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Crystalline Phases and Electronic Structures in Superconducting Bi – Sr – Ca – Cu Oxides

Published online by Cambridge University Press:  31 January 2011

M. D. Giardina ,
R. Feduzi ,
D. Inzaghi ,
A. Manara ,
C. Giori ,
I. Natali  and
V. Dallacasa
M. D. Giardina
Affiliation:
Institute of Advanced Materials, C.E.C. Joint Research Centre, Ispra Establishment, 21020 Ispra (Va), Italy
R. Feduzi
Affiliation:
Institute of Advanced Materials, C.E.C. Joint Research Centre, Ispra Establishment, 21020 Ispra (Va), Italy
D. Inzaghi
Affiliation:
Institute of Advanced Materials, C.E.C. Joint Research Centre, Ispra Establishment, 21020 Ispra (Va), Italy
A. Manara
Affiliation:
Institute of Advanced Materials, C.E.C. Joint Research Centre, Ispra Establishment, 21020 Ispra (Va), Italy
C. Giori
Affiliation:
Istituto di Scienze Fisiche, Universitá di Parma, 43100 Parma, Italy
I. Natali
Affiliation:
Dipartimento di Chimica e Fisica per i Materiali, Universitá di Brescia, 25100 Brescia, Italy
V. Dallacasa
Affiliation:
Istituto Policattedra, Universitá di Verona, 37100 Verona, Italy
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Abstract

Two classes of samples, designated A and B, of layered Bi–Sr–Ca–Cu oxides having the same nominal composition 4 : 3 : 3 : 4, but different thermal histories, were investigated by using field modulated microwave absorption (ESR), powder x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and x-ray absorption near the edge structure (XANES). Previous electrical resistivity measurements showed that the B samples presented only two superconducting phases with midpoints of the transition temperatures at ∼80 K and ∼105 K. The microwave absorption technique indicated instead the presence of islands which became superconducting at the above-mentioned temperatures also in the A samples. The crystalline and electronic structures of the two types of samples are illustrated and discussed. A plausible theoretical interpretation of the experimental results, based on a quantum percolation model with Coulomb interaction, is also given.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 8 , August 1997 , pp. 2009 - 2013
Copyright
Copyright © Materials Research Society 1997

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