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

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

2012-02-03

arxiv.org/abs/1202.0658v1

Physics

Condensed Matter

Superconductivity

Scientific paper

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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