"Stripe discommensuration and spin dynamics in hole-doped 214-nickelates Pr2-xSrxNiO4+delta"

Aveshek Maity , Research Neutron Source Heinz Maier-Leibnitz (FRM II), Technical University of Munich, Garching, Germany
[Host: Despina Louca]

Magnetic excitations in the spin-stripe phases of La-based 214-nickelates have been vigorously explored using inelastic neutron scattering (INS) study for almost last three decades and still have remained an exciting research field, especially to understand their differences yet of their structural similarities with high-Tc 214-cuprates. In view of so far reported two-dimensional antiferromagnetic nature, out-of-plane magnetic excitations are generally not expected in 214-nickelates. In this talk, I will present our recent results from INS measurements on the stripe discommensurated phases of Sr-doped Pr3/2Sr1/2NiO4 samples, showing a compelling evidence for the presence of a sizable out-of-plane interaction suggesting a three-dimensional nature of magnetic excitations near the half-doped region [1,2]. The measured magnetic excitations are in good agreement with our linear spin wave (LSW) theory based calculations in the discommensurated spin stripe models. Additionally, I will discuss the effect of short-range vs. long-range spin stripe correlations on the spin wave dispersion by comparing the results with our INS study on an O-doped sample Pr2NiO4+δ [3].

Condensed Matter Seminar
Thursday, February 23, 2023
4:00 PM
via Zoom, Room TBA
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