Oriented thin films of YBaCu(F)O with high T c and J c prepared by electron beam multilayer evaporation
- 17 April 1989
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 54 (16) , 1573-1575
- https://doi.org/10.1063/1.101317
Abstract
Thin films of YBaCu(F)O were deposited on SrTiO3(100) substrates by multilayer deposition from three electron guns containing Y, BaF2, and Cu under a pressure of 5×10−5 Torr of O2. The films were later annealed in a separate chamber under a flowing O2‐H2O atmosphere. X‐ray diffraction studies reveal that the resulting structure is highly oriented with the a axis perpendicular to the substrate. Scanning electron micrographs show a morphology consisting of an array of orthogonal, interconnecting bars with well‐developed junctions. High‐resolution electron microscopy and electron diffraction patterns show that these junctions are atomically abrupt and that the associated c axes are mutually perpendicular. These epitaxial films show a sharp resistive transition with Tc(R=0) as high as 90 K. The zero field critical current density, determined from magnetization measurements, is 2.9×106 A/cm2 at 4.2 K and 5.0×104 A/cm2 at 77 K.Keywords
This publication has 14 references indexed in Scilit:
- The microstructure and superconductivity of YBa2Cu3O7-xrapidly solidified by a pulse laserSuperconductor Science and Technology, 1988
- Preparation of high T c and J c films of Ba2YCu3O7 using laser evaporation of a composite target containing BaF2Applied Physics Letters, 1988
- Role of added fluorine to enhance the electromagnetic properties of superconducting Y-Ba-Cu-O compoundsApplied Physics Letters, 1988
- Y-Ba-Cu-O superconducting thin films by simultaneous or sequential evaporationApplied Physics Letters, 1988
- Thin-film synthesis of the high-Tc oxide superconductor YBa2Cu3O7 by electron-beam codepositionJournal of Materials Research, 1987
- Reproducible technique for fabrication of thin films of high transition temperature superconductorsApplied Physics Letters, 1987
- Preparation of Y-Ba-Cu-O thin films on MgO by dc magnetron sputtering from a stoichiometric Y1Ba2Cu3O7−δ targetApplied Physics Letters, 1987
- Preparation of superconducting YBa2Cu3Ox thin films by oxygen annealing of multilayer metal filmsApplied Physics Letters, 1987
- Critical current densities and transport in superconducting YBa2Cu3O7−δ films made by electron beam coevaporationApplied Physics Letters, 1987
- Critical-current measurements in epitaxial films of compoundPhysical Review Letters, 1987