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首页> 外文期刊>Physical review >Quantum critical behavior in the highly random system Tl_(1-x)K_xCuCl_3 probed by zero- and longitudinal-field muon spin relaxation measurements
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Quantum critical behavior in the highly random system Tl_(1-x)K_xCuCl_3 probed by zero- and longitudinal-field muon spin relaxation measurements

机译:通过零场和纵场μ子自旋弛豫测量探测高随机系统Tl_(1-x)K_xCuCl_3中的量子临界行为

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摘要

Zero- and longitudinal-field muon-spin-relaxation (LF-μSR) measurements were carried out on the randomness-introduced quantum spin system Tl_(1-x)K_xCuCl_3. The relative temperature change in the muon-spin-relaxation rate λ in longitudinal-fields, which corresponds to the wave-vector integration of the generalized dynamical susceptibility, was deduced from LF-μSR measurements. Peak structure in the relative temperature change of λ for x=0.60 is observed at T~3 K in 3950 G, and the temperature where the peak is observed decreases with decreasing the magnetic field. This behavior is interpreted as the soft mode of spin waves in the vicinity of the quantum critical point.
机译:在引入了随机性的量子自旋系统Tl_(1-x)K_xCuCl_3上进行了零场和纵场μ自旋弛豫(LF-μSR)测量。从LF-μSR测量值推导得出纵向场中的μ轴自旋弛豫率λ的相对温度变化,其对应于广义动态磁化率的波矢量积分。在3950 G中,在T〜3 K处观察到x = 0.60时λ的相对温度变化的峰结构,并且随着磁场的减小,观察到峰的温度降低。这种行为被解释为量子临界点附近的自旋波的软模式。

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