Two superconducting phase transitions in hybrid pairing superconductors

Hybrid pairing superconductors with two bands of localized and delocalized states in the presence of uniform molecular fields and finite displacement of bands are analyzed in mean field theory for finite temperature. A new ground-state both magnetic and superconducting exists at finite temperature for certain values of the model parameters beside the usual BCS groundstate. Both states are accessible consecutively by lowering the temperature or pressure. (author)