https://doi.org/10.1007/s100510070052
Photo-induced increase of the superconducting coherence lengths in oxygen-deficient YBa2Cu3Ox thin films
1
Institut für Materialphysik der Universität Wien,
Kopernikusgasse 15, 1060 Wien, Austria
2
Department of Electrical and Computer
Engineering and Laboratory for Laser Energetics, University of
Rochester, Rochester, NY 14627-023, USA
3
Angewandte Physik, Johannes-Kepler-Universität Linz, 4040 Linz, Austria
Received:
15
December
1999
Revised:
24
May
2000
Published online: 15 November 2000
YBa2Cu3Ox () thin films were photodoped with white light at
various temperatures from 70 K to 290 K. Before and after the
excitation, the magnetoconductivity was measured in a magnetic field B
= 0.5 T, and the experimental results were fitted to the Aslamazov-Larkin
theory of superconducting order-parameter fluctuations to determine the
superconducting coherence lengths,
and
. We observed
that the photodoping process enhanced
and
and that the amount
increased with the photodoping temperature increase. On the other hand, the superconducting
anisotropy
/
decreased with increasing temperature. The photodoping effect enhances
superconducting properties of partially oxygen-deficient YBa2Cu3Oxsamples and is considerably
increased by high doping temperatures.
PACS: 73.50.Jt – Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects) / 73.50.Pz – Photoconduction and photovoltaic effects / 74.40 +k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000