High-Energy Spin Dynamics in La${}_{1.69}$Sr${}_{0.31}$NiO${}_4$

Abstract

We have mapped out the spin dynamics in a stripe-ordered nickelate, La${}_{2-x}$Sr${}_x$NiO${}_4$ with $x\simeq 0.31$, using inelastic neutron scattering. We observe spin-wave excitations up to 80 meV emerging from the incommensurate magnetic peaks with an almost isotropic spin-velocity: $\hslash c_s\sim 0.32$ eV Å, very similar to the velocity in the undoped, insulating parent compound, La${}_2$NiO${}_4$. We also discuss the similarities and differences of the inferred spin-excitation spectrum with those reported in superconducting high-$T_c$ cuprates.

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References in corpus (6)

• Magnetic Resonant Mode in the Single-Layer High Temperature Superconductor Tl${}_2$Ba${}_2$Cu${}_{6+\delta }$
• Renormalized mean-field theory of the neutron scattering in cuprate superconductors
• Bond-Stretching-Phonon Anomalies in Stripe-Ordered La(1.69)Sr(0.31)NiO(4)
• Freezing of a Stripe Liquid
• Dispersion of the neutron resonance in cuprate superconductors
• Effective interactions in the stripe state of the two-dimensional Hubbard model

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