Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 49: Focus Session: Higher-Order Magnetic Interactions – Implications in 2D and 3D Magnetism II
MA 49.6: Talk
Thursday, March 19, 2020, 16:30–16:45, HSZ 04
Hole doped 214-nickelate: A case study of spin dynamics in 3D-DCSS — •Rajesh Dutta1,3 and Avishek Maity2,3 — 1Institut für Kristallographie, RWTH Aachen University — 2Technical University of Munich, Germany — 3Heinz Maier-Leibnitz Zentrum, FRM-II, Garching)
Inelastic neutron scattering study on the magnetic excitation in a stripe-ordered Pr2-xSrxNiO4 at 5K reveal that dynamics are manifested by order magnetic incommensurability as result of admixing 1/3-stripe with the checkerboard matrix in NiO2 plane so called discommensurated spin stripe (DCSS). A suggested linear spin-wave model accounting 3D- DCSS with two-fold exchange interactions between Ni2+ spins, provides a good agreement with the measured spin wave dispersion up to 64 meV, notably, to describe a slight symmetric shift of the broadened peak in the energy range of 35 - 45 meV. Our results indicate that DCSS model is essential to consolidate in the LSWT calculation to understand the microscopic effect of doped holes on the spin microstructure.