Quasiparticle interference in iron-based superconductors

A. Akbari; J. Knolle; I. Eremin; R. Moessner

doi:10.1103/PhysRevB.82.224506

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Quasiparticle interference in iron-based superconductors

A. Akbari, J. Knolle, I. Eremin, R. Moessner

DOI 10.1103/PhysRevB.82.224506 · Physical Review B

T1

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Abstract

We systematically calculate quasiparticle interference (QPI) signatures for the whole phase diagram of iron-based superconductors. Impurities inherent in the sample together with ordered phases lead to distinct features in the QPI images that are believed to be measured in spectroscopic imaging-scanning tunneling microscopy. In the spin-density wave phase the rotational symmetry of the electronic structure is broken, signatures of which are also seen in the coexistence regime with both superconducting and magnetic order. In the superconducting regime we show how the different scattering behavior for magnetic and nonmagnetic impurities allows to verify the s+− symmetry of the order parameter. The effect of possible gap minima or nodes is discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
SmFeAs(O1-xFx) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ca(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown