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Correlation Between Nonlinear Charge Transfer and Behaviour of Tc in YBa2Cu3O7-y System

Published online by Cambridge University Press:  26 February 2011

Y. Zhao ,
H. K. Liu  and
S. X. Dou
Y. Zhao
Affiliation:
School of Materials Science and Engineering, The University of New South Wales, P. O. Box 1, Kensington, NSW 2033, Australia
H. K. Liu
Affiliation:
School of Materials Science and Engineering, The University of New South Wales, P. O. Box 1, Kensington, NSW 2033, Australia
S. X. Dou
Affiliation:
School of Materials Science and Engineering, The University of New South Wales, P. O. Box 1, Kensington, NSW 2033, Australia
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Abstract

The charge transfer in YBa2CU3O7-y system have been analysed by bond valence sum calculation. It is found that there exists an additional effective charge-transfer between the CuO2 planes and the CuO chain which varies nonlinearly with the oxygen stoichiometry and can be expressed as q = 0.151 exp(∼0.007/y4) + 0.35 exp(0.5 – 0.5/y4). This nonlinear charge-transfer is associated with the structural transitions of orthorhombic (I)-to-orthorhombic(II) and orthorhombic(II)-to-tetragonal symmetry, and thus related to the oxygen ordering in the CuO chains. A new relationship between the mobile hole number P(2) the localised hole number P(l) and the total hole number P has been established as P(2) = P - P(1), P(1) = 0.5 - y - q. The results also show that the 90 K and 60 K plateaus in Tc as a function of oxygen stoichiometry correspond to the plateaus in the curve of q versus y, indicating that both the nonlinear variations of Tc and the charge-transfer with the oxygen stoichiometry are intrinsically correlated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 693
Copyright
Copyright © Materials Research Society 1992

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References

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