On the possible secondary component of the order parameter observed in London penetration depth measurements

Abstract

We discuss the effect of a secondary component of the superconducting order parameter on the superfluid density in the cuprates. If we assume a main $d_{x^2-y^2}$ gap, the most stable realization of a mixed order parameter has a time-reversal breaking $d_{x^2-y^2}+ıd_{xy}$ symmetry. In this state the nodes are removed and the temperature dependence of the superfluid density changes from the linear behavior of a pure d-wave to a more rounded shape at low temperature. The latter is compatible with the behavior experimentally observed in the in-plane magnetic field penetration depth of optimally doped $L{a}_{2-x}S{r}_{x}Cu{O}_2$ and $YB{a}_{2}C{u}_3{O}_{7-\delta }$.

4 pages, 2 figures, submitted to Phys. Rev. B

References in corpus (3)

• Evidence for complex order parameter in La_{1.83}Sr_{0.17}CuO_4
• Universal observation of multiple order parameters in cuprate superconductors
• Superconducting electronic state in optimally doped YBa2Cu3O7-d observed with laser-excited angle-resolved photoemission spectroscopy