Figure 1: FS topology of pristine LiFeAs and LiFe0.97Co0.03As. | Nature Communications

Figure 1: FS topology of pristine LiFeAs and LiFe0.97Co0.03As.

From: Observation of strong electron pairing on bands without Fermi surfaces in LiFe1−xCoxAs

Figure 1

(a,b) Plots of the ARPES intensity at EF of LiFeAs (Tc=18 K) and LiFe0.97Co0.03As (Tc=15 K) as a function of the two-dimensional wavevector measured at 30 K with the He Iα (hν=21.218 eV). The intensity is obtained by integrating the spectra within 10 meV with respect to EF. (c,d) Extracted kF loci of LiFeAs and LiFe0.97Co0.03As, respectively. The small hole-like FS at the BZ centre is sinking below EF due to the Co substitution and expected to significantly suppress the interband scattering between the electron and hole FSs.

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