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Two classes of samples of layered Bi-Ca-Sr-Cu oxides were investigated. The second one was obtained from the first by annealing close to the melting point. All had the same nominal composition 4:3:3:4, but showed a different behaviour from electrical resistivity point of view. The microwave absorption measurements indicated the presence of two superconducting phases, one at 106 K, the other at about 80 K in both classes of samples. The powder X-ray diffraction revealed the presence of the two phases only in the thermal treated samples. X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) measurement indicated that the electronic structure changed from one class to other. A possible theoretical interpretation of our experimental results is based on a quantum percolation model with Coulomb interaction.

Additional information

Authors: GIARDINA M D ET AL, JRC Ispra (IT);GIORI C, Università di Parma (IT);ZOCCHI M ET AL, Università di Brescia (IT);DALLACASA V, Università di Verona (IT)
Bibliographic Reference: Article: Journal of Materials Research
Record Number: 199610031 / Last updated on: 1996-02-16
Original language: en
Available languages: en
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