High-quality YBa₂Cu₃Ox films prepared in air using pulsed-laser deposition

H. Jiang
A. J. Drehman
R. J. Andrews
J. A. Horrigan
C. Vittoria, Northeastern University

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Originally published in Applied Physics Letters 65, 3132 (1994). DOI:10.1063/1.113027 (http://dx.doi.org/10.1063/1.113027).

Abstract

High quality YBa₂Cu₃Oₓ superconducting films have been deposited by laser deposition on yttrium stabilized cubic zirconia (YSZ) substrates using a partial pressure of air instead of oxygen. The T_c of these films was over 2° higher than films made in the same deposition system using oxygen. X-ray diffraction indicated that the films were oriented with the c axis normal to the substrate surface. The critical current densities of the films were on the order of 10⁶ A/cm² at 77 K and self-magnetic field, and the room-temperature resistivities were about 245 µὩ cm. A unique aspect of these films was that the normal state resistivities showed nonlinear behavior with respect to temperatures. No secondary phase was detected by x-ray diffraction and SQUID magnetometry.