Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 3: Complex Oxides: Bulk Properties (jointly with DS, HL, KFM, MA, O) (joint session TT/HL/MA)

MA 3.4: Talk

Monday, March 16, 2020, 10:15–10:30, HSZ 201

Interplay of Electronic and Spin Degrees in Ferromagnetic SrRuO₃: Anomalous Softening of the Magnon Gap and Stiffness — •Kevin Jenni¹, Stefan Kunkemöller¹, Daniel Brüning¹, Thomas Lorenz¹, Yvan Sidis², Astrid Schneidewind³, Augustinus Agung Nugroho⁴, Achim Rosch⁵, Daniil Iljitsch Khomskii¹, and Markus Braden¹ — ¹II. Physikalisches Institut, Universität zu Köln, Deutschland — ²Laboratoire Leon Brillouin, Grenoble, Frankreich — ³JCNS, Forschungszentrum Jülich, Garching, Deutschland — ⁴Institut Teknologi Bandung, Indonesien — ⁵Institut für Theoretische Physik, Universität zu Köln, Deutschland

We succeeded to grow large single crystals of SrRuO₃ using the floating-zone technique [1,2]. The first inelastic neutron scattering study of the spin dynamics on single crystals yields the expected quadratic spin wave dispersion of a ferromagnet. However the magnon gap and stiffness considerably deviate from an earlier inelastic neutron scattering study on powders [3]. In addition we find a non-monotonous temperature dependence of the anisotropy gap and a softening of the magnon stiffness upon cooling. We discuss how Weyl points caused by SOC in SrRuO₃ couple electronic and spin degrees of freedom and how this interplay leads to the characteristic behavior in the spin dynamics [4].

[1] S. Kunkemöller et al., Chrys. Res Tec. 51, 299 (2016)

[2] S. Kunkemöller et al., PRB 96, 220406(R) (2017)

[3] S. Itoh et al., Nat. Commun. 7, 11788 (2016)

[4] K. Jenni et al., Phys. Rev. Lett. 123, 017202 (2019)