Magnetic Order and Dynamics in Stripe-Ordered La2-xSrxNiO4
A.T. Boothroyd, P.G. Freeman, D. Prabhakaran, M. Enderle, and J. Kulda
TL;DR
This study uses polarized-neutron scattering to explore magnetic correlations, spin reorientation, anisotropy gaps, and spin-charge coupling in stripe-ordered La2-xSrxNiO4, revealing detailed magnetic dynamics.
Contribution
It demonstrates how polarization analysis can uncover key magnetic features and excitations in stripe-ordered nickelates, advancing understanding of their magnetic behavior.
Findings
Characterized a spin reorientation transition
Identified anisotropy gaps in spin excitations
Detected coupling between spin and charge excitations
Abstract
We have studied magnetic correlations in several compositions of stripe-ordered La2-xSrxNiO4. In this paper we show how polarized-neutron scattering has helped uncover important features of the magnetic ordering and spin dynamics. In particular, polarization analysis has enabled us (1) to characterize a spin reorientation transition, (2) to identify anisotropy gaps in the spin excitation spectrum, and (3) to investigate an anomalous dip in the spin-wave intensity suggestive of coupling between collective spin and charge excitations.
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