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Negative-chirality order in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:math> kagome antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CdCu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>OH</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>6</mml:mn></mml:…
By the complementary combination of NMR and neutron diffraction measurements, and a symmetry analysis using the previously reported magnetization measurements, a negative-chirality $\mathbf{q}$=0 magnetic structure is successfully identified as the ground state of CdCu${}_{3}$(OH)${}_{6}$(NO${}_{3}{)}_{2}\ensuremath{\cdot}$H${}_{2}$O, the $S$=\textonehalf{} perfect kagome antiferromagnet. Detailed investigation of the internal fields leads the authors to suggest …