Microscopic Magnetism of Nickel-Based Infinite-Layer Superconducting Parent Compounds RNiO2 (R = La, Nd): A μSR Study

IF 3.5 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Physics Letters Pub Date : 2024-08-31 DOI:10.1088/0256-307x/41/9/097502

Qiong Wu, 琼吴, Ying Fu, 盈付, Le Wang, 乐王, Xuefeng Zhou, 雪峰周, Shanmin Wang, 善民王, Zihao Zhu, 子浩朱, Kaiwen Chen, 锴文陈, Chengyu Jiang, 程予姜, Toni Shiroka, Adrian D. Hillier, Jia-Wei Mei, 佳伟梅, Lei Shu and 蕾殳

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Abstract

By using muon spin relaxation (μSR) measurements, we perform a comparative study of the microscopic magnetism in the parent compounds of infinite-layer nickelate superconductors RNiO2 (R = La, Nd). In either compound, the zero-field μSR spectra down to the lowest measured temperature reveal no long-range magnetic order. In LaNiO2, short-range spin correlations appear below T = 150 K, and spins fully freeze below T ∼ 10 K. NdNiO2 exhibits a more complex spin dynamics driven by the Nd 4f and Ni 3d electron spin fluctuations. Further, it shows features suggesting the proximity to a spin-glass state occurring below T = 5 K. In both compounds, the spin behavior with temperature is further confirmed by longitudinal-field μSR measurements. These results provide new insight into the magnetism of the parent compounds of the superconducting nickelates, crucial to understanding the microscopic origin of their superconductivity.

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镍基无限层超导母化合物 RNiO2 (R = La, Nd) 的微观磁性：μSR研究

通过μ介子自旋弛豫（μSR）测量，我们对无限层镍酸盐超导体 RNiO2（R = La、Nd）母体化合物中的微观磁性进行了比较研究。在这两种化合物中，低至最低测量温度的零场 μSR 光谱显示没有长程磁序。在 LaNiO2 中，短程自旋相关性出现在 T = 150 K 以下，自旋完全冻结在 T ∼ 10 K 以下。在这两种化合物中，纵向场 μSR 测量进一步证实了自旋随温度变化的行为。这些结果为了解超导镍酸盐母体化合物的磁性提供了新的视角，对于理解其超导性的微观起源至关重要。

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来源期刊

Chinese Physics Letters 物理-物理：综合

CiteScore

5.90

自引率

8.60%

发文量

13238

审稿时长

4 months

期刊介绍： Chinese Physics Letters provides rapid publication of short reports and important research in all fields of physics and is published by the Chinese Physical Society and hosted online by IOP Publishing.