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TT: Fachverband Tiefe Temperaturen

TT 17: SC: Iron-Based Superconductors - Theoretical Approaches

TT 17.4: Vortrag

Dienstag, 23. März 2010, 14:45–15:00, H20

Itinerant spin excitations in the spin-density-wave state of the iron pnictides — •Philip Brydon and Carsten Timm — Technische Universität Dresden, Dresden, Germany

The proper understanding of the antiferromagnetism of the iron pnictide parent compounds is expected to provide important insights into the superconductivity of these materials. We consider a model where the spin density wave (SDW) arises from an excitonic instability of nested electron-like and hole-like Fermi pockets [1]. Using the random phase approximation, we obtain the transverse spin susceptibility within the SDW state, which allows us to determine the collective spin-wave dispersions and the single-particle continua [2]. Our results are compared to experimental findings, and the implications for electronic-only models of the SDW order are discussed.

[1] P. M. R. Brydon and C. Timm, Phys. Rev. B 79, 180504(R) (2009).

[2] P. M. R. Brydon and C. Timm, Phys. Rev. B 80, 174401 (2009).