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

Abstract

We report a comprehensive ${}^{139}$La and ${}^{63}$Cu nuclear magnetic resonance study on La${}_{2-x}$Sr${}_x$CuO${}_4$ ($0.07\le x\le 0.2$) single crystals. The ${}^{139}$La spin-lattice relaxation rate ${}^{139}{T}_1^{-1}$ is drastically influenced 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 critical slowing down of spin fluctuations toward glassy spin order and competes with superconductivity. 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 which the bulk nature of superconductivity is established.

arXiv comment7 pages, 4 figure, published in PRB

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Cited by in corpus (5)

• Hidden magnetism at the pseudogap critical point of a high temperature superconductor
• ${}^{139}$La NMR investigation of the interplay between the lattice, charge, and spin dynamics in charge ordered high $T_c$ cuprate La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$
• Distribution of the magnetic environment in charge ordered La${}_{1.885}$Sr${}_{0.115}$CuO${}_4$
• High magnetic field ultrasound study of spin freezing in La${}_{1.88}$Sr${}_{0.12}$CuO${}_4$
• Competition between spin ordering and superconductivity near the pseudogap boundary in La2-xSrxCuO4: insights from NMR