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• W2519273025 abstract "We study superconducting instability from orbital nematic fluctuations in a minimal model consisting of the ${d}_{xz}$ and ${d}_{yz}$ orbitals, and choose model parameters which capture the typical Fermi surface geometry observed in iron-based superconductors. We solve the Eliashberg equations down to low temperatures with keeping the renormalization function and a full momentum dependence of the pairing gap. When superconductivity occurs in the tetragonal phase, we find that the pairing gap exhibits a weak momentum dependence over the Fermi surfaces. The superconducting instability occurs also inside the nematic phase. When the ${d}_{xz}$ orbital is occupied more than the ${d}_{yz}$ orbital in the nematic phase, a larger (smaller) gap is realized on the Fermi-surface parts where the ${d}_{xz}$ $({d}_{yz})$ orbital component is dominant, leading to a substantial momentum dependence of the pairing gap on the hole Fermi surfaces. On the other hand, the momentum dependence of the gap is weak on the electron Fermi surfaces. We also find that while the leading instability is the so-called ${s}_{++}$-wave symmetry, the second leading one is ${d}_{{x}^{2}ensuremath{-}{y}^{2}}$-wave symmetry. In particular, these two states are nearly degenerate in the tetragonal phase, whereas such quasidegeneracy is lifted in the nematic phase and the ${d}_{{x}^{2}ensuremath{-}{y}^{2}}$-wave symmetry changes to highly anisotropic $s$-wave symmetry." @default.
• W2519273025 created "2016-09-23" @default.
• W2519273025 creator A5016244276 @default.
• W2519273025 creator A5043458889 @default.
• W2519273025 date "2016-12-09" @default.
• W2519273025 modified "2023-10-14" @default.
• W2519273025 title "Structure of the pairing gap from orbital nematic fluctuations" @default.
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• W2519273025 doi "https://doi.org/10.1103/physrevb.94.214505" @default.
• W2519273025 hasPublicationYear "2016" @default.
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