Issue |
Europhys. Lett.
Volume 57, Number 4, February 2002
|
|
---|---|---|
Page(s) | 564 - 570 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and opticalproperties | |
DOI | https://doi.org/10.1209/epl/i2002-00499-9 | |
Published online | 01 September 2002 |
Quantitative measurements of the thermopower of Andreev interferometers
Department of Physics and Astronomy, Northwestern University
Evanston, IL 60208, USA
Received:
30
July
2001
Accepted:
20
November
2001
Using a new second-derivative technique and local thermometers in a
mesoscopic metallic
sample, we have obtained for the first time quantitative measurements
of the low-field
and temperature-dependent thermopower of Andreev interferometers.
These Andreev
interferometers are shorter in length and of a different topology
than those measured by
Eom et al. The thermopower is found to be an antisymmetric
periodic function
of the field. The temperature dependence of the thermopower is
nonmonotonic, with a
minimum at a temperature of K, and the measured amplitude
is much smaller than
that estimated previously. These results are discussed from the
perspective of Andreev
reflection at the normal-metal/superconductor interface.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.80.Fp – Point contacts; SN and SNS junctions
© EDP Sciences, 2002
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