2010/08/31 by A. Akbari, Alireza Akbari, Johannes Knolle +5
Materials Science · Physics and Astronomy · #Condensed matter physics #Impurity #Iron-based superconductors research #Materials science #Maxima and minima #Optics #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Rare-earth and actinide compounds #Scanning tunneling microscope #Scattering #Superconductivity #Symmetry (geometry) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.82.224506
published as Phys. Rev. B 82, 224506 (2010) · 19 pages, 7 figures
arxiv created 2010/11/05 · openalex publication_date 2010/12/08 · arxiv updated 2015/05/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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. 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 nonmagnetic impurities allows to verify the s^+\ensuremath- symmetry of the order parameter. The effect of possible gap minima or nodes is discussed.