2012/12/12 by Wolfram Brenig, A. L. Chernyshev
Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Ferromagnetism #Ground state #Magnet #Magnetic field #Magnetic properties of thin films #Magnetization #Magnon #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Scattering #Spin (aerodynamics) #Spin wave #Texture (cosmology) #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.110.157203
published as Phys. Rev. Lett. 110, 157203 (2013) · 5+5 pages, 4+5 figs
arxiv created 2012/12/12 · openalex publication_date 2013/04/09 · arxiv updated 2013/04/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We demonstrate that pointlike defects in noncollinear 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 noncollinear 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 noncollinear 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.