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We consider a disordered d--wave superconductor in two dimensions. Recently,we have shown in an exact calculation that for a lattice model with aLorentzian distributed random chemical potential the quasiparticle density ofstates at the Fermi level is nonzero. As the exact result holds only for thespecial choice of the Lorentzian, we employ different methods to show that fora large class of distributions, including the Gaussian distribution, one canestablish a nonzero lower bound for the Fermi level density of states. The factthat the tails of the distributions are unimportant in deriving the lower boundshows that the exact result obtained before is generic.Comment: 15 preprint pages, no figures, submitted to PR

physical review. b, condensed matter

Lower bound for the Fermi-level density of states of a disordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi></mml:math>-wave superconductor in two dimensions

Lower bound for the Fermi-level density of states of a disorderedd-wave superconductor in two dimensions