One of the properties of electrons is spin. The stern-gerlach expt demonstrated spin on a macrosopic scale. Does spin play a role in the change of conductivity?

One of the properties of electrons is spin. The stern-gerlach expt demonstrated spin on a macrosopic scale. Does spin play a role in the change of conductivity? In other words, does an externally applied magnetic field change the temperature at which superconductivity occurs or perhaps the slope of rising resistivity?