We report a comprehensive ${}^{139}\mathrm{La}$ and ${}^{63}\mathrm{Cu}$ nuclear magnetic resonance study on ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_x{\mathrm{CuO}}_4$ $\left(0.07\le x\le 0.2\right)$ single crystals. The ${}^{139}\mathrm{La}$ spin-lattice relaxation rate ${}^{139}\mathrm{T}_1^{-1}$ is drastically influenced by Sr doping $x$ at low temperatures. A detailed field dependence of ${}^{139}\mathrm{T}_1^{-1}$ at $x=1/8$ suggests that charge ordering induces the critical slowing down of spin fluctuations toward glassy spin order and competes with superconductivity. On the other hand, the ${}^{63}\mathrm{Cu}$ relaxation rate ${}^{63}\mathrm{T}_1^{-1}$ is well described by a Curie-Weiss law at high temperatures, yielding the Curie-Weiss temperature $\mathrm{\Theta }$ as a function of doping. $\mathrm{\Theta }$ changes sharply through a critical hole concentration $x_c\sim 0.09$. $x_c$ appears to correspond to the delocalization limit of doped holes, above which the bulk nature of superconductivity is established.

中文翻译：

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La139和Cu63核磁共振揭示了La2-xSrxCuO4（0.07≤x≤0.2）中的低能自旋动力学和临界孔浓度

我们报告全面 ${}^{139}\mathrm{啦啦}$ 和 ${}^{63}\mathrm{铜}$ 核磁共振研究 ${\mathrm{啦啦}}_{\mathrm{2个}-X}{r}_X{\mathrm{氧化铜}}_4$ $（0.07\le X\le 0.2）$单晶。这${}^{139}\mathrm{啦啦}$ 自旋晶格弛豫率 ${}^{139}\mathrm{Ť}_{\mathrm{1个}}^{-\mathrm{1个}}$ 受Sr掺杂的影响很大 $X$在低温下。详细的字段依存关系${}^{139}\mathrm{Ť}_{\mathrm{1个}}^{-\mathrm{1个}}$ 在 $X=\mathrm{1个}/8$这表明电荷有序诱导了自旋起伏向玻璃状自旋有序的严重减慢，并与超导电性竞争。另一方面，${}^{63}\mathrm{铜}$ 松弛率 ${}^{63}\mathrm{Ť}_{\mathrm{1个}}^{-\mathrm{1个}}$ 由居里-魏斯定律在高温下很好地描述，得出居里-魏斯温度 $\mathrm{\Theta }$ 作为掺杂的功能。 $\mathrm{\Theta }$ 通过临界孔浓度急剧变化 $X_C〜0.09$。 $X_C$ 似乎对应于掺杂空穴的离域极限，在该极限之上建立了超导的整体性质。