A breathing pyrochlore system is predicted to host a variety of quantum spin liquids. Despite tremendous experimental and theoretical efforts, such sought-after states remain elusive as perturbation terms and lattice distortions lead to magnetic order. Here, we utilize bond alternation and disorder to tune a magnetic ground state in the Cr-based breathing pyrochlore LiGa_1−xIn_xCr₄O₈. By combining thermodynamic and magnetic resonance techniques, we provide experimental signatures of a spin-liquid-like state in x = 0.8, namely, a nearly T²-dependent magnetic specific heat and persistent spin dynamics by muon spin relaxation (μSR). Moreover, ⁷Li NMR, ZF-μSR, and ESR unveil the temporal and thermal dichotomy of spin correlations: a tetramer singlet on a slow time scale vs. a spin-liquid-like state on a fast time scale. Our results showcase that a bond disorder in the breathing pyrochlore offers a promising route to disclose exotic magnetic phases.

预计呼吸中的烧绿石系统会容纳多种量子自旋液体。尽管进行了大量的实验和理论上的努力，但由于微扰项和晶格畸变导致了磁阶，因此这种追捧的状态仍然难以捉摸。在这里，我们利用键的交替和无序来调整Cr基呼吸性烧绿石LiGa _{1- x} In _x Cr ₄ O _8中的磁性基态。通过将热力学和磁共振技术相结合，我们提供了x  = 0.8时类似自旋液体状态的实验特征，即近似T ²依赖的磁比热和通过μ子自旋弛豫（μSR）。此外，⁷栗NMR，ZF- μ SR，和ESR自旋公布相关的时间和热二分法：一个缓慢的时间尺度的四聚体单相对于旋涂液体状在快速时间标度的状态。我们的结果表明，呼吸烧绿石中的键合紊乱为揭示外来磁性相提供了一种有希望的途径。