Abstract
Neutron scattering experiments performed on single crystals of NdBa 2Cu 3O 6.1 reveal antiferromagnetic order for T < T N = (385 ± 2) K in which the structure is characterized by the magnetic wave vector ( 1 2 , 1 2 , 1 2 ) . The magnetic intensities are accounted for by Cu 2+ spins coupled antiferromagnetically in the CuO 2 planes. The oxygen-deficient layers exhibit a small staggered magnetization ϵ S which induces the spin ordering - S, -ϵ S, - S, + S, +ϵ S, + S, along the tetragonal axis. The average staggered magnetization evaluated at room temperature is about 0.40μ B in the CuO 2 planes and about 0.04μ B in the oxygen-deficient layers.
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