Abstract
Powder neutron diffraction measurements were performed on RbNiCl 3 and CsNiCl 3 at temperatures above and below their respective Néel temperatures of 11°K and 4.5°K. The magnetic superlattice reflections for both compounds can be indexed on the basis of a hexagonal unit cell with dimensions a = 3 a 0 and c = c 0, where a 0 and c 0 are the dimensions of the chemical unit cell. The magnetic structure is found to consist of an antiferromagnetic sequence of the spins along the c axis chains, along with a screw spiral propagating in the basal plane. The wavelength of the screw spiral is commensurate with the lattice, and has a value of 3a 0 2 . Single crystal measurements on RbNiCl 3 have shown that for Γ ⪢ Γ n the compound exhibits scattering behavior that is characteristic of a one-dimensional magnetic system.
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