Chin. Phys. Lett.  2021, Vol. 38 Issue (6): 067401    DOI: 10.1088/0256-307X/38/6/067401
NMR Evidence of Antiferromagnetic Spin Fluctuations in Nd$_{0.85}$Sr$_{0.15}$NiO$_2$
Yi Cui1†, Cong Li1†, Qing Li2†, Xiyu Zhu2, Ze Hu1, Yi-feng Yang3, Jinshan Zhang4, Rong Yu1*, Hai-Hu Wen2*, and Weiqiang Yu1*
1Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
2National Laboratory of Solid State Microstructures and Department of Physics, Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
3Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China
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Yi Cui, Cong Li, Qing Li et al  2021 Chin. Phys. Lett. 38 067401
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Abstract 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 remains 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 $T$ and exhibits an upturn behavior at low temperatures. The spin-lattice relaxation rate $^{1}T_1^{-1}$ is strongly enhanced when lowering the temperature, developing a broad peak at about 40 K, then decreases following a spin-wave-like behavior $^{1}T_1^{-1}\propto T^2$ 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.
Received: 21 March 2021      Published: 25 May 2021
PACS:  74.62.Dh (Effects of crystal defects, doping and substitution)  
  74.70.-b (Superconducting materials other than cuprates)  
  74.25.nj (Nuclear magnetic resonance)  
  74.25.-q (Properties of superconductors)  
Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 51872328, 11674392, 11774401, and A0402/11927809), the National Key R&D Program of China (Grant Nos. 2016YFA0300504 and 2016YFA0300401), China Postdoctoral Science Foundation (Grant No. 2020M680797), the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (Grant Nos. 18XNLG24, 20XNLG19, and 21XNLG18).
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Yi Cui
Cong Li
Qing Li
Xiyu Zhu
Ze Hu
Yi-feng Yang
Jinshan Zhang
Rong Yu
Hai-Hu Wen
and Weiqiang Yu
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