发表机构
Institute for Solid State Physics, The University of Tokyo; Department of Materials Science and Engineering, Kyoto University; Institute for Integrated Radiation and Nuclear Science, Kyoto University; Institute of Multidisciplinary Research for Advanced Materials, Tohoku University; Department of Molecular Chemistry and Biochemistry, Doshisha University（东京大学固体物理研究所; 京都大学材料科学与工程系; 京都大学辐射核科学综合研究所; 东北大学先进材料跨学科研究所; 立命馆大学分子化学与生物化学系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过中子衍射实验，发现LuInCo4中巡游Co-3d电子逐渐局域化增强铁磁不稳定性，导致低温变磁转变，为研究电子局域化与巡游铁磁相互作用提供模型体系。
AI 中文摘要
我们通过粉末和单晶中子衍射测量，研究了具有钴烧绿石晶格的巡游电子铁磁体LuInCo4的微观磁态。零场下的粉末中子衍射谱可以用简单的q=0共线铁磁结构很好地描述，有序Co磁矩为0.9μB。单晶中子衍射实验进一步表明，不存在反铁磁有序和长周期螺旋磁调制。此外，在q=0附近观察到弥散磁散射，其强度分布在冷却过程中在倒易空间中逐渐展宽。基于这些观察，我们提出了低温变磁转变的可能微观起源，即由巡游Co-3d电子逐渐局域化增强的铁磁不稳定性。这些结果表明，LuInCo4为研究钴基金属烧绿石化合物中电子局域化与巡游电子铁磁性之间的相互作用提供了一个模型体系。
英文摘要
We investigated the microscopic magnetic state of the itinerant-electron ferromagnet LuInCo4 with a cobalt pyrochlore lattice by means of powder and single-crystal neutron diffraction measurements. The powder neutron diffraction profiles at zero field are well described by a simple q = 0 collinear ferromagnetic structure with an ordered Co moment of 0.9 uB. Single-crystal neutron diffraction experiments further suggest the absence of both antiferromagnetic order and long-period helical magnetic modulation. In addition, diffuse magnetic scattering was observed around q = 0, with its intensity distribution gradually broadened in reciprocal space upon cooling. Based on these observations, we propose a possible microscopic origin of the low-temperature metamagnetic transition in terms of a ferromagnetic instability enhanced by gradual localization of the itinerant Co-3d electrons. These results suggest that LuInCo4 provides a model system for investigating the interplay between electron localization and itinerant-electron ferromagnetism in cobalt-based metallic pyrochlore compounds.
Comments16 pages, 5 figures
