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Large easy-axis anisotropy in the one-dimensional magnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>BaMo</mml:mi><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>PO</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
We present an extensive experimental and theoretical study on the low-temperature magnetic properties of the monoclinic anhydrous alum compound $\mathrm{BaMo}{({\mathrm{PO}}_{4})}_{2}$. The magnetic susceptibility reveals strong antiferromagnetic interactions ${\ensuremath{\theta}}_{CW}=\ensuremath{-}167\phantom{\rule{4pt}{0ex}}\mathrm{K}$ and long-range magnetic order at ${T}_{N}=22\phantom{\rule{4pt}{0ex}}\mathrm{K}$, in agreement with a recent report. Powder neutron diffraction furthermore shows that the order is collinear, …