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

doi:10.1088/0256-307X/38/6/067401

Chin. Phys. Lett.

2021, Vol. 38

Issue (6): 067401 DOI: 10.1088/0256-307X/38/6/067401

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

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

Yi Cui^1†, Cong Li^1†, Qing Li^2†, Xiyu Zhu², Ze Hu¹, Yi-feng Yang³, Jinshan Zhang⁴, Rong Yu^1*, Hai-Hu Wen^2*, and Weiqiang Yu^1*

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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https://cpl.iphy.ac.cn/10.1088/0256-307X/38/6/067401 OR https://cpl.iphy.ac.cn/Y2021/V38/I6/067401

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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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