Sykora, S. and Coleman, Piers (2011) Quasiparticle interference in an iron-based superconductor. Physical Review B, 84 (5).
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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 quasiparticle 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.
This is a Submitted version This version's date is: 2/8/2011 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/80269752-de7e-ec09-e147-d5f416d79bea/4/
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