1. Gap opening and orbital modification of superconducting FeSe above the structural distortion
- Author
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Wen, Y. -C., Wang, K. -J., Chang, H. -H., Luo, J. -Y., Shen, C. -C., Liu, H. -L., Sun, C. -K., Wang, M. -J., and Wu, M. -K.
- Subjects
Condensed Matter - Superconductivity ,Physics - Optics - 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.
- Published
- 2012
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