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

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.

Major rewriting and inclusion of new experimental data 30 pages, 14 figures

References in corpus (5)

• Four-point renormalized coupling constant and Callan-Symanzik beta-function in O(N) models
• An experimental measurement of the staggered magnetization curve for a Haldane spin chain
• Coexistence of Haldane gap excitations and long range antiferromagnetic order in mixed-spin nickelates R_2 Ba Ni O_5
• Universal Behavior of One-Dimensional Gapped Antiferromagnets in Staggered Magnetic Field
• Effective potential in three-dimensional O(N) models

Cited by in corpus (13)

• Magnetic light scattering in low-dimensional quantum spin systems
• Polarized-neutron study of longitudinal Haldane-gap excitations in Nd${}_2$BaNiO${}_5$
• Heisenberg Spin-One Chain in Staggered Magnetic Field : A Density Matrix Renormalization Group Study
• Magnetic Double Structure for S=1, 1/2 Mixed-Spin Systems
• Spin-1 Antiferromagnetic Heisenberg Chains in an External Staggered Field
• Heisenberg Necklace Model in Magnetic Field
• A microscopic model for a class of mixed-spin quantum antiferromagnets
• Anomalous percolation and quantum criticality in diluted rare-earth nickelates
• Low-Temperature Properties of Quasi-One-Dimensional Molecule-Based Ferromagnets
• Effects of substituting rare-earth ion R by non-magnetic impurities in $R_{2}BaNi{O}_5$ - theory and numerical DMRG results
• Quantum and classical dynamics in complex one-dimensional antiferromagnets
• Effect of a Staggered Magnetic Field on the S=1 Haldane Chain with Single-ion Anisotropy
• Schwinger-Boson Mean-Field Theory of Mixed-Spin Antiferromagnet $L_{2}BaNi{O}_5$