Structural and superconducting properties of orientation-ordered Y sub 1 Ba sub 2 Cu sub 3 O sub (7-x) films prepared by molecular beam epitaxy.

Superconducting Y sub 1 Ba sub 2 Cu sub 3 O sub (1-x) films were produced by metal molecular beam epitaxy with one e-beam and two thermal cells and a molecular oxygen gas source. The films are epitaxially grown on SrTiO sub 3 (100) with an orientation of a axis perpendicular to the plane, and b and c axes are ordered in the plane. Sharp resistive superconducting transition with T sub c (R = 0) at 82K was obtained. An average J sub c in the plane is 10 sup 3 A/cm sup 2 at 77K, 5 x 10 sup 4 A/cm sup 2 at 70K, and 10 sup 6 A/cm sup 2 at 4.2K. PACS Number: 74.70.Ya, 74.60.Jg, 73.60.Ka