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Andreev reflection and enhanced subgap conductance in NbN/Au/InGaAs-InP junctions

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arxiv cond-mat/0309682 v2 pith:LGKU4BUI submitted 2003-09-29 cond-mat.mes-hall

Andreev reflection and enhanced subgap conductance in NbN/Au/InGaAs-InP junctions

I. E. Batov (1 , 2) , Th. Schaepers (2) , A. A. Golubov (3) , A. V. Ustinov (1) ((1) Physikalisches Institut III , Universitaet Erlangen-Nuernberg , Erlangen , Germany (2) Institut fuer Schichten und Grenzflaechen
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Forschungszentrum Juelich Germany (3) Faculty of Applied Physics University of Twente The Netherlands)
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classification cond-mat.mes-hall
keywords resistancebeendifferentialeffectelectronhighjunctionsmagnetic
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We report on the fabrication of highly transparent superconductor/normal metal/two-dimensional electron gas junctions formed by a superconducting NbN electrode, a thin (10nm) Au interlayer, and a two-dimensional electron gas in a InGaAs/InP heterostructure. High junction transparency has been achieved by exploiting of a newly developed process of Au/NbN evaporation and rapid annealing at 400C. This allowed us to observe for the first time a decrease in the differential resistance with pronounced double-dip structure within the superconducting energy gap in superconductor-2DEG proximity systems. The effect of a magnetic field perpendicular to the plane of the 2DEG on the differential resistance of the interface was studied. It has been found that the reduced subgap resistance remains in high magnetic fields. Zero-field data are analyzed within the previously established quasiclassical model for the proximity effect.

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