Electronic Dispersion Anomalies in the Iron Pnictide Superconductors. / Heimes, Andreas; Grein, Roland; Eschrig, Matthias.In: Physical Review Letters, Vol. 106, No. 4, 28.01.2011, p. 047003.
Research output: Contribution to journal › Letter
Recently, experimental studies of the spin excitation spectrum revealed, like in the cuprates, a strong temperature dependence in the normal state and a resonance feature in the superconducting state. Based on these findings, we develop a model of electrons interacting with a temperature dependent magnetic excitation spectrum and apply it to analyse angle resolved photoemission and tunnelling spectra in Ba1-xKxFe2As2. We reproduce in quantitative agreement with experiment a renormalisation of the quasiparticle dispersion both in the normal and the superconducting state, and the dependence of the quasiparticle linewidth on binding energy. We estimate the strength of the coupling between electronic and spin excitations. Our findings support a dominantly magnetic pairing mechanism.
|Number of pages||4|
|Journal||Physical Review Letters|
|Journal publication date||28 Jan 2011|
|Early online date||24/01/11|