Quantitative measurements of the thermal resistance of Andreev interferometers

Details Quantitative measurements of the thermal resistance of Andreev interferometers Quantitative measurements of the thermal resistance of Andreev interferometers

2005-01-20

arxiv.org/abs/cond-mat/0501478v1

PRB (Rapid) 72, 020502(R) (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.72.020502

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.

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