Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 70: Superconductivity: Fe-based Superconductors - Theory

TT 70.3: Vortrag

Donnerstag, 23. März 2017, 15:45–16:00, HSZ 103

Competition of SDW and iCDW and the role of spin-orbit coupling — •Felix Ahn¹, Fabian Lambert¹, Maria N. Gastiasoro², Daniel D. Scherer², Brian M. Anderson², and Ilya Eremin¹ — ¹Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany — ²Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark

The magnetic stripe phase is a mutual feature of most the iron-based superconductors and can be described in the basis of the iron 3d-orbitals or, alternatively, it can be described within the band basis where magnetism occurs as a Fermi surface instability. In this work, we show how spin-orbit coupling causes an intrinsic spin-space anisotropy that is necessarily relevant for the different magnetic phases and that it lifts the Dirac cones of the nodal spin density-wave (SDW) order parameter, in particular. Most importantly, we show that spin-orbit coupling adds an inevitable companion to the SDW phase, namely a charge-current density-wave that is often dubbed imaginary charge density-wave (iCDW).