SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 57: Poster: Superconductivity I
TT 57.5: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG2
Magnon dispersion of SrRuO3 studied by inelastic neutron scattering experiments — Kevin Jenni1, •Akshay Tewari1, Stefan Kunkemöller1, Agustinus Agung Nugroho2, Russell Ewings3, Yvan Sidis4, Astrid Schneidewind5, Paul Steffens6, and Markus Braden1 — 1II. Phys. Institut, Universität zu Köln — 2Institut Teknologi Bandung, Bandung 40132, Indonesia — 3ISIS Pulsed Neutron and Muon Source, United Kingdom — 4Laboratoire Léon Brillouin, Gif-sur-Yvette CEDEX, France — 5Jülich Centre for Neutron Science (JCNS), Garching, Germany — 6Institut Laue Langevin, Grenoble, France
Weyl points in the ferromagnetic state in SrRuO3 not only determine anomalous magnetotransport properties but also modify the spin dynamics leading to a peculiar temperature dependence of both the spin gap and of the stiffness in the ferromagnetic state [1]. In contrast the magnon chirality in SrRuO3 remains normal, i.e. right handed [2]. To extend the analysis of the magnon dispersion we performed inelastic neutron scattering experiments with the time-of-flight technique as well as with polarization analysis. The magnon dispersion can be followed to about 30 meV and there is no indication for a crossover into a Stoner continuum. There is evidence for additional coupling beyond just the nearest neighbors. In addition magnon excitations exhibit pronounced broadening that further increases upon heating possibly related to the strong coupling between ferromagnetism and conductivity in SrRuO3.
[1] K. Jenni et al. Phys. Rev. Lett. 123, 17202 (2019). [2] K. Jenni et al. Phys. Rev. B. 105, L180408 (2022).