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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

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 ∼36meV 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.

Original languageEnglish
Article number267002
JournalPhysical Review Letters
Volume108
Issue number26
DOIs
Publication statusPublished - 2012 Jun 26

ASJC Scopus subject areas

  • General Physics and Astronomy

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