Interplay between artificially induced and intrinsic anisotropies in 123 superconducting superlattices

Jose Luis Vicent; E. M. Gonzalez; J. I. Martin; M. Velez

doi:10.1117/12.332440

9 December 1998 Interplay between artificially induced and intrinsic anisotropies in 123 superconducting superlattices

Jose Luis Vicent, E. M. Gonzalez, J. I. Martin, M. Velez

Proceedings Volume 3480, Superconducting Superlattices II: Native and Artificial; (1998) https://doi.org/10.1117/12.332440
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

We report on the behavior of 123 superconducting superlattices grown on cubic substrates, with the CuO₂ planes perpendicular to the substrate. These multilayers are the ideal system to study the competition between the intrinsic anisotropy, due to the natural anisotropy and the artificially induced anisotropy. The samples are grown by DC magnetron sputtering technique. The superlattices are characterized by the refinement of the structure from x-ray diffraction spectra. The angular dependence of the resistivity and critical current, in the mixed state, are used to study the anisotropy of this system. Two different regimes have been observed, with a crossover from one to another driven by the direction of the applied magnetic field. One of them occurs with the applied magnetic field close to the CuO₂ planes and another with the applied magnetic field close to the substrate. In the former regime, the anisotropy behavior could not be explained taking into account only the intrinsic pinning mechanisms, In this regime,the critical current and the resistivity follow scaling laws, using reduced magnetic field, due to the H_c2 2D and 3D anisotropy models. In the latter regimen, the insulating layers act as strong pinning centers and a break- down of the H_c2 scaling laws is observed.

Citation Download Citation

Jose Luis Vicent, E. M. Gonzalez, J. I. Martin, and M. Velez "Interplay between artificially induced and intrinsic anisotropies in 123 superconducting superlattices", Proc. SPIE 3480, Superconducting Superlattices II: Native and Artificial, (9 December 1998); https://doi.org/10.1117/12.332440

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