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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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