Quantitative measurements of the thermopower of Andreev interferometers

Details Quantitative measurements of the thermopower of Andreev interferometers Quantitative measurements of the thermopower of Andreev interferometers

2001-07-30

arxiv.org/abs/cond-mat/0107605v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures

Scientific paper

10.1209/epl/i2002-00499-9

Using a new second derivative technique and thermometers which enable us to determine the local electron temperature in a mesoscopic metallic sample, we have obtained quantitative measurements of the low temperature field and temperature dependent thermopower of Andreev interferometers. As in previous experiments, the thermopower is found to oscillate as a function of magnetic field. The temperature dependence of the thermopower is nonmonotonic, with a minimum at a temperature of $\simeq0.5$ K. These results are discussed from the perspective of Andreev reflection at the normal-metal/superconductor interface.

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