Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: SC: Fe-based Superconductors - Theory
TT 32.5: Vortrag
Mittwoch, 16. März 2011, 11:30–11:45, HSZ 304
Superconductivity and Magnetism in Iron-Based Superconductors: Insights from Quasiparticle Interference — •Alireza Akbari1, Johannes Knolle2, Ilya Eremin1, and Roderich Moessner2 — 1Theoretische Physik III, Ruhr-Universität Bochum, D-44780, Bochum, Germany — 2Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany
The phase diagram of iron-based superconductors exhibits an anti ferromagnetic phase at low doping and an unconventional superconducting phase at larger carrier concentration. Some compounds are even believed to have a microscopic coexistence regime of both orders. We systematically calculate quasiparticle interference (QPI) signatures for the whole phase diagram of iron-based superconductors. Impurities inherent in the sample together with ordered phases lead to distinct features in the QPI images that are believed to be measured in spectroscopic imaging-scanning tunneling microscopy (SI-STM).
In the spin-density wave phase the rotational symmetry of the electronic structure is broken, signatures of which are also seen in the coexistence regime with both superconducting and magnetic order.
In the superconducting regime we show how the different scattering behavior for magnetic and non-magnetic impurities allows to verify the s± symmetry of the order parameter. The effect of possible gap minima or nodes is discussed.
A. Akbari, J. Knolle, I. Eremin, and R. Moessner, Phys. Rev. B, 82, (2010) (in press).
J. Knolle, I. Eremin, A. Akbari, and R. Moessner,
Phys. Rev. Lett. 104, 257001 (2010).