The spin-\(\frac{1}{2}\) kagome antiferromagnet is considered an ideal host for a quantum spin liquid (QSL) ground state. We find that when the bonds of the kagome lattice are modulated with a periodic pattern, new quantum ground states emerge. Newly synthesized crystalline barlowite (Cu₄(OH)₆FBr) and Zn-substituted barlowite demonstrate the delicate interplay between singlet states and spin order on the spin-\(\frac{1}{2}\) kagome lattice. Comprehensive structural measurements demonstrate that our new variant of barlowite maintains hexagonal symmetry at low temperatures with an arrangement of distorted and undistorted kagome triangles, for which numerical simulations predict a pinwheel valence bond crystal (VBC) state instead of a QSL. The presence of interlayer spins eventually leads to an interesting pinwheel q = 0 magnetic order. Partially Zn-substituted barlowite (Cu_3.44Zn_0.56(OH)₆FBr) has an ideal kagome lattice and shows QSL behavior, indicating a surprising robustness of the QSL against interlayer impurities. The magnetic susceptibility is similar to that of herbertsmithite, even though the Cu²⁺ impurities are above the percolation threshold for the interlayer lattice and they couple more strongly to the nearest kagome moment. This system is a unique playground displaying QSL, VBC, and spin order, furthering our understanding of these highly competitive quantum states.

自旋\（\ frac {1} {2} \） kagome反铁磁体被认为是量子自旋液体（QSL）基态的理想主体。我们发现，当kagome晶格的键以周期性模式进行调制时，就会出现新的量子基态。新合成的晶体重晶石（Cu ₄（OH）₆ FBr）和Zn取代的重晶石在自旋\（\ frac {1} {2} \）上显示了单重态与自旋顺序之间的微妙相互作用。舞果晶格。全面的结构测量表明，我们的新的重晶石变体在低温下保持扭曲的和未扭曲的kagome三角形排列，从而保持了六边形对称性，其数值模拟可预测风车价键晶体（VBC）的状态而不是QSL。层间自旋的存在最终导致有趣的风车q  = 0的磁阶。部分Zn取代的重晶石（Cu _3.44 Zn _0.56（OH）₆ FBr）具有理想的kagome晶格并显示QSL行为，表明QSL对层间杂质具有惊人的耐用性。即使Cu ²⁺，其磁化率也类似于铁长石。杂质高于层间晶格的渗滤阈值，并且它们更紧密地耦合到最近的kagome矩。该系统是一个显示QSL，VBC和自旋顺序的独特运动场，进一步加深了我们对这些竞争激烈的量子态的理解。