Fabrication and characteristics of weak links between â- and ĉ-axis normal grains of Y1Ba2Cu3O7−x

Journal of Materials Research - Tập 11 - Trang 1086-1093 - 2011
S. Mahajan1, D. B. Buchholz1, J. Lei1, R. P. H. Chang1, T. Hogan2, C. R. Kannewurf2, S. N. Song3, J. B. Ketterson3, B. Hinds4, T. J. Marks4, J. Eckstein5
1Department of Material Science and Engineering, Science and Technology Center for Superconductivity, Northwestern University, Evanston, USA
2Department of Electrical Engineering and Computer Science, Science and Technology Center for Superconductivity, Evanston, USA
3Department of Physics and Astronomy, Northwestern University, Evanston, USA
4Department of Chemistry, Science and Technology Center for Superconductivity, Northwestern University, Evanston, USA
5Varian Associates, Palo Alto, USA

Tóm tắt

We have used pulsed organometallic beam epitaxy (POMBE) to simultaneously deposit â- and ĉ-axis oriented Y1Ba2Cu3O7−x (YBCO) thin films at arbitrary locations on LaAlO3(100) substrates. Using photolithography and ion milling, several types of â-ĉ weak links have been fabricated at the boundary between the two films. The current-voltage (I-V) characteristics show a flux flow type behavior. The resistive transitions are broad and the critical current density is low, indicating weak coupling across these boundaries. With magnetic field applied parallel to the grain boundary plane, nonhysteretic I-V curves are obtained and the critical current goes to zero at an applied magnetic field of ∼7500 G.

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Journal of Materials Research

Tập 11

1086-1093

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