Magnetic Ordering of the Edge-Sharing CuO₂ Chains inCa₂Y₂Cu₅O₁0

Abstract

A neutron powder diffraction study revealed thatCa₂Y₂Cu₅O₁₀, which consists of edge-sharingCuO₂ chains, shows an antiferromagnetic long-range orderingbelow --29, K. The arrangement of the Cu²⁺ spins isferromagnetic along the chain (a axis) with a spin directionalong the b axis. The magnetic structure has the propagation vectork = [001]. The ordered moment ofthe Cu²⁺ spins is --0.9, μ_B at 10, K, suggesting thatthe interchain interactions are fairly large. The observed intensitiescan be better described by assuming an ordering of oxygen momentswhich are induced due to the strong hybridization between thecopper and oxygen ions.