Erasable photoinduced change of carrier density and coherence lengths in oxygen-deficient YBa2Cu3Ox



W. Göba,b, W. Langb,a, W. Markowitscha,b, V. Schlosserb,a, W. Kulab,c, R. Soblewskib,c

  1. Ludwig Boltzmann Institut für Festkörperphysik, Kopernikusgasse 15, A-1060, Wien, Austria

  2. Institut für Festkörperphysik der Universität Wien, Austria

  3. Department of Electrical Engineering and Laboratory for Laser Energetics, University of Rochester, NY




ABSTRACT: We report on the persistent and erasable photoinduced change of normal-state transport and superconducting properties of oxygen-deficient YBa2Cu3O6.6 thin films. After illumination with white light for several hours at 150K, a decrease of the electrical resistivity, an increase of the number of mobile holes, and a change of the magnetoresistance caused by superconducting order-parameter fluctuations, were observed. From the latter measurement, we find a photoinduced enhancement of the superconducting coherence lengths in both in-plane and out-of-plane directions.

Keywords: A. high-Tc superconductors; D. galvanomagnetic effects; D. photoconductivity

DOI: 10.1016/0038-1098(95)00504-8

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