Abstract
Single crystals of were grown and characterized using neutron scattering and thermodynamic measurements. has long-range antiferromagnetic order below K and specific-heat measurements have demonstrated that a significant amount of the magnetic entropy is released above . Inelastic neutron scattering experiments reveal a magnetic mode(s) with little dispersion peaked at that is of greatest intensity below but persists above . This persistence of dynamic correlations is likely related to frustrated interactions associated with the nearly ideal stacked triangular lattice geometry of spins on ions. The magnetization is observed to be strongly anisotropic at all temperatures due to crystal field effects, with easy-plane anisotropy observed. A noncompensated magnetic structure is inferred from the temperature dependence of the magnetization when a magnetic field of sufficient strength is applied within the basal plane near , and the evolution of the long-range order is summarized in a temperature-field phase diagram.
6 More- Received 21 May 2020
- Revised 27 July 2020
- Accepted 5 August 2020
DOI:https://doi.org/10.1103/PhysRevB.102.054434
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