Regensburg 2022 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 39: Correlated Electrons: Charge Order
TT 39.1: Vortrag
Freitag, 9. September 2022, 11:15–11:30, H23
Stripe discommensuration and spin dynamics of charge and spin stripe ordered Pr3/2Sr1/2NiO4 — •Avishek Maity1, Rajesh Dutta2,3, and Werner Paulus4 — 1Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85747 Garching, Germany — 2Institut für Kristallographie, RWTH Aachen Universität, 52066 Aachen, Germany — 3Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), 85747 Garching, Germany — 4Institut Charles Gerhardt Montpellier, Université de Montpellier, 34095 Montpellier, France
Magnetic excitations in the charge and spin stripe ordered phases of La-based 214-nickelates have been vigorously explored using inelastic neutron scattering (INS) studies. In view of so far reported two-dimensional antiferromagnetic nature, out-of-plane interaction is not generally expected in 214-nickelates. Here we will present our results on the magnetic excitations of Pr3/2Sr1/2NiO4, with stripe incommensurability є = 0.4, showing a very compelling evidence for the presence of a sizable out-of-plane interaction (J⊥ ∼ 2.2 meV) manifesting a symmetrical outward shift of the spin wave dispersion from the antiferromagnetic zone center. Our linear spin wave calculation using an unconventional three-dimensional model of discommensurated spin stripe (DCSS) unit for є = 0.4 could explicitly show such outward shift results from the overlap of a mode originating exclusively from the out-of-plane interaction. Our study suggests that a careful consideration of the out-of-plane interaction is necessary in the stripe discommensurated 214-nickelates.
[1] A. Maity et al., PRL 124, 147202 (2020).