J. Phys. IV France 09 (1999) Pr8-307-Pr8-311
Structured YBa2Cu3O7-δ thin films grown on aligned calcium stabilized zirconia-calcium zirconate lamellar eutectic substratesJ. Santiso1, L.A. Angurel2, V. Laukhin1, 3, R.I. Merino2, M. Doudkowsky1, G. Garcia1, A. Figueras1, J.I. Peña2, M.L. Sanjuán2 and V.M. Orera2
1 Institut de Ciència de Materials de Barcelona, Consejo Superior de Investigaciones Cientificas, ICMAB-CSIC, Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
2 Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, Fac. Ciencias, Univ. de Zaragoza, Pza San Francisco s/n, 50009 Zaragoza, Spain
3 Institute of Problems of Chemical Physics, RAS, Chernogolovka MD 142432, Russia.
In this paper we present a new approach to obtain structured biepitaxial films by using eutectic substrates. In particular we have deposited YBa2Cu3O7-δ (YBCO) thin films grown by Metal-Organic Chemical Vapor Deposition (MOCVD) on eutectic Ca-stabilized Zirconia - CaZrO3 (CSZ-CZO) substrates structured in the form of parallel lamellae. The films reproduce the pattern of the substrate and show ordered arrays of alternating c-axis and (103)-oriented YBCO strips. Crystallographic characterisation reveals that YBCO films grow epitaxially on both eutectic phases. The structured films were analysed by EPMA, and micro-Raman. The films show anisotropic transport properties in both normal (resistivity anisotropy ρT/ρL (300K) ≈ 1.9) and superconducting states (critical current anisotropy at 77K JcL/JcT ≈ 13) when measured along (L) or transverse (T) to the substrate lamellae. Transport along transverse direction showed a considerably higher sensitivity to applied magnetic field than measurements in the longitudinal direction. This was attributed to the weak-link behaviour of the artificially-induced grain boundaries between strips.
© EDP Sciences 1999