Superconducting YBa2Cu3O7-δ thin films with three different orientations

X. K. Wang*, D. X. Li, D. Q. Li, Y. P. Lu, S. N. Song, Y. H. Shen, J. Q. Zheng, R. P.H. Chang, J. B. Ketterson, J. M. Chabala, D. Hansley, R. Levi-Setti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Epitaxial thin films of YBaCuO have been prepared with (1) the a axis perpendicular to (100) SrTiO3; (2) the c axis perpendicular to (100) SrTiO3; and (3) the [110] axis perpendicular to (110) SrTiO 3. Films were fabricated using a multilayer deposition technique involving three electron guns containing Y, BaF2, and Cu under a pressure of 5×10-5 Torr of O2. As deposited films, which contained polycrystalline and amorphous regions, were later annealed in a furnace under a flowing O2-H2 O atmosphere. X-ray diffraction patterns as well as scanning electron microscopy and high-resolution electron microscopy images confirm that the films are highly oriented, essentially epitaxial. The a-axis oriented film exhibits zero resistance at 90 K and a critical current density of 2.9×106 A/cm2 at 4.2 K while the c-axis oriented film exhibits a T c of 88 K and a Jc of 0.9×107 A/cm 2 at 4.2K; the Jc values were determined magnetically. The [110]-orientation film shows the sharpest transition with a transition width of 1 K and zero resistance at 85 K.

Original languageEnglish (US)
Pages (from-to)4217-4220
Number of pages4
JournalJournal of Applied Physics
Volume67
Issue number9
DOIs
StatePublished - Dec 1 1990

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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