Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor

Abstract

We have performed high-resolution angle-resolved photoemission spectroscopy on FeSe superconductor (Tc ~ 8 K), which exhibits a tetragonal-to-orthorhombic structural transition at Ts ~ 90 K. At low temperature we found splitting of the energy bands as large as 50 meV at the M point in the Brillouin zone, likely caused by the formation of electronically driven nematic states. This band splitting persists up to T ~ 110 K, slightly above Ts, suggesting that the structural transition is triggered by the electronic nematicity. We have also revealed that at low temperature the band splitting gives rise to a van Hove singularity within 5 meV of the Fermi energy. The present result strongly suggests that this unusual electronic state is responsible for the unconventional superconductivity in FeSe.

5 pages, 3 figures

References in corpus (13)

• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Theory of Electron Nematic Order in LaOFeAs
• The Structural Phase Transition in FeSe (Fe1+dSe)
• Ising and Spin orders in Iron-based Superconductors
• Nematic and meta-nematic transitions in the iron pnictides
• Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?
• Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
• Orbital Order and Spontaneous Orthorhombicity in Iron Pnictides
• Magnetoelastic Coupling in the Phase Diagram of Ba1-xKxFe2As2
• Electric Transport of a Single Crystal Iron Chalcogenide FeSe Superconductor: Evidence of Symmetry Breakdown Nematicity and Additional Ultrafast Dirac cone-Like Carriers
• Measurement of Coherent Polarons in the Strongly Coupled Antiferromagnetically Ordered Iron-Chalcogenide Fe1.02Te using Angle-Resolved Photoemission Spectroscopy
• Dynamic competition between spin density wave order and superconductivity in underdoped $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$

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