Magnetism study on a frustration-free spatially anisotropic S = 1 square lattice antiferromagnet Ni[SC(NH2)2]6Br2
Abstract
Magnetism of the S = 1 Heisenberg antiferromagnets on the spatially anisotropic square lattice has been scarcely explored. Here we report a study of the magnetism, specific heat, and thermal conductivity on Ni[SC(NH2)2]6Br2 (DHN) single crystals. Ni2+ ions feature an S = 1 rectangular lattice in the bc plane, which can be viewed as an unfrustrated spatially anisotropic square lattice. A long-range antiferromagnetic order is developed at T N = 2.23 K. Below TN, an upturn is observed in the b-axis magnetic susceptibility and the resultant minimum might be an indication for the XY anisotropy in the ordered state. A gapped spin-wave dispersion is confirmed from the temperature dependence of the magnetic specific heat. Anisotropic temperature-field phase diagrams are mapped out and possible magnetic structures are proposed.
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