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Magnetic ground state of the two isostructual polymeric quantum magnets<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>[</mml:mo><mml:mi>Cu</mml:mi><mml:mo>(</mml:mo><mml:msub><mml:mi>HF</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mo>)</mml:mo><mml:mo>(</mml:mo><mml:mtext>pyrazine</mml:mtext><mml:msub><mml:mo>)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:mo>]</mml:mo><mml:msub><mml:mi>SbF</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998…
The magnetic ground state of two isostructural coordination polymers, (i) the quasi-two-dimensional $S=1/2$ square-lattice antiferromagnet $[\mathrm{Cu}({\mathrm{HF}}_{2})({\mathrm{pyrazine})}_{2}]{\mathrm{SbF}}_{6}$ and (ii) a related compound $[\mathrm{Co}({\mathrm{HF}}_{2})({\mathrm{pyrazine})}_{2}]{\mathrm{SbF}}_{6}$, was examined with neutron powder diffraction measurements. We find that the ordered moments of the Heisenberg $S=1/2$ Cu(II) ions in $[\mathrm{Cu}({\mathrm{HF}}_{2})({\mathrm{pyrazine})}_{2}]{\mathrm{SbF}}_{6}$ are $0.6(1){\ensuremath{\mu}}_{b}$, while the ordered moments for …