High-temperature superconductivity in ultrathin films of Y1Ba2Cu3O7-x

Venkatesan, T.; Wu, X. D.; Dutta, B.; Inam, A.; Hegde, M. S.; Hwang, D. M.; Chang, C. C.; Nazar, L.; Wilkens, B.
February 1989
Applied Physics Letters;2/6/1989, Vol. 54 Issue 6, p581
Academic Journal
We have grown ultrathin films of Y1Ba2Cu3O7-x in situ on (001) SrTiO3 by pulsed laser deposition. The zero resistance transition temperature (Tc0) is >90 K for films >300 Å thick. The critical current density (Jc at 77 K) is 0.8×106 A/cm2 for a 300 Å film and 4–5×106 A/cm2 for a 1000 Å film. The Tc0 and Jc deteriorate rapidly below 300 Å, reaching values of 82 K and 300 A/cm2 at 77 K, respectively, for a 100 Å film. Films only 50 Å thick exhibit metallic behavior and possible evidence of superconductivity without showing zero resistance to 10 K. These results are understood on the basis of the defects formed at the film-substrate interface, the density of which rapidly decreases over a thickness of 100 Å. We have studied these defects by ion channeling measurements and cross-section transmission electron microscopy. Our results suggest that the superconducting transport in these films is likely to be two dimensional in nature, consistent with the short coherence length along the c axis of the crystals.


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