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Tailored thin films of a superconducting Bi‐Sr‐Ca‐Cu oxide prepared by incorporation of exotic atoms—control of the distance between CuO2 layers

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4 Author(s)
Tabata, Hitoshi ; Technical Institute, Kawasaki Heavy Industries Ltd., Kawasakicho, Akashi, Hyogo 673, Japan ; Murata, Osamu ; Kawai, T. ; Kawai, Shichio

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A layer‐by‐layer successive deposition method utilizing laser ablation has been applied to the site‐selective incorporation of +1, +2, and +3 ions at the Ca and Sr site of Bi2Sr2Ca1Cu2O8 superconducting films. The replacement of Ca by larger ions increases the lattice parameter c and Tc simultaneously, while the replacement of Sr does not. These changes are explained by structure models of Bi2Sr2Ca1Cu2O8, and the correlation between Tc and the lattice parameter c is explained on the basis of the distance between CuO2 layers, indicating the importance of the interaction among CuO2 layers.

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Applied Physics Letters  (Volume:56 ,  Issue: 16 )