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Multistage spin correlations in the \\(s\\) = 1/2 stuffed hyper-star lattice Li\\(_{2}\\)Cu\\(_{2}\\)(MoO\\(_{4}\\))\\(_{3}\\)
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Multistage spin correlations in the \\(s\\) = 1/2 stuffed hyper-star lattice Li\\(_{2}\\)Cu\\(_{2}\\)(MoO\\(_{4}\\))\\(_{3}\\)
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Paper
Multistage spin correlations in the \\(s\\) = 1/2 stuffed hyper-star lattice Li\\(_{2}\\)Cu\\(_{2}\\)(MoO\\(_{4}\\))\\(_{3}\\)
2026
Overview
Star lattice, which can be visualized as a honeycomb network with each vertex replaced by a triangle, provides a rare platform for realizing exotic quantum states such as quantum spin liquids and disorder-driven random-singlet (RS) states. Herein, we investigate the ground-state properties of the three-dimensional (3D) stuffed hyper-star lattice Li\\(_2\\)Cu\\(_2\\)(MoO\\(_4\\))\\(_3\\), which exhibits a crossover from short-range spin correlations to a disorder-driven RS-like state below \\(T^{*}\\sim\\)15.8 K. Thermodynamic and microscopic measurements capture this crossover through a change in the power-law behavior of various observables, from \\(\\sim T^{0.25}\\) for \\(T > T^{*}\\) to \\(\\sim T^{-0.50}\\) for \\(T < T^{*}\\). Upon further cooling, a quasi-frozen state emerges near \\(T_{\\rm f} = 0.32\\) K, likely associated with weakly coupled spin chains within the hyper-star spin network. Our results underscore the crucial role of orphan spins and weak residual interactions in stabilizing a disorder-driven quantum-disordered state in 3D.
Publisher
Cornell University Library, arXiv.org
Subject
