ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Thin superconducting films of YBa2Cu3O7−x were deposited onto (100) SrTiO3 substrates at 750 °C in 100 and 200 mTorr of O2, by ArF excimer laser ablation. The as-deposited films were strongly oriented with the c axis perpendicular to the surface when they were cooled to room temperature in oxygen. The highest values of transport critical current density (Jc(approximately-greater-than)105 A/cm2 below 80 K) were observed in films cooled in flowing O2. We find that, in all films, Jc follows a power law (1−T/Tc)n with n≈2, near the critical temperature, Tc, when Tc is defined as the temperature at which Jc=0. It appears that this behavior is governed by the short coherence lengths in this high-Tc material, as suggested by G. Deutscher and K. A. Müller [Phys. Rev. Lett. 59, 1745 (1987)], and not by the specific nature of the large-scale structure of the films.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.346301
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