Anisotropy of the gap parameter in the hole-doped cuprates

The structure of the gap parameter ($Δ_{k}$) for the hole-doped cuprates has been studied. The obtained results indicate that the antinodal part of $Δ_{k}$ is very weakly temperature dependent and above the critical temperature ($T_{C}$), it extends into the anomalous normal state to the pseudogap temperature. On the other hand, the values of $Δ_{k}$, which are close to the nodal part, are strongly temperature dependent. The model has been tested for the ${\rm YBa_{2}Cu_{3}O_{7-δ}}$ superconductor. It has been shown that the theoretical results agree with the experimental data.

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