Unitary limit of spin-orbit scattering in two-dimensional s- and d-wave superconductors
Claudio Grimaldi
DOI 10.1103/PhysRevB.65.024507 · Physical Review B
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Abstract
Nonmagnetic impurities affect the paramagnetic response of superconductors via the associated spin-orbit interaction that, when the nonmagnetic impurity is close to the unitary limit, must be treated beyond the classical Born approximation. Here the Zeeman response of two-dimensional s- and d-wave superconductors is calculated within the self-consistent T-matrix formulation for both impurity and spin-orbit scatterings. It is shown that at the unitary limit, for which the spin-orbit scattering is maximum, the spin-up and spin-down channels become decoupled implying full Zeeman splitting of the quasiparticle excitations. These results could be used to test the unitary scattering hypothesis in high-Tc superconductors.
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