Resonance mode in B1g Raman scattering -- a way to distinguish between spin-fluctuation and phonon-mediated d-wave superconductivity
Abstract
We argue that Raman scattering in B1g symmetry allows one to distinguish between phonon-mediated and magnetically-mediated d-wave superconductivity. In spin mediated superconductors, B1g Raman intensity develops a resonance at a frequency ωres < 2max, whose origin is similar to a neutron resonance. In phonon-mediated d-wave superconductors, such a resonance does not develop. Several extensions of the argument are presented.
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