Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Complex Magnetic Oxides
MA 3.7: Vortrag
Montag, 9. März 2026, 11:15–11:30, POT/0112
Magnetic structure and magnetic excitations of the triple layer Sr4Ru3O10 — •Lara Kiefer1, Zahrasadat Ghazinezhad1, Felix Wirth1, Jens Mettler1, Ursula Bengaard Hansen2, Paul Steffens2, Oksana Zaharko3, Vladimir Pomjakushin3, Karin Schmalzl4, Devashibhai Androja5, Augustinus Agung Nugroho6, and Markus Braden1 — 1Inst. Phys. 2, Cologne, Germany — 2ILL, Grenoble, France — 3PSI, Villingen, Switzerland — 4JCNS Out. ILL, Grenoble, France — 5ISIS, Didcot, UK — 6FMIPA ITB, Badung, Indonesia
The triple-layer transition-metal oxide Sr4Ru3O10 is a member of the Ruddlesden-Popper series with a layered orthorhombic structure. It is a ferromagnetic metal (TC=105 K) with an additional metamagnetic transition below 60 K. The nature of the intermediate phase is still under debate. Using multiple neutron diffraction techniques, we were able to determine its magnetic structure. Our inelastic neutron experiments revealed a parabolic, isotropic dispersion with a stiffness constant comparable to that of SrRuO3 [1,2]. However, the spin-wave scattering at low constant energy transfer deviates from the expected isotropic ring, and the stiffness increases upon heating, mirroring SrRuO3 [1,2]. Polarized neutron measurements reveal longitudinal spin excitations inside the ferromagnetic phase. These amplitude-type fluctuations are unexpected in a standard Heisenberg ferromagnet, suggesting the emergence of a new class of magnetic excitations beyond conventional transverse magnons. [1] K. Jenni et al., Phys. Rev. B 107, 174429 (2023). [2] K. Jenni et al., Phys. Rev. Lett. 123, 017202 (2019).
Keywords: Magnetic structure; Magnons; Polarised neutrons; Neutron diffraction; Neutron spectroscopy