Inward dispersion of the spin excitation spectrum of stripe-ordered La2NiO4+d

Abstract

Polarized- and unpolarized-neutron scattering measurements of the spin excitation spectrum in the stripe-ordered phase of La2NiO4+d (d = 0.11) are presented. At low energies, the magnetic spectral weight is found to shift anomalously towards the two-dimensional antiferromagnetic wave vector, similar to the low-energy dispersions observed in cuprate superconductors. While spin-wave spectra in stripe phases can exhibit an apparent inward dispersion, we find that the peak shifts measured here cannot be accounted for by this effect. Possible extensions of the model are discussed.

7 pages, 6 figures; to be published in Phys. Rev. B

References in corpus (6)

• Lattice symmetry breaking in cuprate superconductors: Stripes, nematics, and superconductivity
• Spin dynamics in the pseudogap state of a high-temperature superconductor
• Two energy scales in the spin excitations of the high-T_c superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$
• Magnetic excitations in a bond-centered stripe phase: Spin waves far from the semi-classical limit
• Spin Waves in Striped Phases
• Magnetic Excitations of the Diagonal Incommensurate Phase in Lightly-Doped La2-xSrxCuO4

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• Pairing mechanism and superconductivity in pressurized La${}_5$Ni${}_3$O${}_{11}$