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25 April 2024 |
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Revisit of the Orbital-Fluctuation-Mediated Superconductivity in LiFeAs: Nontrivial Spin-Orbit Interaction Effects on the Bandstructure and Superconducting Gap Function | | Tetsuro Saito
; Youichi Yamakawa
; Seiichiro Onari
; Hiroshi Kontani
; | | Date: |
6 Apr 2015 | | Abstract: | Precise gap structure in LiFeAs (Tc = 18 K) given by ARPES studies offers us
significant information to understand the pairing mechanism in iron-based
superconductors. The most remarkable characteristics in LiFeAs gap structure
would be that "the largest gap emerges on the tiny hole-pockets around Z
point". This result had been naturally explained in terms of the
orbital-fluctuation scenario (T. Saito et al., Phys. Rev. B 90, 035104 (2014)),
whereas an opposite result is obtained by the spin-fluctuation scenario. In
this paper, we study the gap structure in LiFeAs by taking the spin-orbit
interaction (SOI) into account, motivated by the recent ARPES studies that
revealed the significant SOI-induced modification of the Fermi surface
topology. For this purpose, we construct the two possible tight-binding models
with finite SOI by referring the bandstructures given by different ARPES
groups. In addition, we extend the gap equation for multiorbital systems with
finite SOI, and calculate the gap functions by applying the orbital-spin
fluctuation theory. On the basis of both SOI-induced band structures, main
characteristics of the gap structure in LiFeAs are naturally reproduced only in
the presence of strong inter-orbital interactions between (xz/yz - xy)
orbitals. Thus, the experimental gap structure in LiFeAs is a strong evidence
for the orbital-fluctuation pairing mechanism. | | Source: | arXiv, 1504.1249 | | Services: | Forum | Review | PDF | Favorites | |
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