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Title: Detection and imaging of the oxygen deficiency in single crystalline YBa{sub 2}Cu{sub 3}O{sub 7−δ} thin films using a scanning positron beam

Single crystalline YBa{sub 2}Cu{sub 3}O{sub 7−δ} (YBCO) thin films were grown by pulsed laser deposition in order to probe the oxygen deficiency δ using a mono-energetic positron beam. The sample set covered a large range of δ (0.191 < δ < 0.791) yielding a variation of the critical temperature T{sub c} between 25 and 90 K. We found a linear correlation between the Doppler broadening of the positron electron annihilation line and δ determined by X-ray diffraction. Ab-initio calculations have been performed in order to exclude the presence of Y vacancies and to ensure the negligible influence of potentially present Ba or Cu vacancies to the found correlation. Moreover, scanning with the positron beam allowed us to analyze the spatial variation of δ, which was found to fluctuate with a standard deviation of up to 0.079(5) within a single YBCO film.
Authors:
; ;  [1] ; ;  [2]
  1. Lehrstuhl E21 at Physics Department and FRM II at Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, James-Franck Straße, 85748 Garching (Germany)
  2. Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, Universitätsstraße 1, 86135 Augsburg (Germany)
Publication Date:
OSTI Identifier:
22395755
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM OXIDES; COPPER OXIDES; CORRELATIONS; CRITICAL TEMPERATURE; DOPPLER BROADENING; ENERGY BEAM DEPOSITION; HIGH-TC SUPERCONDUCTORS; LASER RADIATION; MONOCRYSTALS; OXYGEN; POSITRON BEAMS; PULSED IRRADIATION; SUPERCONDUCTING FILMS; THIN FILMS; VACANCIES; X-RAY DIFFRACTION; YTTRIUM OXIDES