Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 42: SC: Fe-based Superconductors - Fe(Se,Te)
TT 42.5: Talk
Wednesday, March 16, 2011, 19:45–20:00, HSZ 304
Quasiparticle interference in an iron-based superconductor — •Steffen Sykora1,2 and Piers Coleman2 — 1IFW Dresden, Institute for Theoretical Solid State Physics, P.O. Box 270116, D-01171 Dresden, Germany — 2Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA
We develop a model for the effect of a magnetic field on quasiparticle interference in an iron-based superconductor. Recently, scanning tunneling experiments have been performed on Fe(Se,Te) to determine the relative sign of the superconducting gap from the magnetic-field dependence of quasi-particle scattering amplitudes. Using a simple two-band BCS model we study three different cases of scattering in a spin-split spectrum. The dominant effect of a magnetic field in iron-based superconductors is caused by the Pauli limiting of conduction electrons. Thereby time reversal odd scattering is induced which enhances the sign-preserving and depresses the sign-reversing peaks in the quasiparticle interference patterns.