We argue that Raman scattering in B-1g symmetry allows one to distinguish between phonon-mediated and magnetically mediated d-wave superconductivity. In spin-mediated superconductors, B-1g Raman intensity develops a resonance at a frequency Omega(res)< 2 Delta(max), 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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