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29 March 2024
 
  » arxiv » 1106.4217

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Probing unconventional superconductivity in LiFeAs by quasiparticle interference
T. Hänke ; S. Sykora ; R. Schlegel ; D. Baumann ; L. Harnagea ; S. Wurmehl ; M. Daghofer ; B. Büchner ; J. van den Brink ; C. Hess ;
Date 21 Jun 2011
AbstractThe quasiparticle interference (QPI) in a superconductor sensitively depends on the symmetry of the superconducting order parameter. To probe it, scanning tunneling spectroscopy has proven a powerful technique, in particular for revealing the nature of unconventional superconductivity. A particularly well suited material to apply this technique is the stoichiometric superconductor LiFeAs as it features clean, charge neutral cleaved surfaces without surface states and a relatively high Tc~18K. Here we show that in LiFeAs the quasiparticle scattering is governed by a van-Hove singularity at the center of the Brillouin zone which is in stark contrast with other pnictide superconductors where nesting is crucial for both scattering and s+- superconductivity. Indeed, within a minimal model and using the most elementary order parameters, calculations of the QPI suggest a dominating role of the hole-like bands for the quasiparticle scattering and in comparison with the QPI data do not support elementary singlet pairing symmetries (s+- or d-wave). This brings to mind that a more unusual pairing symmetry such as an elementary p-wave (which provides optimal agreement between the experimental data and QPI simulations) or a more complex order parameter (e.g. s+id-wave symmetry) is relevant in LiFeAs.
Source arXiv, 1106.4217
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