Abstract
We have studied magnetic correlations in several compositions of stripe-ordered La 2− x Sr x NiO 4. 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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