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Effect of LaAlO3 twin-domain topology on local dc and microwave properties of cuprate films

Source: J. Appl. Phys. 108, 033920 (2010); doi:10.1063/1.3467003

Published 13 August 2010

KEYWORDS and PACS
Keywords
PACS
  • 74.72.-h
    Cuprate superconductors
  • 74.78.-w
    Superconducting films and low-dimensional structures
  • 84.40.Az
    Waveguides, transmission lines, striplines
  • 74.25.Sv
    Critical currents in superconductors
  • 74.25.F-
    Transport properties
  • YEAR: 2010
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A. P. Zhuravel,1 Steven M. Anlage,2 Stephen K. Remillard,3 A. V. Lukashenko,4,5 and A. V. Ustinov4,5
1B. Verkin Institute for Low Temperature Physics & Engineering, NAS of Ukraine, Kharkov 61103, Ukraine
2Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742-4111, USA
3Department of Physics, Hope College, 27 Graves Place, Holland, Michigan 49423, USA
4Physikalisches Institut, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany
5DFG-Center for Functional Nanostructures (CFN), D-76128 Karlsruhe, Germany
Different imaging modes of low temperature laser scanning microscopy (LTLSM) have been applied to probe local optical and superconducting properties, as well as the spatial variations in thermoelectric and electronic (both dc and rf) transport, in a YBa2Cu3O6.95/LaAlO3 (YBCO/LAO) superconducting microstrip resonator with micron-range resolution. Additionally, the local sources of microwave nonlinearity (NL) were mapped in two-dimensions simultaneously by using the LTLSM in two-tone rf intermodulation distortion contrast mode as a function of (x,y) position of the laser beam perturbation on the sample. The influence of the direction of individual twin-domain YBCO blocks on its NL properties was analyzed in detail. The result shows the direct spatial correlation between NL microwave and dc electronic transport properties of the YBCO film that are imposed by the underlying twin-domain topology of the LAO substrate. In these circumstances, the scale of local NL current densities JIM(x,y) in different areas of the YBCO microstrip quantitatively coincide with the scale of local critical current densities Jc(x,y) measured at the same positions. ©2010 American Institute of Physics
History: Received 30 April 2010; accepted 24 June 2010; published 13 August 2010
Permalink: http://link.aip.org/link/?JAPIAU/108/033920/1

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