Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 54: Correlated Electrons: Complex Oxides and Other Materials
TT 54.6: Vortrag
Donnerstag, 4. April 2019, 10:45–11:00, H22
Bond and magnetic order in rare-earth nickelates simultaniously probed by resonant inelastic x-ray scattering — •Katrin Fürsich1, Yi Lu1, 2, Davide Betto1, Georg Christiani1, Eva Benckiser1, Giniyat Khaliullin1, Matteo Minola1, and Bernhard Keimer1 — 1Max Planck Insitutte for Solid State Research, Stuttgart — 2University of Heildelberg
We used high-resolution resonant inelastic x-ray scattering (RIXS) at the Ni L3 edge to simultaneously
investigate bond and magnetic order in the rare-earth nickelates RNiO3. With the support of
calculations based on a double-cluster model, we quantify bond order (BO) amplitudes for different
thin flms and heterostructures, and discriminate short-range BO type fluctuations from long-range
static order. Moreover we investigate the magnetic order in spatially confined nickelate layers following
the method described in Ref. 1. While our study reveals a robust non-collinear spin spiral
magnetic order, which is essentially unperturbed by bond order modulations and spatial confinement,
we find a dramatically reduced magnon energy in systems with collinear magnetic order.
These results give valuable insight into the interplay of different collective ordering phenomena in a
prototypical 3d transition metal oxide and establish RIXS as tool of choice to quantitatively study
several order parameters within one experiment.
Lu, Betto, KF et al., Phys. Rev. X 8, 031014 (2018)