无限层镍酸盐中局域磁矩的掺杂依赖关系
Doping dependence of local moments in infinite layer nickelates
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中文总结 AI 辅助
本研究通过μSR技术研究不同掺杂的(La,Sr)NiO₂的磁行为，发现局域磁矩自旋冻结温度与掺杂无关，空穴掺杂会微弱 destabilize 玻璃态，表明磁性与超导基本退耦合，可用多轨道框架描述二者间接作用。
中文摘要 AI 辅助
与超导铜酸盐的母体化合物不同，无限层镍酸盐因不存在长程反铁磁有序而备受关注。相反，镍酸盐在未掺杂和最佳掺杂区间均表现出短程玻璃态行为的证据，表明局域电子磁矩的存在与超导电性无关。然而，其系统性的掺杂依赖磁行为尚未完全阐明，对该行为的表征或可揭示局域磁矩与超导穹顶之间的关系。本研究中，我们对涵盖未掺杂母体化合物、穿过超导穹顶直至过掺杂正常态（Sr取代量0% ≤ x ≤ 25%）的(La,Sr)NiO₂掺杂系列开展μ子自旋旋转（μSR）测试，以探究其磁基态以及随温度变化的静态和动态行为。研究发现，无论掺杂水平如何，局域磁矩都会在几十开尔文量级的温度下发生自旋冻结，进入玻璃态。我们还观察到，随着空穴掺杂量增加，玻璃态会出现微弱的失稳。这些结果表明，磁性和超导电性在很大程度上是退耦合的现象，二者的间接相互作用可在多轨道框架下进行描述。
英文摘要
The infinite layer nickelates are notable for their lack of long-range antiferromagnetic ordering, in contrast to the parent compounds of the superconducting cuprates. Instead, the nickelates show evidence of short-range glassy behavior in both the undoped and optimally-doped regimes, implying that local electronic moments exist independent of superconductivity. However, the systematic doping-dependent magnetic behavior is not yet fully resolved, and characterizing it could uncover the relationship between local moments and the superconducting dome. In this work, we use muon spin rotation ($μ$SR) on a (La,Sr)NiO$_2$ doping series from the undoped parent compound, through the superconducting dome, to the over-doped normal state (Sr substitution 0% $\leq$ x $\leq$ 25%) to probe the magnetic ground state and the temperature-dependent static and dynamic behavior. We find that local moments experience spin freezing into a glassy state at temperatures on the order of a few tens of kelvin regardless of the doping level. We also observe a subtle destabilization of the glassy state with increased hole doping. These observations suggest that magnetism and superconductivity are largely decoupled phenomena with indirect interactions described in a multi-orbital framework.
发表机构
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory（斯坦福材料与能源科学研究所，SLAC国家加速器实验室）
- Stanford University（斯坦福大学）
- PSI Center for Neutron and Muon Sciences（瑞士保罗谢勒研究所中子与μ子科学中心）
- Northwestern University（西北大学）
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS UMR 8502（巴黎萨克雷大学固体物理实验室，CNRS UMR 8502）
- Department of Applied Physics, Stanford University（斯坦福大学应用物理系）
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