Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity: Fe-based Superconductors - Theory
TT 30.4: Vortrag
Dienstag, 8. März 2016, 12:00–12:15, H19
Dynamical coupled modes theory for an s±-pairing mechanism of superconductivity in doped iron pnictides — Mikhail Kiselev1, •Dmitry Efremov2, Stefan-Ludwig Drechsler2, Konstantin Kikoin3, and Jeroen van den Brink2 — 1International Center for Theoretical Physics, I-34151 Trieste, Italy — 2Institute for Theoretical Solid State Physics at the Leibniz Institute for Solid State an Materials Research Dresden, IFW-Dresden, D-01171 Dresden, Germany — 3School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, Israel
We develop a high-temperature approach to the problem of the interplay between magnetic and superconducting phases in multi-band iron pnictides. A dynamical mode-mode coupling theory is derived from the the microscopic theory based on the solution of the coupled Bethe-Salpeter equations. We focus on the vicinity to a spin density wave (SDW) where spin fluctuations enhance the onset of superconducting ordering. Special attention is paid to arsenic deficient
materials where As vacancies behaves as effective magnetic defects [1]. The proposed theory allows generalization to multi-mode regimes.
K. Kikoin, S.-L. Drechsler, K. Koepernik, J. Málek,
and J. van den Brink, Nature, Scientific Reports 5, 11280 (2015).