Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Magnetic Heuslers, Half-Metals, Semiconductors, and Oxides (organized by MA)
TT 23.4: Vortrag
Montag, 16. März 2015, 15:45–16:00, H 1012
Magnetic excitations in the anomalous ferromagnetic metal SrRuO3 — •Stefan Kunkemöller1, A. Agung Nugroho2, Yvan Sidis3, and Markus Braden1 — 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937, Germany — 2Faculty of Mathematics and Natural Sciences, Jl. Ganesa 10 Bandung, 40132, Indonesia — 3Laboratoire Léon Brillouin, CEA Saclay, F-91191 Gif sur Yvette Cedex, France
SrRuO3 is the infinite-layer perovskite of the Ruddlesden-Popper series of ruthenates. It exhibits ferromagnetic ordering and highly anomalous electronic properties. At Cologne University we could recently grow several SrRuO3 single-crystals with a mass of few grams each using a Canon Machinery image furnace. Inelastic neutron scattering experiments on the magnon dispersion were performed at the 2T thermal triple-axis spectrometer of the Laboratoire Léon Brillouin in Saclay. At intermediate energies and low temperature an isotropic magnon dispersion is observed as it is expected for a nearly cubic material. The magnon dispersion along the three main-symmetry directions of the pseudo-cubic material can be described by simple spin-wave theory with a gap of 1.7(2) meV and a magnetic stiffness constant of 95(5) meVÅ2. Strong magnon-like scattering is observed till 280 K and there is no evidence for essential softening of the dispersion across the magnetic ordering in contrast to any simple Heisenberg model.