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

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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 ∼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

  • Physics and Astronomy(all)

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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., & Wu, M. K. (2012). Gap opening and orbital modification of superconducting FeSe above the structural distortion. Physical Review Letters, 108(26), [267002]. https://doi.org/10.1103/PhysRevLett.108.267002