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Quasiparticle tunneling in HTS grain boundary Josephson junctions

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Abstract

The quasiparticle tunneling (QPT) in YBa2Cu3O7−δ (YBCO), Bi2Sr2CaCu2O8+x (BSCCO), Nd1.85Ce0.15CuOx (NCCO) and La1.85Sr0.15CuO4−δ (LSCO) grain boundary Josephson junctions (GBJs) has been studied. At voltages above the gap voltage V9, the measured conductance vs. voltage, G(V), curves show a temperature independent parabolic shape allowing the determination of the effective height and thickness of the insulating grain boundary barrier. At |V|<Vg, the G(V)-curves are well fitted by a BCS density of states and temperature dependence of the energy gap, if a large broadening parameter Γ is assumed for the gap. The large Γ value most likely is related to the high density of localized states within the grain boundary barrier. Furthermore, a zero-bias conductance anomaly is observed which can be analyzed in terms of spin-flip and Kondo-type scattering at the interface (Anderson-Appelbaum model).

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Author notes

  1. O. M. Froehlich

    Present address: Department of Physics, University of California at Berkeley, 94720, Berkeley, CA, USA

Authors and Affiliations

  1. II. Physikalisches Institut, Lehrstuhl für Angewandte Physik, Universität zu Köln, Zülpicherstr. 77, D-50937, Köln, Germany

    O. M. Froehlich, P. Richter, A. Beck & R. Gross

  2. Physics Department and Crown Center for Superconductivity, Technion, Israel

    G. Koren

  3. Institute of Technology, 32000, Haifa, Israel

    G. Koren

Authors
  1. O. M. Froehlich
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  2. P. Richter
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  3. A. Beck
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  4. R. Gross
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  5. G. Koren
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Froehlich, O.M., Richter, P., Beck, A. et al. Quasiparticle tunneling in HTS grain boundary Josephson junctions. J Low Temp Phys 106, 243–248 (1997). https://doi.org/10.1007/BF02399621

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