Microscopic magnetism of nickel-based infinite-layer superconducting parent compounds &lt;em&gt;R&lt;/em&gt;NiO&lt;sub&gt;2&lt;/sub&gt; (&lt;em&gt;R&lt;/em&gt; = La, Nd): a μSR study

Wu, Qiong; Fu, Ying; Wang, Le; Zhou, Xuefeng; Wang, Shanmin; Zhu, Zihao; Chen, Kaiwen; Jiang, Chengyu; Shiroka, Toni; Hillier, Adrian D.; Mei, Jia Wei; Shu, Lei

doi:10.1088/0256-307X/41/9/097502

Microscopic magnetism of nickel-based infinite-layer superconducting parent compounds RNiO₂ (R = La, Nd): a μSR study

Wu Q, Fu Y, Wang L, Zhou X, Wang S, Zhu Z, Chen K, Jiang C, Shiroka T, Hillier AD, Mei JW & Shu L

Citation

Wu, Q., Fu, Y., Wang, L., Zhou, X., Wang, S., Zhu, Z., … Shu, L. (2024). Microscopic magnetism of nickel-based infinite-layer superconducting parent compounds RNiO₂ (R = La, Nd): a μSR study. Chinese Physics Letters, 41(9), 097502 (7 pp.). https://doi.org/10.1088/0256-307X/41/9/097502

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:66296

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.