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Structural and Electronic Relationships in the High-Temperature Copper-Based Superconductors

Published online by Cambridge University Press:  21 February 2011

C.C. Torardi ,
D. Jung ,
D.B. Kang ,
J. Ren  and
M.-H. Whangbo
C.C. Torardi
Affiliation:
Central Research and Development Department, E.I. du Pont de Nemours and Co., Inc., Experimental Station, Wilmington, Delaware, 19880–0356
D. Jung
Affiliation:
Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695–8204
D.B. Kang
Affiliation:
Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695–8204
J. Ren
Affiliation:
Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695–8204
M.-H. Whangbo
Affiliation:
Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695–8204
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Abstract

Atomic displacements from the ideal rock-salt positions in the Tl-, Bi-, and Pb-O layers of the Cu-based high-Tc super-conductors affect the electronic nature of these oxides. When distortions in the Bi-O layers of Bi2Sr2CaCu2O8 are considered, the bottom of the Bi 6p band is found to lie more than 1 eV above the Fermi level. Displacements in the double Tl-O layers of Tl2Ba2Can−1CunO2n+4 places the bottom of the Tl 6s bands significantly below the Fermi level showing that electrons can be removed from the x2-y2 bands of the CuO2 layers. However, this is not the case for the thallium-oxygen single layers of Tl2Ba2Can−1CunO2n+3. Correlations between the superconducting transition temperatures, Tc, and the in-plane Cu-O bond lengths, rCu−O', of the Tl- and Bi- based copper-oxide super-conductors reveal Tc vs rCu−O characteristics similar to those found for La2−xSrxCuO4.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 156: Symposium M – High Temperature Superconductors: Relationships Between Properties, Structure, and Solid State Chemistry , 1989 , 295
Copyright
Copyright © Materials Research Society 1989

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References

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