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

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

2002-03-08

arxiv.org/abs/cond-mat/0203187v1

Phys. Rev. Lett., 90, 147202 (2003).

Physics

Condensed Matter

Strongly Correlated Electrons

4 figures

Scientific paper

10.1103/PhysRevLett.90.147202

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: $\hbar c_s\sim 0.32$ eV \AA, 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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