Preparation of CuBa2Ca3CU4Oy superlattice thin film by self-assembling epitaxy method

We report on the epitaxial growth of 1:2:0:1 type CuBa2CuOy layer, an infin ite layer CaCO2 and their superlattice (1 x 3) by self-assembling epitaxy m ethod, involving rf magnetron sputtering, on (100) SrTiO3 substrate. Excell ent (0 0 1) films of both the CuBa2CuOy and CaCuO2 with c similar to 8.4 an d 3.2 Angstrom, respectively, were obtained. A superlattice with a period o f about 18.5 A which corresponds to the formula CuBa2Ca3Cu4Oy was prepared by growing alternatively the 1:2:0:1 and CaCuO2 at about 500 degreesC in a gas mixture 10-20 mTorr of Ar + N2O. The as-grown superlattice film showed a superconducting diamagnetic signal at about 20 K. (C) 2001 Elsevier Scien ce B.V. All rights reserved.