Interplay between band structure and gap symmetry in a two-dimensional anisotropic superconductor

A. J. Fedro; D. D. Koelling

doi:10.1103/PhysRevB.47.14342

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Interplay between band structure and gap symmetry in a two-dimensional anisotropic superconductor

A. J. Fedro, D. D. Koelling

DOI 10.1103/PhysRevB.47.14342 · Physical Review B

T1

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Abstract

We consider the two-dimensional quasiparticle density of states and superconductor-insulator-superconductor (SIS) tunneling conductance, σ(V), using a BCS-like framework for a gap function exhibiting the symmetries of an unspecified off-site pairing interaction. For d-wave pairing, we find the usual nodal structure in the gap function. In addition, one can also find nodal structure at the Fermi surface for a gap function with extended s-wave symmetry (but only when hopping beyond near neighbors is considered). This is a universal feature arising solely due to the interplay between the Fermi-surface geometry and the momentum variation of the gap function and leads to unique signatures in the SIS tunneling spectra.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 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