Model for the coexistence of d-wave superconducting and charge-density-wave order parameters in high-temperature cuprate superconductors

Abstract

A theory describing a phase, where d-wave superconductivity coexists with charge-density waves (CDWs), has been developed. Numerical calculations were carried out for a specific case of cuprates when the CDW gap emerges at the nested antinodal regions of the two-dimensional Fermi surface. Different symmetries of the order parameters leads to their involved interplay so that the CDW one Σ(T) is predicted to become temperature re-entrant for certain ranges of model parameters. Here, T is the temperature. At the same time, the superconducting energy gap Δ(T) deviates substantially from the canonical dx2−y2 form. The CDW influence on Δ(T) is different from that on the critical temperature Tc. Hence, the resulting values of 2Δ(0)/Tc are shown to fall into the range 5÷8, which is well known for high-Tc oxides and has not been explained yet.

Source-reported materials — not catalogue approval

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