Quasiparticle interference in antiferromagnetic parent compounds of Fe-based superconductors

Abstract

Recently reported quasiparticle interference imaging in underdoped Ca(Fe{1-x}Co{x})_2As{2} shows pronounced C{2} asymmetry that is interpreted as an indication of an electronic nematic phase with a unidirectional electron band, dispersive predominantly along the $b$-axis of this orthorhombic material. On the other hand, even more recent transport measurements on untwinned samples show near isotropy of the resistivity in the $ab$ plane, with slightly larger conductivity along a (and not b). We show that in fact both sets of data are consistent with the calculated ab initio Fermi surfaces, which has a decisively broken C_{4}, and yet similar Fermi velocity in both directions. This reconciles completely the apparent contradiction between the conclusions of the STM and the transport experiments.

A version of this work was posted (arXiv:1005.1761) as a comment on a Science paper entitled "Nematic Electronic Structure in the Parent State of the Iron-Based Superconductor Ca(Fe1-xCox)2As2". The comment was rejected by Science on account of it being posted on the ArXiv. This is a version published in PRB as a research paper

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Cited by in corpus (10)

• Gap symmetry and structure of Fe-based superconductors
• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs
• Impurity-induced quasiparticle interference in the parent compounds of iron-pnictide superconductors
• Tunneling spectroscopy for probing orbital anisotropy in iron pnictides
• Odd-Parity Quasiparticle Interference in the Superconductive Surface State of UTe2
• Quasiparticle scattering interference in iron pnictides: A probe of the origin of nematicity
• Highly anisotropic quasiparticle interference patterns in the spin-density wave state of the iron pnictides
• Quasi-one Dimensional Nanostructures as Sign of Nematicity in Iron Pnictides and Chalcogenides
• Roles of anisotropic and unequal gaps in the quasiparticle interference of superconducting iron pnictides