Magnetic Structure of CsCoCl<SUB>3</SUB>

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  • Mekata Mamoru
    Department of Chemistry, Faculty of Science, Kyoto University
  • Adachi Kimio
    Department of Chemistry, Faculty of Science, Kyoto University

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  • Magnetic Structure of CsCoCl3

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Abstract

Neutron diffraction measurements were carried out on single crystals of CsCoCl3, a quasi-one-dimensional antiferromagnet of Ising-like spins, in the long range ordered region. The determined magnetic structure at 4.2 K is composed of antiferromagnetic stacking of ferrimagnetic c-plane with three sublattices as determined by Melamud et al. The spins are aligned along c-axis and were evaluated to be 3.11 μB at 0 K by extrapolation. Unusual temperature dependence of magnetic reflection intensity was observed and interpreted as a partial disordering transition in which one of the three sublattices in a c-plane loses its magnetization above 13.5 K resulting in antiferromagnetic c-planes. This transition is discussed in connection with the antiferro-ferrimagnetic transition in the triangular Ising lattice. The critical exponent of the magnetization was found to be 0.34 around the Néel temperature 20.82 K.

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