Gap Opening and Orbital Modification of Superconducting FeSe above the Structural Distortion

Y.-C. Wen; K.-J. Wang; H.-H. Chang; J.-Y. Luo; C.-C. Shen; H.-L. Liu; C.-K. Sun; M.-J. Wang; M.-K. Wu

doi:10.1103/PhysRevLett.108.267002

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Gap Opening and Orbital Modification of Superconducting FeSe above the Structural Distortion

Y.-C. Wen, K.-J. Wang, H.-H. Chang, J.-Y. Luo, C.-C. Shen, H.-L. Liu, C.-K. Sun, M.-J. Wang, M.-K. Wu

DOI 10.1103/PhysRevLett.108.267002 · Physical Review Letters

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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 gaplike quasiparticles (associated with 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
FeSe1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure not reported	onset
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure not reported	onset