Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.47: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Crystal structure and magnetic excitations of Sr4Ru3O10 — Zahrasadat Ghazinezhad1, •Lara Kiefer1, Augustinus Agung Nugroho2, Paul Steffens3, Ursula Bengaard Hansen3, and Markus Braden1 — 1II. Physic. Inst., Univ. Cologne, Germany — 2Institut Teknologi Bandung, Indonesia — 3ILL, Grenoble, France
Large single-crystals of the triple layer ruthenate Sr4Ru3O10 were grown by the floating zone technique in a mirror image furnace and characterized by X-ray diffraction, magnetization and resistance measurements. Comprehensive single-crystal X-ray diffraction studies reveal that the spacegroup is orthorhombic Bbcm and not Pbam, mostly used to describe the structure of Sr4Ru3O10 [1]. RuO6 octahedra are rotated around the axis perpendicular to the layers, but there is no additional tilting. The onset of ferromagnetic order at 105 K and the low-temperature ordered moment of 1.3 µB agree with earlier reports. The magnon dispersion was studied on the triple-axis spectrometers IN20 and Thales at the ILL. We find a parabolic isotropic dispersion with a stiffness constant that is comparable to that observed in the 3D material SrRuO3 [2]. However, the detailed distribution of spin-wave scattering at low constant energy transfer deviates from the simple isotropic ring expected in the most simple model and the stiffness tends to increase upon heating again resembling the behavior in SrRuO3 [2]. The spin-wave gap exhibits a rather anomalous temperature dependency with a strong increase upon cooling below 60 K.
[1] M. K. Crawford et al., Phys. Rev. B 65, 214412 (2002).
[2] K. Jenni et al., Phys. Rev. Lett. 123, 017202 (2019).
Keywords: ruthenate; neutron scattering; structure determination