Dresden 2020 – wissenschaftliches Programm

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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: Vortrag

Montag, 16. März 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 Braden11II. 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)

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