SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 51: Correlated Electrons: Charge Order

TT 51.8: Vortrag

Donnerstag, 30. März 2023, 17:00–17:15, HSZ 103

Spin stripe fluctuations in antiferromagnetic Pr_2−xSr_xNiO_4+δ — •Avishek Maity¹, Rajesh Dutta^2,3, 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 — ⁴ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France

Spin and charge stripe correlations and their dynamics have been well explored in the ordered state of RE−based 214-nickelates for last 3 decades. In this regards, what remains less explored is the fluctuating state of the spin stripes from which the long-range spin stripes develop on cooling. In this talk, we present our recent inelastic neutron scattering study of the low energy spin stripe fluctuations in Pr_2−xSr_xNiO_4+δ with magnetic incommensurability є = 0.33 above the spin stripe ordering temperature T_so = 190 K [1]. The spin stripe fluctuations measured at the at the incommensurate wave vector show a non-dispersive character with no detectable anisotropy persisting up to a maximum energy 10 meV, and strongly suppressed already below the charge stripe ordering temperature T_co = 255 K. Our results clearly indicate the presence of static charge stripe order is essential for the spin stripe fluctuations in 214-type nickealtes.
[1] A. Maity et al., Phys. Rev. B 106, 024414 (2022)