The order parameter of high temperature superconductors, as measured by Andreev Saint-James reflection, Raman and neutron scattering

By comparing experiments that use Andreev Saint-James reflection, Raman scattering (B2g) and neutron scattering on the (cuprate) high temperature superconductors, evidence is found, that all of the techniques can measure the order parameter of these superconductors. The order parameter is the energy needed to take a superconducting boson out of the condensate. It has the same temperature and doping dependence as the superconducting transition temperature Tc. This condensation energy is different from the pairing energy (as measured by the pseudogap) except for the doping x = 0.27, where the two energies coincide: this latter situation represents the BCS case, which in the view presented here is a special case in the BCS-BEC cross-over situation appropriate for the (cuprate) high temperature superconductors.

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