✦ LIBER ✦

High critical currents in polycrystalline Tl-Ca-Ba-Cu-O films

✍ Scribed by J.F. Kwak; E.L. Venturini; R.J. Baughman; B. Morosin; D.S. Ginley

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 519 KB
Volume: 29
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(89)90175-6

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✦ Synopsis

We present transport critical current (Jct) data for polycrystalline films in the TI-Ca-Ba-Cu-O system. Comparable results are obtained for unoriented films of TI2CaBa2Cu2Ox and unoriented and epitaxial films of TI2Ca2Ba2Cu3Ox: namely, Jcts over 105 A cm -2 (109 A m -2) at 77 K with weak sensitivity to magnetic field in the film plane. Jct falls more rapidly in fields normal to the film plane. The zero field Jet is quadratic in 1 -T/Tc from 4 K to 95 K.

The hysteresis in magnetization field loops collapses above 1 T at 76 K but not at 5 K. All of these results are consistent with strongly coupled grains and weak flux pinning at grain boundaries. Flux creep does not appear to be significant; if it were, the J~t data would give a lower bound on the potential Jet of these films. Finally, we discuss current-voltage data in terms of spatial non-uniformity in the critical current.

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