NMR Evidence of Antiferromagnetic Spin Fluctuations in Nd$_{0.85}$Sr$_{0.15}$NiO$_2$

Despite the recent discovery of superconductivity in Nd $_{1 - x}$ Sr $_{x}$ NiO $_{2}$ thin films, the absence of superconductivity and antiferromagnetism in their bulk materials remain a puzzle. Here we report the $^{1}$ H NMR measurements on powdered Nd $_{0.85}$ Sr $_{0.15}$ NiO $_{2}$ samples by taking advantage of the enriched proton concentration after hydrogen annealing. We find a large full width at half maximum of the spectrum, which keeps increasing with decreasing the temperature and exhibits an upturn behavior at low temperatures. The spin-lattice relaxation rate $1 /^{1} T_{1}$ is strongly enhanced when lowering the temperature, developing a broad peak at about 40 K, then decreases following a spin-wave-like behavior $1 /^{1} T_{1} \sim T^{2}$ at lower temperatures. These results evidence a short-range glassy antiferromagnetic ordering of magnetic moments below 40 K and dominant antiferromagnetic fluctuations extending to much higher temperatures. Our findings reveal the strong electron correlations in bulk Nd $_{0.85}$ Sr $_{0.15}$ NiO $_{2}$ , and shed light on the mechanism of superconductivity observed in films of nickelates.

NMR Evidence of Antiferromagnetic Spin Fluctuations in Nd $_{0.85}$ Sr $_{0.15}$ NiO $_{2}$

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NMR Evidence of Antiferromagnetic Spin Fluctuations in Nd $_{0.85}$ Sr $_{0.15}$ NiO $_{2}$

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NMR Evidence of Antiferromagnetic Spin Fluctuations in Nd0.850.85​Sr0.150.15​NiO22​

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NMR Evidence of Antiferromagnetic Spin Fluctuations in Nd0.850.85​Sr0.150.15​NiO22​

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NMR Evidence of Antiferromagnetic Spin Fluctuations in Nd $_{0.85}$ Sr $_{0.15}$ NiO $_{2}$

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NMR Evidence of Antiferromagnetic Spin Fluctuations in Nd $_{0.85}$ Sr $_{0.15}$ NiO $_{2}$

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