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We report muSR experiments on Mg{x}Cu{4-x}(OH)6Cl2 with x \sim 1, a newmaterial isostructural to Herbertsmithite exhibiting regular kagome planes ofspin 1/2 (Cu^{2+}), and therefore a candidate for a spin liquid ground state.We evidence the absence of any magnetic ordering down to 20 mK (\sim J/10^4).We investigate in detail the spin dynamics on well characterized samples inzero and applied longitudinal fields and propose a low T defect basedinterpretation to explain the unconventional dynamics observed in the quantumspin liquid phase.

Spin Liquid Ground State in the Frustrated Kagome Antiferromagnet MgCu3(OH)6Cl2