Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 17: Superconductivity: Thin Film Preparation
TT 17.3: Vortrag
Dienstag, 28. März 2006, 14:30–14:45, HSZ 02
YBa2Cu3O7−δ Thin Films Prepared by Polymer-Assisted Deposition (PAD) — •Claudia Apetrii1, Heike Schlörb1, Irene von Lampe2, Ludwig Schultz1, and Bernhard Holzapfel1 — 1IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — 2TU Berlin, Englische Str. 20, 10587 Berlin, Germany
The Polymer-Assisted Deposition (PAD) route is a deposition route towards an inexpensive, non-vacuum approach for growing long YBa2Cu3O7−δ (YBCO) tapes. The polymer used in this technique is a synthetic organic polymer (polyacrylic acid) that has functional groups with strong complexation affinities for metal ions. The distribution of the metal ions is very homogeneous and, thus, processing times are shorter, leading to good continuous film preparation conditions. The metal polymer precursor films were produced by spin coating a stoichiometric solution (Y:Ba:Cu = 1:2:3) onto SrTiO3 single crystal substrates and subsequently dried at 170 ∘C in air. The heat treatment was performed in a tube furnace at reaction temperature of 775 ∘C in a nitrogen atmosphere containing small amounts of oxygen. The quality of the films strongly depends on the precursor solution stability. Furthermore, the effect of metal ions (Sm, Dy) introduced by chemical substitution on the Y site is discussed. The YBCO films were routinely analysed by X-ray Diffraction and Scanning Electron Microscopy. The inductively measured critical current density Jc reached values up to 3.5 x 106 A/cm2 (at 77 K).