Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 36: Superconductivity: Fe-based Superconductors - Fe(Se,Te), LiFeAs, and other Materials
TT 36.10: Talk
Wednesday, March 13, 2013, 12:00–12:15, H18
Resolving the quasiparticle scattering paradox in superconducting LiFeAs — •Christian Hess1, Steffen Sykora1, Torben Hänke1, Ronny Schlegel1, Danny Baumann1, Volodymyr Zabolotnyy1, Luminita Harnagea1, Sabine Wurmehl1, Jeroen van den Brink1,2, and Bernd Büchner1,2 — 1IFW Dresden, D-01171 Dresden, Germany — 2Department of Physics, TU Dresden, D-01069 Dresden, Germany
Several angle resolved photoemission spectroscopy (ARPES) studies reveal a poorly nested Fermi surface of LiFeAs, far away from a spin density wave instability, and clear-cut superconducting gap anisotropies. On the other hand a very different, more nested Fermi surface and dissimilar gap anisotropies have been obtained from quasiparticle interference (QPI) data, which were interpreted as arising from intraband scattering within hole-like bands. Here we show that this ARPES-QPI paradox is completely resolved by interband scattering between the hole-like bands. The resolution follows from an excellent agreement between experimental quasiparticle scattering data and T-matrix QPI calculations (based on experimental band structure data), which allows disentangling interband and intraband scattering processes.