Issue |
Europhys. Lett.
Volume 73, Number 6, March 2006
|
|
---|---|---|
Page(s) | 948 - 954 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2005-10485-3 | |
Published online | 15 February 2006 |
Dissipation in ultra-thin current-carrying superconducting bridges; evidence for quantum tunneling of Pearl vortices
1
Dipartimento di Ingegneria dell'Informazione Seconda Università di Napoli Aversa (CE), Italy
2
IBM Watson research center - Route 134 Yorktown Heights, NY 10598, USA
3
CNR-INFM Coherentia, Dipartimento di Scienze Fisiche Università di Napoli “Federico II" - Napoli, Italy
4
CNR-INFM Coherentia, Dipartimento di Ingegneria Meccanica Università di Roma Tor Vergata - Roma, Italy
5
Ames Laboratory-DOE and Department of Physics and Astronomy Iowa State University - Ames, IA 50011-3160, USA
Received:
8
November
2005
Accepted:
26
January
2006
We have made zero-field current-voltage (IV) measurements of
artificially layered high-Tc thin-film bridges.
SQUID microscopy of these films
provides Pearl lengths Λ longer than
the bridge widths, and shows current distributions that are
uniform across the bridges. At high temperatures and high currents the
voltages follow the power law ,
with
,
in good
agreement with the predictions for thermally activated vortex motion.
At low temperatures, the IV's
are better fit by
linear in I-2, as
expected if the low-temperature dissipation is dominated by
quantum tunneling of individual Pearl vortices.
PACS: 74.25.Qt – Vortex lattices, flux pinning, flux creep / 74.78.Bz – High-Tc films / 74.78.Fk – Multilayers, superlattices, heterostructures
© EDP Sciences, 2006
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