(Ba,La)CuO2/CaCuO2 superconducting multilayers: Stabilizing effect of La

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Superconducting multilayers, whose growth and structure are determined by the kinetic deposition instead of by thermodynamics, are a powerful tool for investigating high Tc superconductor properties. By means of pulsed laser deposition, we grew ((Ba,La)CuO2+δ)2/(CaCuO2)n superconducting superlattices. Different electrical properties have been observed by increasing La doping in the block layer: in particular, 15%-La substituted samples showed a good metallic behavior in the normal state, underwent a superconducting transition at 70 K and presented a low anisotropy, similar to that of YBCO. © 2002 Elsevier Science B.V. All rights reserved.

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