Nb-NbOx-PbIn tunnel junctions with ultra-thin niobium electrodes

Dettmann, F.; Pertsch, P.

doi:10.1002/pssa.2210520145

Cited by 9 publications

(8 citation statements)

References 5 publications

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“…With rising temperature the knee structure gets smaller and smaller and sometimes even disappears. This temperature dependence cannot be regarded as a simple temperature smearing [3,6]. Experiments by Dettmann and Pertsch [6] on ultra-thin niobium electrodes show a decrease of the knee structure for thinner electrodes.…”

Section: Theoretical Current-voltage Characteristicsmentioning

confidence: 93%

“…Experiments by Dettmann and Pertsch [6] on ultra-thin niobium electrodes show a decrease of the knee structure for thinner electrodes. They also report a change in the slope of the I-U characteristics a t low voltages near difference gap and a lowering of the niobium gap energy obtained from the characteristic a t the sum gap.…”

Section: Theoretical Current-voltage Characteristicsmentioning

confidence: 96%

“…With rising temperature the knee structure gets smaller and smaller and sometimes even disappears. This temperature dependence cannot be regarded as a simple temperature smearing [3,6].…”

Section: Theoretical Current-voltage Characteristicsmentioning

confidence: 97%

“…The actual parameters have to be determined by experimental curves and observed tendencies. Therefore, we adapt the parameters in the given example to the experimental data of Dettmann and Pertsch [6]. We choose A;'' = 1.45 meV, TeS = 8.7 K, A% = 1.09 meV, T c~ = 6.6 K for the proximity-effect model and A, = 1.38 meV, Tc2 = 7.2 K and 8A,/A, = 0.056 for the lead counter electrode.…”

Section: Theoretical Current-voltage Characteristicsmentioning

confidence: 99%

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Theoretical Investigation of the Current–Voltage Characteristics of Superconducting Niobium–Lead Tunnel Junctions

Seidel

Richter

1980

Physica Status Solidi (b)

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A proximity-effect model for the niobium electrode is presented assuming on the barrier side the existence of a thin surface layer which differs from the other part of the niobium electrode. The resulting dependence of the quasiparticle current-voltage characteristic on temperature and electrode thickness shows good agreement with experimental results.Unter der Annahme einer Oberfliichenschicht auf der Niobelektrode, die sich vom darunterliegenden Material unterscheidet, wird ein Proximityeffekt-Mode11 zur Beschreibung der Niobelektrode vorgestellt. Die damit erhaltenen Abhangigkeiten der Quasiteilchen-Strom-Spannungskennlinie von der Temperatur und der Elektrodendicke stimmen gut mit experimentellen Ergebnissen uberein.

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Section: Theoretical Current-voltage Characteristicsmentioning

confidence: 93%

Section: Theoretical Current-voltage Characteristicsmentioning

confidence: 96%

“…With rising temperature the knee structure gets smaller and smaller and sometimes even disappears. This temperature dependence cannot be regarded as a simple temperature smearing [3,6].…”

Section: Theoretical Current-voltage Characteristicsmentioning

confidence: 97%

Section: Theoretical Current-voltage Characteristicsmentioning

confidence: 99%

See 2 more Smart Citations

Theoretical Investigation of the Current–Voltage Characteristics of Superconducting Niobium–Lead Tunnel Junctions

Seidel

Richter

1980

Physica Status Solidi (b)

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“…Moreover, the current values at very low temperatures and at voltages lower than the sum of V Δ were considerably larger than theoretically anticipated for the BCS densities of states [ 6 ]. Later, it was shown experimentally that this anomaly may be caused by the presence of a normal conducting layer on the superconducting niobium film [ 6 , 7 ]. This statement was confirmed theoretically [ 8 ] in the framework of the proximity-effect model which treats incoherent single-particle scatterings from a normal layer to a superconducting one within a tunnel-barrier approximation [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Anomalous Inner-Gap Structure in Transport Characteristics of Superconducting Junctions with Degraded Interfaces

Zhitlukhina¹,

Devyatov²,

Egorov³

et al. 2016

Nanoscale Res Lett

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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.

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Tunneling into Proximity Electrodes with Magnetic Impurities

Meyer

Seidel

1982

Physica Status Solidi (b)

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Starting from a model of classical spins a proximity electrode with magnetic impurities in the barrier-near layer is investigated theoretically. The rising differences to the common McMillan tunneling model (MTM), especially, the impurity band in the former gap region of the density of states provide significant changes in the tunneling properties of such a electrode, for example, in all current amplitudes of the Werthamer theory. Detailed investigations of the current-voltage characteristic for tunnel junctions with proximity electrodes containing magnetic impurities show enhanced excess currents below the sum jump which are qualitative similar to experimental results on tunnel structures with electrodes of Nb or V.Ausgehend vom Modell klassischer Spins wird eine Proximityelektrode theoretisch untersucht, deren barrierennahe Schicht magnetische Verunreinigungen enthiilt. Die dabei entstehenden Unterschiede zum McMillan-Tunnelmodell (MTM), insbesondere das Verunreinigungsband im vormaligen Luckenbereich der Zustandsdichte, bewirken deutliche Yeranderungen in den Tunneleigenschaften einer derartigen Elektrode, so beispielsweise in allen Stromamplituden der Werthamer-Theorie. Detaillierte Untersuchungen der Strom-Spannungs-Charakteristik von Tunnelverbindungen mit magnetisch verunreinigten Proximityekktroden zeigen vergrooerte UberschuDstrome unterhalb des Summenanstieges, die qualitative Ahnlichkeit zu experimentellen Beobachtungen an Tunnelelementen mit Nb-oder V-Elektroden aufweisen.

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Nb-NbOx-PbIn tunnel junctions with ultra-thin niobium electrodes

Cited by 9 publications

References 5 publications

Theoretical Investigation of the Current–Voltage Characteristics of Superconducting Niobium–Lead Tunnel Junctions

Theoretical Investigation of the Current–Voltage Characteristics of Superconducting Niobium–Lead Tunnel Junctions

Anomalous Inner-Gap Structure in Transport Characteristics of Superconducting Junctions with Degraded Interfaces

Tunneling into Proximity Electrodes with Magnetic Impurities

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