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Using the Ginzburg-Landau theory for two-band superconductors, we determinethe surface energy, sigma_s, between coexisting normal and superconductingstates at the thermodynamic critical magnetic field. Close to the transitiontemperature, where the Ginzburg-Landau theory is applicable, we demonstratethat the two-band problem maps onto an effective single band problem. While theorder parameters of the two bands may have different amplitudes in thehomogeneous bulk, near the critical temperature the Josephson-like couplingbetween the bands leads to the same spatial dependence of both order parametersnear the interface. This finding puts into question the possibility ofintermediate, so called type-1.5 superconductivity, in the regime where theGinzburg-Landau theory applies.

Interface energy of two band superconductors