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

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

2010-07-21

arxiv.org/abs/1007.3579v1

Phys. Rev. B 82, 132504 (2010)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.82.132504

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 $d_{x^2-y^2}+ \imath d_{xy}$ 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 $La_{2-x}Sr_xCuO_2$ and $YBa_2Cu_3O_{7-\delta}$.

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