Local Time-Reversal Symmetry Breaking in dx2-y2 Superconductors

Author(s): Matthias Graf, A. V. Balatsky and J. A. Sauls
Comments: 4 pages with figures

Journal: Physical Review B 61, 3255 (2000) [DOI]

Abstract: We show that an isolated impurity in a spin singlet dx2-y2 superconductor generates a dxy order parameter with locally broken time-reversal symmetry. The origin of this effect is a coupling between the dx2-y2 and the dxy order parameters induced by spin-orbit scattering off the impurity. The signature of locally broken time-reversal symmetry is an induced orbital charge current near the impurity, which generates a localized magnetic field in the vicinity of the impurity. We present a microscopic theory for the impurity induced dxy component, discuss its spatial structure as well as the pattern of induced current and local magnetic field near the localized impurity spin.

Eprint: [PDF] [PS] [arXiv]

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