ISSN:
1573-7357
Keywords:
85.25. Cp
;
74.50.+r
;
85.70.-w
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02399621
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