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We report a comprehensive $^{139}$La and $^{63}$Cu nuclear magnetic resonancestudy on La$_{2-x}$Sr$_x$CuO$_4$ ($0.07\leq x \leq 0.2$) single crystals. The$^{139}$La spin-lattice relaxation rate $^{139}T_1^{-1}$ is drasticallyinfluenced by Sr doping $x$ at low temperatures. A detailed field dependence of$^{139}T_1^{-1}$ at $x=1/8$ suggests that charge ordering induces the criticalslowing down of spin fluctuations toward glassy spin order and competes withsuperconductivity. On the other hand, the $^{63}$Cu relaxation rate$^{63}T_1^{-1}$ is well described by a Curie-Weiss law at high temperatures,yielding the Curie-Weiss temperature $\Theta$ as a function of doping. $\Theta$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 whichthe bulk nature of superconductivity is established.

physical review. b./physical review. b

Low-energy spin dynamics and critical hole concentrations in  La$_{2-x}$Sr$_x$CuO$_4$ ($0.07\leq x \leq 0.2$) revealed by $^{139}$La and  $^{63}$Cu nuclear magnetic resonance