Abstract
We suggest that the generalized Ginzburg-Landau free energy functional describing the superconducting phases of the 123 compounds requires at least two order parameters each one disappearing at a distinct critical temperature. We point out similarities to the heavy fermion system U 1−x Th x Be 13 , which has, however, cubic symmetry and therefore does not show the high anisotropy effects of the high Tc materials.
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