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Multiple Andreev reflection in MgB[sub 2]/MgO/MgB[sub 2] Josephson junctions

by: Ke Chen, Daniel Cunnane, Yi Shen, X. X. Xi, Alan W. Kleinsasser, John M. Rowell
Applied Physics Letters, Vol. 100, No. 12. (2012), 122601, doi:10.1063/1.3695159  Key: citeulike:11195382

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Abstract

The current-voltage and conductance-voltage characteristics of MgB2/MgO/MgB2 junctions made with MgB2 electrodes grown by hybrid physical-chemical vapor deposition were systematically analyzed. In the junctions with different sizes and critical current densities, we found excess current and subharmonic gap structure indicative of multiple Andreev reflection. An apparent link between multiple Andreev reflection and substantial Josephson current at high temperatures suggests that the barrier is dominated by high-transparency channels.


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