Abstract
In this paper we present a new approach to obtain structured biepitaxial films by using eutectic substrates. In particular we have deposited YBa 2 Cu 3 O 7-δ (YBCO) thin films grown by Metal-Organic Chemical Vapor Deposition (MOCVD) on eutectic Ca-stabilized Zirconia - CaZrO 3 (CSZ-CZO) substrates structured in the form of parallel Iamellae 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 ρ T /ρ L (300K) ≃ 1.9 and superconducting states (critical current anisotropy at 77K J c L /J c T ≃ 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.
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