Quasiparticle interference in an iron-based superconductor

S. Sykora, Piers Coleman

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number054501
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number5
DOIs
StatePublished - Aug 2 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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