The correlation between the energy gap and the pseudogap temperature in cuprates: the YCBCZO and LSHCO case

2014/12/11 by Szczȩśniak, R., Jarosik, M. W., Duda, A. M.
#FOS: Physical sciences #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.1412.3821

Abstract

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)) for \rmY_1-x\rmCa_x\rmBa₂(\rmCu_1-y\rmZn_y)₃\rmO_7-δ (YCBCZO) and \rmLa_1.96-x\rmSr_x\rmHo_0.04\rmCuO₄ (LSHCO) superconductors. It has been found that the energy gap is visibly correlated with the value of the pseudogap temperature (T^⋆). On the other hand, no correlation between 2Δ(0) and the critical temperature (T_C) has been found. The above results mean that the value of the dimensionless ratio 2Δ(0)/k_BT_C can vary very strongly together with the chemical composition, while the parameter 2Δ(0)/k_BT^⋆ 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.

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