Phenomenological Theory of Superconductivity and Effects of Antiferromagnetic and Spiral Order in Ho1-xDyxNi2B2C

The coexistence of superconductivity and magnetism in Ho 1- x Dy x Ni 2 B 2 C is studied by using a phenomenological model that is based on the Ginzburg–Landau theory. This model includes two magnetic and two superconducting order parameters accounting for the multiband structure of Ho 1- x Dy x Ni 2 B 2 C. The doping dependence of T c and the effects of antiferromagnetic and spiral order in this material are analyzed.