Abstract

Using a Ginsburg-Landau free-energy functional, we study theH-T phase diagram of a weak magnetic superconductor, where themagnetization from the magnetic component is marginal insupporting a spontaneous vortex phase. In particular, thecompetition between the spiral state and spontaneous vortex phaseis analysed. Our theory is applied to understand the magneticproperties of ErNi2B2C.

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