【摘 要】
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Despite the recent discovery of superconductivity in Nd1-xSrxNiO2 thin films,the absence of superconductivity and antiferromagnetism in their bulk materials rem
【机 构】
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Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nan
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Despite the recent discovery of superconductivity in Nd1-xSrxNiO2 thin films,the absence of superconductivity and antiferromagnetism in their bulk materials remains a puzzle.Here we report the 1H NMR measurements on powdered Nd0.85Sr0.15NiO2 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 1T1-1 is strongly enhanced when lowering the temperature,developing a broad peak at about 40 K,then decreases fol-lowing a spin-wave-like behavior 1T1-1 ∝ T2 at lower temperatures.These results evidence a short-range glassy antiferromagnetic ordering of magnetic moments below 40 K and dominant antiferromagnetic fluctuations extend-ing to much higher temperatures.Our findings reveal the strong electron correlations in bulk Nd0.ssSr0.15NiO2,and shed light on the mechanism of superconductivity observed in films of nickelates.
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