Abstract
Magnetization and neutron-diffraction measurements have been performed on single crystals of Ba 2Cu 3O 4Cl 2 and Sr 2Cu 3O 4Cl 2, isomorphous layered insulating cuprates containing two types of Cu-site in the Cu 3O 4 planes. Neutron-diffraction measurements revealed both three-dimensional antiferromagnetic order of Cu 2+ spins on one of the sites (A-site), which are connected by the Cu(A) O Cu(A) 180°-bonds, and successive order of the other site (B-site), which locates at the centre of the Cu(A)O 2 square. Magnetization measurements indicate an in-plane weak ferromagnetic moment below the Néel temperature T N due to spin canting within the Cu 3O 4 planes.
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