Influence of disorder on the vortex pinning and cutting of YBa$_2$Cu$_3$O$_7$ films

ORAL

Abstract

Flux cutting and recombination has been used to explain high critical current densities ($J_c$) observed in experiments done in Force-Free (FF) and Variable Lorentz Force(VLF) configurations \textit{i.e.}, when the current $I$ is totally or partially aligned to the applied magnetic field $H$. However, the effect of different pinning centers has not been studied. We present angular and field $J_c$ studies in FF and VLF configurations and study the effects of random, correlated and extended defects on the $J_c$ of YBa$_2$Cu$_3$O$_7$ films. Results are analyzed in terms of vortex pinning at different defects and vortex cutting mechanism. We show that pinning greatly influences $J_c$ in FF and VLF, up to the point of obtaining $J_c$ higher than $J_c(H=0) $ up to magnetic fields as high as 3T

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Authors

  • B. Maiorov

    • Superconductivity Technology Center, LANL, Los Alamos, NM
    • MPA-STC, LANL, Los Alamos, NM 87544

  • L. Civale

    • Superconductivity Technology Center, LANL, Los Alamos, NM

  • Q.X. Jia

    • Superconductivity Technology Center, LANL, Los Alamos, NM

  • H. Zhou

    • Superconductivity Technology Center, LANL, Los Alamos, NM

  • S.R. Foltyn

    • Superconductivity Technology Center, LANL, Los Alamos, NM

  • T.G. Holesinger

    • Superconductivity Technology Center, LANL, Los Alamos, NM

  • S. Baily

    • Superconductivity Technology Center and National High Magnetic Field Laboratory, LANL, Los Alamos, NM

  • H. Wang

    • Texas A \& M University, College Station, TX

  • J.L. MacManus-Driscoll

    • Dept. of Materials Science, University of Cambridge, UK

  • T.N. Haugan

    • Air Force Research Laboratory, Wright-Patterson Air Force Base, OH

  • P.N. Barnes

    • Air Force Research Laboratory, Wright-Patterson Air Force Base, OH