboratory
    • Brookhaven Natl Lab

  • V. N. Ivanovski

    • Institute of Nuclear Sciences Vinca, University of Belgrade

  • J. B. Warren

    • Brookhaven Natl Lab

  • Jianjun Tian

    • Brookhaven Natl Lab

  • Yimei Zhu

    • Condensed Matter Physcis and Materials Science Departement, Brookhaven National Laboratory
    • Brookhaven National Laboratory
    • Condensed Matter Physics & Materials Science, Brookhaven National Laboratory
    • Brookhaven Natl Lab
    • Brookhaven National Lab
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory

  • Cedomir Petrovic

    • Brookhaven National Laboratory
    • Brookhaven Natl Lab
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
    • Brookhaven National Lab