Superconductivity in BiSrCaCuO Superlattices: Two-Dimensional Properties of CuO Planes

1 December 1991

journal article
Published by IOP Publishing in Japanese Journal of Applied Physics

Vol. 30 (12S)
https://doi.org/10.1143/jjap.30.3929

Abstract

We report resistive measurements on epitaxial superlattices consisting of alternating Bi₂Sr₂CaCu₂O₈ (2212) and Bi₂Sr₂CuO₆ (2201) layers grown by atomic-layer-by-layer molecular beam epitaxy (MBE) using oxygen radical beams. The influence of interplane coupling between Cu-O planes was studied by varying the superlattice sequence of different c-axis half-unit cells. A single-half-unit-cell-thick 2212 layer was found to be superconducting in a 2201 matrix, independent of the conductivity and the thickness of neighboring 2201 layers. The fact that all of our superlattices showed superconductivity essentially equal to that of a 2212 single-phase film suggests that this cuprate is a two-dimensional superconductor due to its Cu-O double planes.

Keywords

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