Orbital mismatch boosting nematic instability in iron-based superconductors

Abstract

We derive the effective action for the collective spin modes in iron-based superconductors. We show that, due to the orbital-selective nature of spin fluctuations, the magnetic and nematic instabilities are controlled by the degrees of orbital nesting between electron and hole pockets. Within a prototypical three-pockets model the hole-electron orbital mismatch is found to boost spin-nematic order. This explains the enhancement of the nematic order in FeSe as compared to 122 compounds, and its suppression under pressure, where the emergence of the second hole pocket compensates the orbital mismatch of the three-pockets configuration.

5 pages, 3 figures, 1 figure added

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Cited by in corpus (24)

• Nematicity, magnetism and superconductivity in FeSe
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• The Nematic Energy Scale and the Missing Electron Pocket in FeSe
• Nematic Pairing from Orbital Selective Spin Fluctuations in FeSe
• Lifted electron pocket and reversed orbital occupancy imbalance in FeSe
• Collapse of critical nematic fluctuations in FeSe under pressure
• Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
• Singular magnetic anisotropy in the nematic phase of FeSe
• Nematicity and superconductivity: Competition versus cooperation
• Lattice-Shifted Nematic Quantum Critical Point in FeSe${}_{1-x}$S${}_x$
• Magnetic tricritical point and nematicity in FeSe under pressure
• Raman response in the nematic phase of FeSe
• Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe
• Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• Strain-derivative of thermoelectric properties: a sensitive probe for nematicity
• Nematic Fluctuations in an Orbital Selective Superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Scaling of the Fano effect of the in-plane Fe-As phonon and the superconducting critical temperature in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Anisotropy of the DC conductivity due to orbital-selective spin fluctuations in the nematic phase of iron superconductors
• Theories for charge-driven nematicity in kagome metals
• Photoinduced nematic state in FeSe${}_{0.4}$Te${}_{0.6}$
• The role of orbital nesting in the superconductivity of Iron-based Superconductors
• Resistivity anisotropy from the multiorbital Boltzmann equation in nematic FeSe
• Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe