Quantitative measurements of the thermal resistance of Andreev interferometers

Abstract

Using a local thermometry technique, we have been able to quantitatively measure the thermal resistance $R^T$ of diffusive Andreev interferometers. We find that $R^T$ is strongly enhanced from its normal state value at low temperatures, and behaves non-linearly as a function of the thermal current through the sample. We also find that the $R^T$ oscillates as a function of magnetic flux with a fundamental period corresponding to one flux quantum ${\Phi }_0=h/2e$, demonstrating the phase coherent nature of thermal transport in these devices. The magnitude of $R^T$ is larger than predicted by recent numerical simulations.

arXiv comment5 pages, 4 figures

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• Coherent Charge Transport in Metallic Proximity Structures
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• Kinetic equation approach to diffusive superconducting hybrid devices
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• Thermal conductance of Andreev interferometers
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• reentrance effect in normal-metal/superconducting hybrid loops
• Local thermometry technique based on proximity-coupled superconductor/normal-metal/superconductor devices

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• Controlling the Sign of Magnetoconductance in Andreev Quantum Dots
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• Influence of Supercurrents on Low-Temperature Thermopower in Mesoscopic N/S Structures
• Thermopower Oscillation Symmetries in a Double-Loop Andreev Interferrometer
• Spontaneous symmetry breaking-induced thermospin effect in superconducting tunnel junctions
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• Optimized proximity thermometer for ultrasensitive detection: Role of an ohmic electromagnetic environment