2014/05/31 by Pasquale Marra, Jeroen van den Brink, Steffen Sykora · 7 citations
Engineering · Materials Science · Physics and Astronomy · #Angle-resolved photoemission spectroscopy #Electronic and Structural Properties of Oxides #Fermi surface #Inelastic scattering #Iron-based superconductors research #Pairing #Quasiparticle #Resonant inelastic X-ray scattering #SAS software applications and methods #Scattering #Spectral line #Spin (aerodynamics) #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1038/srep25386
published in Scientific Reports 6(1), 25386 (Nature Portfolio) · 12 pages, 5 figures
arxiv created 2016/05/06 · openalex publication_date 2016/05/06 · arxiv updated 2016/05/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We develop a phenomenological theory to predict the characteristic features of the momentum-dependent scattering amplitude in resonant inelastic x-ray scattering (RIXS) at the energy scale of the superconducting gap in iron-based super-conductors. Taking into account all relevant orbital states as well as their specific content along the Fermi surface we evaluate the charge and spin dynamical structure factors for the compounds LaOFeAs and LiFeAs, based on tight-binding models which are fully consistent with recent angle-resolved photoemission spectroscopy (ARPES) data. We find a characteristic intensity redistribution between charge and spin dynamical structure factors which discriminates between sign-reversing and sign-preserving quasiparticle excitations. Consequently, our results show that RIXS spectra can distinguish between s± and s++ wave gap functions in the singlet pairing case. In addition, we find that an analogous intensity redistribution at small momenta can reveal the presence of a chiral p-wave triplet pairing.