Abstract
Spin-1/2 maple-leaf lattice antiferromagnets are expected to show interesting phenomena originating from frustration effects and quantum fluctuations. We report the hydrothermal synthesis of a powder sample of bluebellite ${\mathrm{Cu}}_{6}\mathrm{I}{\mathrm{O}}_{3}{(\mathrm{OH})}_{10}\mathrm{Cl}$ as a first potential candidate. Magnetization and heat capacity measurements reveal moderate frustration with a Curie-Weiss temperature of $--35\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, and a magnetic transition at ${T}_{N}=17\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Surprisingly, the magnetic susceptibility and heat capacity above ${T}_{N}$ are well reproduced by the Bonner-Fisher model, which suggests that a one-dimensional spin correlation with a magnetic interaction of 25 K occurs in the apparently two-dimensional lattice. This emergent one-dimensionality cannot be explained by orbital ordering or dimensional reduction due to geometrical frustration. We believe that there is an unknown mechanism to cause one-dimensionality in the spin-1/2 maple-leaf lattice antiferromagnet.
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