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Münster 1997 – scientific programme

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TT: Tiefe Temperaturen

TT 6: Postersitzung I: Mesoskopie(1-21), amorphe Metalle und Defektsysteme(22-29), Kryotechnik, Kernmagnetismus(30-37), festes N2(38), Quantenflüssigkeiten und -kristalle(39-48), dünne supraleitende Filme(49-68), schwere Fermionen und Kondosysteme(69-92), Fullerene(93-94)

TT 6.59: Poster

Tuesday, March 18, 1997, 09:30–13:00, Z1

Critical currents and Micro-structure in epitaxial YBa2Cu3O7−δ thin films — •J.C. Martínez1, B. Dam2, B. Stäuble-Pümpin2, G. Doornbos2, R. Surdeanu2, U. Poppe3, and R. Griessen21Institut für Physik, Johannes Gutenberg Universität, 55099 Mainz — 2Physics Department, Vrije Universiteit - Amsterdam, 1081 HV Amsterdam, The Netherlands — 3Institut für Festkörperforschung, Forschungszentrum Jülich,D-52425 Jülich, Germany

Epitaxial YBa2Cu3O7−δ films nucleate in single-crystalline c-axis oriented islands. In the Island boundaries we observe Anti-phase boundaries which correspond to a mismatch between the CuO2 superconducting blocks of one third of the c-axis lattice parameter of YBa2Cu3O7−δ (Y:123). The density of island boundaries can be measured by a careful analysis of the surface morphology using Atomic Force Microscopy (AFM) and Scanning Tunnelling Microscopy (STM). In this work we make a systematic study of the low temperature superconducting current densities Js for different, Y:123 thin films. The magnetic field dependencies of the superconducting currents Js are deduced from the hysteresis loops measured by torque magnetometry at T = 10 K. A comparative study of the magnetic properties with the micro-structure reveals that the island boundaries are strong candidates for being the pinning centres responsible for the large critical currents observed in our Laser Ablated and Sputtered thin films.

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