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Enhanced current flow through meandering grain boundaries in YBa2Cu3O7−delta films

Appl. Phys. Lett. 90, 212501 (2007); doi:10.1063/1.2740610

Published 21 May 2007

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Rafael B. Dinner, Kathryn A. Moler, and M. R. Beasley
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305

D. Matthew Feldmann
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
In YBa2Cu3O7−delta (YBCO) coated conductors grown by metal organic deposition, in-plane meandering of grain boundaries (GBs) has been linked to higher critical current density. The authors investigate this link in individual GBs using transport measurements and scanning Hall probe microscopy with current reconstruction. They observe current-induced flux entry into a coated conductor, then model its behavior by imaging YBCO films with single, straight GBs tilted at various angles to the applied current. They find a strong dependence of critical current on angle, sufficient to explain the enhancement observed for meandering GBs. ©2007 American Institute of Physics
History: Received 24 January 2007; accepted 25 April 2007; published 21 May 2007
Permalink: http://link.aip.org/link/?APPLAB/90/212501/1
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KEYWORDS and PACS

Keywords
PACS
  • 74.78.Bz
    High-Tc superconducting films
  • 74.72.Bk
    Y-based cuprates (HTSC)
  • 74.25.Sv
    Critical currents in superconductors
  • 74.25.Fy
    Transport properties of superconductors including electric and thermal conductivity, thermoelectric effects, etc
  • YEAR: 2007

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (13)
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