Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.105: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Spin density wave ordering in Ca0.5Sr21.5RuO4 studied by neutron scattering — •Stefan Kunkemöller1, 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, C.E.A./C.N.R.S., F-91191 Gif sur Yvette CEDEX, France
The families of layered ruthenates have attracted strong interest mostly due to the appearance of unconventional superconductivity in pure Sr2RuO4. The question wether the magnetic fluctuations are relevant for the superconducting pairing in Sr2RuO4 and if so which ones remains an interesting open issue. The spin density wave ordering in Ca0.5Sr1.5RuO4 is studied by polarized and unpolarized neutron diffraction experiments. It exhibits quasistatic correlations below 20 K at the incommensurate wave vector at which Sr2RuO4 shows strong inelastic fluctuations driven by Fermisurface nesting. The magnetic character of the signal and the orientation of the ordered moments along the c direction can be ascertained by neutron polarization analysis. The magnetic ordering at low temperatures is very similar to that found upon minor Ti doping of Sr2RuO4 underlining, that this incommensurate SDW is the dominant magnetic instability of the unconventional superconductor Sr2RuO4.