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

Authors: R. Szczȩśniak; M. W. Jarosik; A. M. Duda
Journal: Advances in Condensed Matter Physics
 (2015)

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## 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))Y
1
-
x
C
a
x
B
a
2
C
u
1
-
y
Z
n
y
3
O
7
-
δ (YCBCZO) and La
1.96
-
x
Sr
x
Ho
0.04
CuO
4 (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 2
Δ
0
/
k
B
T
C can vary very strongly together with the chemical composition, while the parameter 2
Δ
(
0
)
/
k
B
T
⋆ 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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## Body


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*Source: 969564-2015-10-01.xml*