Evolution of density of states for Fulde–Ferrell-type superconductors

Abstract The evolution of the density of states as a function of Zeeman magnetic field is studied assuming that the superconducting order parameter has a spatial modulation in the form of a Fulde–Ferrell–Larkin–Ovchinnikov-type state. The competition between the gain in the paramagnetic energy for the normal electrons and that one of the depaired electrons induced by the modulation of the order parameter, is discussed for a s-wave-type superconductor.