Local Time-Reversal Symmetry Breaking in d_(x2-y2) Superconductors

Details Local Time-Reversal Symmetry Breaking in d_(x2-y2) Superconductors Local Time-Reversal Symmetry Breaking in d_(x2-y2) Superconductors

1999-07-20

arxiv.org/abs/cond-mat/9907300v1

Physical Review B 61 3255-3258 (2000)

Physics

Condensed Matter

Superconductivity

4 pages in ReVTeX format. PACS numbers: 74.25Bt, 74.62Dh

Scientific paper

10.1103/PhysRevB.61.3255

We show that an isolated impurity in a spin singlet d_{x2-y2} superconductor generates a d_{xy} order parameter with locally broken time-reversal symmetry. The origin of this effect is a coupling between the d_{x2-y2} and the d_{xy} order parameter 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 d_{xy} component, discuss its spatial structure as well as the pattern of induced current and local magnetic field near the localized impurity spin.

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