Abstract
Abstract The in-plane spin order of MnCl 2 GIC with a mixture of stage-1 and stage-2 has been studied in the temperature range between 63 mK and 30 K by means of elastic neutron scattering. The magnetic Bragg reflections are observed below 7.5 K at the in-plane wavevector Q ∥ = { k i } and { a ∗ ± k i } where a ∗ is the where a ∗ is the in-plane reciprocal lattice vector of MnCl 2 layers and k i ( i = 1, 2) is the reciprocal lattice vector of the in-plane spin structure: ¦ a ∗ ¦ = 1.965 A −1 . This incommensurate in-plane spin structure occurs as a result of competition between ferromagnetic nearest neighbor (NN) intraplanar exchange interaction, and antiferromagnetic second and third NN interactions.
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