Magnetic ordering, spin waves, and Haldane gap excitations in (Nd_x Y_{1-x})_2 Ba Ni O_5 linear-chain mixed-spin antiferromagnets

TL;DR

This study investigates magnetic ordering, spin waves, and Haldane gap excitations in mixed-spin antiferromagnetic chains of (Nd_x Y_{1-x})_2 Ba Ni O_5 using neutron scattering, revealing temperature-dependent magnetic structures and excitations.

Contribution

It provides experimental insights into the magnetic excitations and structures in mixed-spin chains, confirming the 'Haldane chain in a staggered field' model with quantitative agreement.

Findings

Temperature-dependent magnetic structures identified.

Haldane-gap excitations observed and characterized.

Quantitative agreement with theoretical models achieved.

Abstract

Linear-chain nickelates with the composition (Nd_x Y_{1-x})_2 Ba Ni O_5 (x=1, x=0.75, x=0.5, and x=0.25) are studied in a series of neutron scattering experiments. Powder diffraction is used to determine the temperature dependence of the magnetic structure in all four systems. Single-crystal inelastic neutron scattering is employed to investigate the temperature dependence of the Haldane-gap excitations and low-energy spin waves in the x=1 compound Nd_2 Ba Ni O_5. The results of these experiments are discussed in the context of the ``Haldane chain in a staggered field'' model for R_2 Ba Ni O_5 systems, and quantitative agreement with theory is obtained.