发表机构
The University of Tokyo; Japan Synchrotron Radiation Research Institute (JASRI); Tohoku University; Okayama University; Waseda University; Kagami Memorial Research Institute for Materials Science and Technology, Waseda University; RIKEN Center for Emergent Matter Science (CEMS); Institute for Materials Research (IMR), Tohoku University; International Quantum Materials Center (Q²),Advanced Institute for Materials Research (WPI-AIMR), Tohoku University; Nagoya Industrial Science Research Institute（东京大学; 日本同步辐射研究所; 东北大学; 冈山大学; 早稻田大学; 早稻田大学镜纪念材料科学技术研究所; 理化学研究所新兴物质科学中心; 东北大学材料科学高等研究所; 东北大学先进材料研究国际量子材料中心; 名古屋工业科学研究所以）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过高精度X射线衍射与差分傅里叶合成，直接观测了MnV2O4中不同于既有模型的复杂轨道有序态，解决了长期争议，为阻挫自旋-轨道系统提供了新方法。
AI 中文摘要
具有几何阻挫烧绿石结构的钒尖晶石氧化物中的轨道有序一直是一个争议性课题，原因是理论模型相互竞争且缺乏直接的实验证据。这里，我们将高精度单晶同步辐射X射线衍射与核心差分傅里叶合成相结合，在实空间中可视化轨道有序基态的价电子密度（VED）。通过仔细研究多重散射伪影，我们确定低温结构属于I41/amd空间群。重建的V位点周围的VED揭示了一种轨道有序态，该态不同于先前提出的实轨道和复轨道模型。我们的结果解决了MnV2O4中长期存在的争议，并为识别阻挫自旋-轨道系统中的轨道态建立了一条途径。
英文摘要
Orbital ordering in vanadium spinel oxides with a geometrically frustrated pyrochlore structure has been a subject of controversy, owing to competing theoretical models and the absence of direct experimental evidence. Here we combine high-precision single-crystal synchrotron x-ray diffraction with core differential fourier synthesis to visualize the valence electron density (VED) of the orbital-ordered ground state in real space. By carefully investigating multiple-scattering artifacts, we identify the low-temperature structure as belonging to the I41/amd space group. The reconstructed VED around the V sites reveals an orbital-ordered state distinct from both previously proposed real- and complex-orbital models. Our results resolve the long-standing controversy in MnV2O4 and establish a route to identifying orbital states in frustrated spin-orbital systems.
Comments7 pages, 4 figures, supplementary text with 7 supplementary figures and 7 supplementary tables
