Eur. Phys. J. B 18, 227-231 (2000)
https://doi.org/10.1007/s100510070052

Photo-induced increase of the superconducting coherence lengths in oxygen-deficient YBa₂Cu₃O_x 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

Abstract

YBa₂Cu₃O_x () 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 YBa₂Cu₃O_xsamples and is considerably increased by high doping temperatures.