Nonzero Fermi Level Density of States for a Disordered d-Wave Superconductor in Two Dimensions

K. Ziegler; M. H. Hettler; P. J. Hirschfeld

doi:10.1103/PhysRevLett.77.3013

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Nonzero Fermi Level Density of States for a Disordered d-Wave Superconductor in Two Dimensions

K. Ziegler, M. H. Hettler, P. J. Hirschfeld

DOI 10.1103/PhysRevLett.77.3013 · Physical Review Letters

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Abstract

In 3D, arbitrarily weak disorder in superconductors with line nodes gives rise to a nonzero Fermi level density of states N(0), leading to characteristic low-temperature thermodynamics similar to that observed in cuprate and heavy-fermion systems. In a strictly 2D model, possibly appropriate for the cuprates, it has been argued that N(0) vanishes. We perform an exact calculation for a 2D d-wave superconductor with Lorentzian disorder and find a nonzero N(0). For other continuous distributions we obtain a nonzero lower bound for N(0). We discuss the reasons for this discrepancy.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown