Comment on "Scaling of the quasiparticle spectrum for d-wave superconductors"

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In a recent Letter Simon and Lee suggested a scaling law for thermodynamic and kinetic properties of superconductors with lines of gap nodes. However their crossover parameter between the bulk dominated regime and the vortex dominated regime is different from that found in our paper (N.B. Kopnin and G.E. Volovik, JETP Lett., 64, 690 (1996); see also cond-mat/9702093). We discuss the origin of the disagreement.