Physics – Condensed Matter – Superconductivity
Scientific paper
2010-10-18
Phys. Rev. B 84, 054501 (2011)
Physics
Condensed Matter
Superconductivity
final version, some changes in the text
Scientific paper
10.1103/PhysRevB.84.054501
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.
Coleman Piers
Sykora Steffen
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