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

A. Valli, G. Sangiovanni, M. Capone, and C. Di Castro
Phys. Rev. B 82, 132504 – Published 7 October 2010

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 dx2y2 gap, the most stable realization of a mixed order parameter has a time-reversal breaking dx2y2+ıdxy 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 La2xSrxCuO2 and YBa2Cu3O7y.

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  • Received 18 June 2010

DOI:https://doi.org/10.1103/PhysRevB.82.132504

©2010 American Physical Society

Authors & Affiliations

A. Valli and G. Sangiovanni

  • Institute für Festkörperphysik, Technische Universität Wien, Wiedner Hauptstrasse 8//138, 1040 Vienna, Austria

M. Capone and C. Di Castro

  • ISC-CNR and Dipartimento di Fisica, Università Sapienza, P.le Aldo Moro 2, I-00185 Roma, Italy

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Issue

Vol. 82, Iss. 13 — 1 October 2010

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