title: Anomalous Inner-Gap Structure in Transport Characteristics of Superconducting Junctions with Degraded Interfaces.
abstract: Quantitative description of charge transport across tunneling and break-junction devices with novel superconductors encounters some problems not present or not as severe for traditional superconducting materials. In this work, we explain unexpected features in related transport characteristics as an effect of a degraded nanoscaled sheath at the superconductor surface. A model capturing the main aspects of the ballistic charge transport across hybrid superconducting structures with normally conducting nanometer-thick interlayers is proposed. The calculations are based on a scattering formalism taking into account Andreev electron-into-hole (and inverse) reflections at normal metal-superconductor interfaces as well as transmission and backscattering events in insulating barriers between the electrodes. Current-voltage characteristics of such devices exhibit a rich diversity of anomalous (from the viewpoint of the standard theory) features, in particular shift of differential-conductance maxima at gap voltages to lower positions and appearance of well-defined dips instead expected coherence peaks. We compare our results with related experimental data.
authors: Donetsk Institute for Physics and Engineering, National Academy of Sciences of Ukraine, 03039, Kyiv, Ukraine.
authors: E
authors: E
authors: Zhitlukhina
authors: Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991, Moscow, Russia.|Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Moscow region, Russia.
authors: I
authors: I
authors: Devyatov
authors: Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, 07743, Jena, Germany.
authors: O
authors: O
authors: Egorov
authors: Institute for Metal Physics, National Academy of Sciences of Ukraine, 03680, Kyiv, Ukraine. belogolovskii@ukr.net.
authors: M
authors: M
authors: Belogolovskii
authors: Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, 07743, Jena, Germany.
authors: P
authors: P
authors: Seidel
keywords: Anomalous features; Charge transport; Nanoscale degraded sheath; Superconducting heterostructures