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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
Delta(i)((k) over right arrow) should appear on the different electronic
bands i. Here, we introduce intraband Bogoliubov quasiparticle
scattering interference (QPI) techniques for determination of
Delta(i)((k) over right arrow) in such materials, focusing on lithium
iron arsenide (LiFeAs). We identify the three hole-like bands assigned
previously as gamma, alpha(2), and alpha(1), and we determine the
anisotropy, magnitude, and relative orientations of their Delta(i)((k)
over right arrow): These measurements will advance quantitative
theoretical analysis of the mechanism of Cooper pairing in iron-based
superconductivity.
