Heat transfer coefficient saturation in superconducting Nb tunnel junctions contacted to a NbTiN circuit and an Au energy relaxation layer - Archive ouverte HAL Access content directly
Journal Articles IEEE Transactions on Applied Superconductivity Year : 2015

Heat transfer coefficient saturation in superconducting Nb tunnel junctions contacted to a NbTiN circuit and an Au energy relaxation layer

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Abstract

In this paper we present the experimental realization of a Nb tunnel junction connected to a high-gap superconducting NbTiN embedding circuit. We investigate relaxation of nonequilibrium quasiparticles in a small volume Au layer between the Nb tunnel junction and the NbTiN circuit. We find a saturation in the effective heat-transfer coefficient consistent with a simple theoretical model. This saturation is determined by the thickness of the Au layer. Our findings are important for the design of the ideal Au energy relaxation layer for practical SIS heterodyne mixers and we suggest two geometries, one, using a circular Au layer and, two, using a half-circular Au layer. Our work is concluded with an outlook of our future experiments.
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Dates and versions

cea-01568587 , version 1 (25-07-2017)

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Stefan Selig, Marc Westig, Karl Jacobs, Michael Schultz, Netty Honingh. Heat transfer coefficient saturation in superconducting Nb tunnel junctions contacted to a NbTiN circuit and an Au energy relaxation layer. IEEE Transactions on Applied Superconductivity, 2015, 25 (3), pp.2400705. ⟨10.1109/TASC.2014.2378054⟩. ⟨cea-01568587⟩
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