Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Correlated Electrons: Spin Systems, Itinerant Magnets 3
TT 28.12: Vortrag
Dienstag, 12. März 2013, 12:30–12:45, H19
Highly Dispersive Scattering From Defects In Non-Collinear Magnets — •Wolfram Brenig1,2 and Alexander L. Chernyshev3 — 1Institute for Theoretical Physics, Technical University Braunschweig, Germany — 2Technical University of Lower Saxony, NTH, Germany — 3Department of Physics, University of California, Irvine, USA
We demonstrate that point-like defects in non-collinear magnets give rise to a highly dispersive structure in the magnon scattering, violating a standard paradigm of its momentum independence. For a single impurity spin coupled to a prototypical non-collinear antiferromagnet, we find that the resolvent is dominated by a distinct dispersive structure with its momentum-dependence set by the magnon dispersion and shifted by the ordering vector. This feature is a consequence of umklapp scattering off the impurity-induced spin texture, which arises due to the non-collinear ground state of the host system. Detailed results for the staggered and uniform magnetization of this texture as well as the T-matrix from numerical linear spin-wave theory are presented.