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arXiv · 2209.07017

$^{75}$As NMR study of the antiferromagnetic Kondo lattice compound CeNiAsO

Fangjun Lu·Xiaobo He·Kangqiao Cheng·Zhuo Wang·Jian Zhang·Yongkang Luo
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Abstract

We revisit the magnetic properties of the antiferromagnetic Kondo lattice CeNiAsO by $^{75}$As nuclear magnetic resonance measurements. Our results confirm two successive antiferromagnetic transitions of Ce moments at $T_{N1}=9.0(3)$ K and $T_{N2}=7.0(3)$ K. Incommensurate and commensurate antiferromagnetic orders are suggested for $T_{N2}<T<T_{N1}$ and $T<T_{N2}$ respectively, consistent with previous neutron and muon experiments. A Knight shift anomaly, characterized by the failure of $K(T)-\chi(T)$ scaling, is observed below $T^*\sim15$ K, which gives a measure of the onset of coherent $c-f$ correlations. This energy scale is further confirmed by the spin-lattice relaxation rate ($1/T_1$). The analysis of spin dynamics also reveals a quasi-two-dimensional character of spin fluctuations in CeNiAsO. This work paves the way for further $^{75}$As nuclear magnetic resonance studies under pressure.

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Fangjun Lu, Xiaobo He, Kangqiao Cheng, Zhuo Wang, Jian Zhang, Yongkang Luo. 2022-09-15. $^{75}$As NMR study of the antiferromagnetic Kondo lattice compound CeNiAsO. https://doi.org/10.1103/physrevb.107.045104

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