Gap opening and orbital modification of superconducting FeSe above the structural distortion

Abstract

We utilize steady-state and transient optical spectroscopies to examine the responses of nonthermal quasiparticles with respect to orbital modifications in normal-state iron-chalcogenide superconductors. The dynamics shows the emergence of gap-like quasiparticles (associated to a ~36 meV energy gap) with a coincident transfer of the optical spectral weight in the visible range, at temperatures above the structural distortion. Our observations suggest that opening of the high-temperature gap and the lattice symmetry breaking are possibly driven by short-range orbital and/or charge orders, implicating a close correlation between electronic nematicity and precursor order in iron-based superconductors.

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• Ultrafast Dynamics Evidence of High Temperature Superconductivity in Single Unit Cell FeSe on SrTiO3
• Pseudogap formation above the superconducting dome in iron-pnictides
• Interatomic Coulomb interaction and electron nematic bond order in FeSe
• Local orbital degeneracy lifting as a precursor to an orbital-selective Peierls transition
• Interplay between lattice and spin states degree of freedom in the FeSe superconductor: dynamic spin state instabilities
• Evidence for Orbital Order and its Relation to Superconductivity in FeSe0.4Te0.6
• Room temperature local nematicity in FeSe superconductor
• Nematicity and in-plane anisotropy of superconductivity in $\beta$-FeSe detected by ${}^{77}$Se nuclear magnetic resonance
• In-plane optical spectroscopy study on FeSe epitaxial thin film grown on SrTiO${}_3$ substrate
• Band structure reconstruction across nematic order in high quality FeSe single crystal as revealed by optical spectroscopy study
• Ultrafast spectroscopy of quasiparticle dynamics in cuprate superconductors
• Role of the Extra-Fe in K2-xFe4+ySe5 superconductors
• Gap-dependent quasiparticle dynamics and coherent acoustic phonons in parent iron pnictide CaFe2As2 across the spin density wave phase transition
• Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ studied using ultrafast optical spectroscopy