Spin dynamics in stripe-ordered La5/3Sr1/3NiO4
A.T. Boothroyd, D. Prabhakaran, P.G. Freeman, S.J.S. Lister, M., Enderle, A. Hiess, and J. Kulda
TL;DR
This study investigates spin excitations in stripe-ordered La5/3Sr1/3NiO4 using neutron scattering, revealing sharp magnetic modes and coupling to stripe domain wall motions, modeled by a linear spin wave theory.
Contribution
It provides detailed measurements of spin dynamics in stripe-ordered La5/3Sr1/3NiO4 and models the spectrum with specific exchange interactions.
Findings
Sharp magnetic modes characteristic of static stripe order
Exchange interactions J and J' quantified
Broadening suggests coupling to stripe domain wall motions
Abstract
Polarized and unpolarized neutron inelastic scattering has been used to measure the spin excitations in the spin-charge-ordered stripe phase of La5/3Sr1/3NiO4. At high energies, sharp magnetic modes are observed characteristic of a static stripe lattice. The energy spectrum is described well by a linear spin wave model with intra- and inter-stripe exchange interactions between neighbouring Ni spins given by J = 15 +/- 1.5 meV and J' = 7.5 +/- 1.5 meV respectively. A pronounced broadening of the magnetic fluctuations in a band between 10 meV and 25 meV is suggestive of coupling to collective motions of the stripe domain walls.
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