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Magnetic Ground State of an Experimental<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:math>Kagome Antiferromagnet
We present a detailed analysis of the heat capacity of a near-perfect $S=1/2$ kagome antiferromagnet, zinc paratacamite ${\mathrm{Zn}}_{x}{\mathrm{Cu}}_{4\ensuremath{-}x}(\mathrm{OH}{)}_{6}{\mathrm{Cl}}_{2}$, as a function of stoichiometry $x\ensuremath{\rightarrow}1$ and for fields of up to 9 T. We obtain the heat capacity intrinsic to the kagome layers by accounting for the weak ${\mathrm{Cu}}^{2+}/{\mathrm{Zn}}^{2+}$ exchange between …