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00925njm 22002777a 4500 dc González Herrera, Elvira María author González Casado, J.M. author Vicent López, José Luis author 2000-10-01 a-axis oriented (CuO_2 planes perpendicular to the substrate) films and superlattices grown on cubic substrates show a structure with 90° microdomains. The microdomains are grains with a 90° rotation of the c axis. In the vortex liquid region, this microstructure induces a change from the usual three-dimensional (3D) behavior of the anisotropy toward a 2D behavior, in a temperature range above the usual crossover from 2D to 3D. Moreover, when the thickness of the superconducting part of the multilayers becomes smaller (or of the same order as) than the microdomain size the 3D dimensional anisotropy behavior is recovered. 1098-0121 10.1103/PhysRevB.62.8707 https://hdl.handle.net/20.500.14352/60178 http://dx.doi.org/10.1103/PhysRevB.62.8707 https://journals.aps.org Interplay between the vortex phase coherence and extended disorder defects in the vortex-liquid regime of thin films and superlattices of 123 superconductors