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Advances in Condensed Matter Physics
Volume 2015, Article ID 969564, 10 pages
Research Article

The Correlation between the Energy Gap and the Pseudogap Temperature in Cuprates: The YCBCZO and LSHCO Case

Institute of Physics, Czȩstochowa University of Technology, Aleja Armii Krajowej 19, 42-200 Czȩstochowa, Poland

Received 12 February 2015; Accepted 20 May 2015

Academic Editor: Guoying Gao

Copyright © 2015 R. Szczȩśniak et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The paper analyzes the influence of the hole density, the out-of-plane or in-plane disorder, and the isotopic oxygen mass on the zero temperature energy gap (2Δ(0)) (YCBCZO) and (LSHCO) superconductors. It has been found that the energy gap is visibly correlated with the value of the pseudogap temperature (). On the other hand, no correlation between 2Δ(0) and the critical temperature () has been found. The above results mean that the value of the dimensionless ratio can vary very strongly together with the chemical composition, while the parameter does not change significantly. In the paper, the analytical formula which binds the zero temperature energy gap and the pseudogap temperature has been also presented.