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By comparing experiments that use Andreev Saint-James reflection, Ramanscattering (B2g) and neutron scattering on the (cuprate) high temperaturesuperconductors, evidence is found, that all of the techniques can measure theorder parameter of these superconductors. The order parameter is the energyneeded to take a superconducting boson out of the condensate. It has the sametemperature and doping dependence as the superconducting transition temperatureTc. This condensation energy is different from the pairing energy (as measuredby the pseudogap) except for the doping x = 0.27, where the two energiescoincide: this latter situation represents the BCS case, which in the viewpresented here is a special case in the BCS-BEC cross-over situationappropriate for the (cuprate) high temperature superconductors.

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