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Combining microscopic and macroscopic probes to untangle the single-ion anisotropy and exchange energies in an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math> quantum antiferromagnet
The magnetic ground state of the quasi-one-dimensional spin-1 antiferromagnetic chain is sensitive to the relative sizes of the single-ion anisotropy $(D)$ and the intrachain $(J)$ and interchain $({J}^{\ensuremath{'}})$ exchange interactions. The ratios $D/J$ and ${J}^{\ensuremath{'}}/J$ dictate the material's placement in one of three competing phases: a Haldane gapped phase, a …