用零场μ子自旋弛豫（ZF-$μ$ SR）方法研究了无规性对量子自旋系统T1 $_{1-x}$ K PDMATHAAB CuCl $_3$（其中${\boldmath $ x $}$ = 0.44）的影响
The effect of randomness on the quantum spin system Tl$_{1-x}$K$_x$CuCl$_3$ with ${\boldmath $x$}$ = 0.44 studied by the Zero-field Muon-Spin-Relaxation (ZF-$μ$SR) method
摘要：
零场μ子自旋弛豫（ZF-{ \boldmath $μ$ }SR）测量在$x$ = 0.44的无规键系统Tl $_{1-x}$ K $_x$ CuCl $_3$上进行低至80 mK。时间谱与拉伸指数函数$\exp (-λt)^β$拟合良好。μ子自旋弛豫率$λ$随着温度的降低而迅速增加，$β$在80 mK时趋于0.5。$λ$的发散增加表明Cu-3{ \it d}自旋涨落的频率在80 mK以下向自旋冻结态临界减慢，时间谱的根指数样行为表明弛豫的起源可能是空间固定的波动稀释时刻。
英文摘要：
Zero-field muon-spin-relaxation (ZF-{\boldmath $μ$}SR) measurements were carried out down to 80 mK on the randomness bond system Tl$_{1-x}$K$_x$CuCl$_3$ with $x$ = 0.44. Time spectra are well fitted by the stretched exponential function $\exp (-λt)^β$. The muon spin relaxation rate $λ$ increases rapidly with decreasing temperature, and $β$ tends to 0.5 at 80 mK. The divergent increase of $λ$ suggests the critical slowing down of the frequency of the Cu-3{\it d} spin fluctuations toward a spin frozen state below 80 mK, and the root-exponential-like behavior of the time spectrum indicates that the origin of the relaxation is possibly the spatially-fixed fluctuating dilute moments.
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