Superconducting thallium oxide films by the electrodeposition method

A low cost electrodeposition method is tested for the fabricating high-temperature superconducting wire or tape. Recent studies on the development of biaxially textured electrodeposited (ED) films on Ag-coated, single-crystal substrates are reported, pole-figure measurements of electrodeposited (Tl)-Ba-Ca-Cu-O and (TI, Bi)-(Sr, Ba)-Ca-Cu-Ag-O films on 300 Angstrom Ag/LaAlO3, with thickness between 1 and 5 mu m, clearly show strong biaxial texturing. The omega scan and phi scan of (TlBi)(0.9)Sr1.6Ba0.4Ca2Cu3Ag0.2Ox indicate the full width half maximum (FWHM) of only 0.9 degrees and 1.2 degrees, respectively, which indicate a very high-quality film prepared by electrodeposition process. Transport measurements for the ED films show values of 3 x 10(5) A/cm(2) at 77 K in zero field. Single-layer thallium-oxide films, with Pb, Bi, and Sr substitution, offer the potential for operation at 77 K in practical magnetic fields of 3-5 T. (C) 1998 published by Elsevier Science B.V. All rights reserved.