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Mar 20 – 23, 2023
Campus Garching
Europe/Berlin timezone

INS study of spin stripe fluctuations in antiferromagnetic Pr2−xSrxNiO4+δ

Mar 21, 2023, 4:00 PM
2h
Yards 4 - 6 (Fakultät für Maschinenwesen)

Yards 4 - 6

Fakultät für Maschinenwesen

Board: TU-140
Poster Magnetism, Superconductivity, Topological Systems, Magnetic Thin Films an other electronic phenomena Poster session TUESDAY

Speaker

Avishek Maity

Description

Spin and charge stripe correlations and their dynamics have been well explored in the ordered state of La-based 214-nickelates for last 3 decades. Recently, we have also explored magnetic excitations in the ordered spin-stipes phases of hole-doped Pr-based nickelates Pr$_{2-x}$NiSrO$_{4+\delta}$ [1-3]. 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$_{2−x}$Sr$_{x}$NiO$_{4+\delta}$ with magnetic incommensurability ϵ= 0.33 above the spin stripe ordering temperature T$_{so}$ = 190 K [4]. The spin stripe fluctuations measured 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 that the presence of static charge stripe order is essential for the spin stripe fluctuations in 214-type nickealtes.

References:
[1] A. Maity et al., Physical Review Letters 124, 147202 (2020).
[2] R. Dutta et al., Physical Review B 102, 165130 (2020).
[3] A. Maity et al., Physical Review B (Letter) 103, L100401 (2021).
[4] A. Maity et al., Physical Review B 106, 024414 (2022).

Primary author

Co-authors

Dr Rajesh Dutta (Institut für Kristallographie, RWTH Aachen University) Werner Paulus (ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France)

Presentation materials

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