Neutron powder diffraction and magnetic measurements on CsMnI3 |
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Authors: | HW Zandbergen |
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Institution: | Gorlaeus Laboratories, University of Leiden, P.O. Box 9502, 2300 RA Leiden, The Netherlands |
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Abstract: | Results of neutron powder diffraction and magnetic measurements on single crystals of CsMnI3 are reported. Three-dimensional ordering takes place at Tc = 11.1(3) K. Above Tc very broad peaks occur in the neutron powder diffraction diagram, indicating one-dimensional correlations along the chain. Below Tc the Mn2+ ions are coupled antiferromagnetically along the chain. Interchain exchange leads to a 120° structure, slightly distorted due to anisotropy. One-third of the chains have their magnetic moment parallel to the c axis and the rest of the chains have magnetic moments making an angle of 50(2)° with the c axis. The magnetic moment as found from neutron diffraction extrapolated to 0 K is 3.7(1)μB, indicating a considerable zero-point spin reduction. The intrachain exchange was found to be ?9.1(1)K, whereas the ratio of the inter- to intrachain interaction was determined as . A spin flop occurs at H = 54 kOe on application of a magnetic field parallel to the c axis. When a field perpendicular to the c axis is applied a spin reorientation occurs at 1 kOe. |
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