Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs

Abstract

If strong electron-electron interactions between neighboring Fe atoms mediate the Cooper pairing in iron-pnictide superconductors, then specific and distinct anisotropic superconducting energy gaps Δ_i(k) should appear on the different electronic bands i. Here we introduce intra-band Bogoliubov quasiparticle scattering interference (QPI) techniques for determination of Δ_i(k) in such materials, focusing on LiFeAs. We identify the three hole-like bands assigned previously as γ, α_2 and α_1, and we determine the anisotropy, magnitude and relative orientations of their Δ_i(k). These measurements will advance quantitative theoretical analysis of the mechanism of Cooper pairing in iron-based superconductivity.

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• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
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Cited by in corpus (24)

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• Scanning Tunneling Microscopy/Spectroscopy of Vortices in LiFeAs
• Scanning tunneling spectroscopy of superconducting LiFeAs single crystals: Evidence for two nodeless energy gaps and coupling to a bosonic mode
• Observation of strong electron pairing on bands without Fermi surfaces in LiFe1-xCoxAs
• Checkerboard stripe electronic state on cleaved surface of NdO${}_{0.7}$F${}_{0.3}$BiS${}_2$ probed by scanning tunneling microscope
• ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism
• Manipulation of gap nodes by uniaxial strain in iron-based superconductors
• Lower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap
• Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
• Incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering
• Molecular Beam Epitaxy Growth of Superconducting LiFeAs Film on SrTiO3(001) Substrate
• Effect of weak disorder on the phase competition in iron pnictides
• Spectral weight transfer in strongly correlated Fe${}_{1.03}$Te
• Phase diagram of Josephson junction between s and s+- superconductors in dirty limit
• Interband Quasiparticle Scattering in Superconducting LiFeAs Reconciles Photoemission and Tunneling Measurements
• Gap function of hexagonal pnictide superconductor SrPtAs from quasiparticle interference spectrum
• Optical Conductivity Evidence of Clean-Limit Superconductivity in LiFeAs
• The effect of spin fluctuations on the electronic structure in iron based superconductors
• Evolution of quasiparticle states with and without a Zn-impurity in doped 122 iron pnictides
• Angle-resolved photoemission studies of the superconducting gap symmetry in Fe-based superconductors
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs
• Isotropic multi-gap superconductivity in BaFe1.9Pt0.1As2 from thermal transport and spectroscopic measurements