Disorder effects in two-dimensional d-wave superconductors

A. A. Nersesyan; A. M. Tsvelik; F. Wenger

doi:10.1103/PhysRevLett.72.2628

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Disorder effects in two-dimensional d-wave superconductors

A. A. Nersesyan, A. M. Tsvelik, F. Wenger

DOI 10.1103/PhysRevLett.72.2628 · Physical Review Letters

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Abstract

We show that weak nonmagnetic impurities in a two-dimensional d-wave superconductor introduce a nontrivial exponent in the energy dependence of the single-particle density of states: ρ(ω)∼‖ω‖α. The exponent α>0 is exactly calculated for two types of disorder. We argue that the appearance of a finite ρ(0) would be equivalent to breaking of a continuous symmetry, prohibited in two dimensions. The method we use is based on the Abelian and non-Abelian bosonization of the effective model of 1D interacting fermions.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown