发表机构
Michigan State University; Gdansk University of Technology; University of California, San Diego（密歇根州立大学; 格但斯克理工大学; 加州大学圣迭戈分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究报道了铀基化合物 UIr$_4$Al$_{15}$ 在室温附近表现出巨大磁弹性耦合，通过 X 射线衍射和磁化率测量揭示了结构畸变与磁排列的强关联，为磁响应量子材料提供了新平台。
AI 中文摘要
电子与结构自由度之间的相互作用是量子材料中许多涌现现象的基础，然而金属体系中的磁弹性耦合通常较弱，且局限于低温或微观尺度。在此，我们报道了铀基金属间化合物 UIr$_4$Al$_{15}$ 在略高于室温的温度下表现出巨大的磁弹性耦合。通过变温单晶 X 射线衍射结合各向异性磁化率测量，我们直接解析了与磁排列耦合的微妙但可复现的结构畸变。尽管没有晶体学对称性破缺，但在磁转变区域附近，晶格参数和特定化学键长出现了显著异常，揭示了晶体结构对磁取向的非同寻常的敏感性。这种耦合使得我们能够直接探测原子间距和局域化学键如何调控块体金属间材料中的电子和磁态。我们的结果确立了 UIr$_4$Al$_{15}$ 作为一个稀有平台，在该平台中，磁性晶格畸变在室温附近强烈交织，为磁响应量子材料和功能性磁传感应用开辟了新机遇。
英文摘要
The interplay between electronic and structural degrees of freedom underpins many emergent phenomena in quantum materials, yet magnetoelastic coupling in metallic systems is typically weak and confined to low temperatures or microscopic length scales. Here, we report giant magnetoelastic coupling slightly above room temperature in the uranium-based intermetallic compound UIr$_4$Al$_{15}$. Using temperature-dependent single-crystal X-ray diffraction together with anisotropic magnetic susceptibility measurements, we directly resolve subtle but reproducible structural distortions coupled to magnetic alignment. Despite the absence of crystallographic symmetry breaking, pronounced anomalies emerge in lattice parameters and selected chemical bond distances near the magnetic transition region, revealing an unusual sensitivity of the crystal structure to magnetic orientation. The coupling enables direct probing of how atomic distances and local chemical bonding govern the electronic and magnetic states in a bulk intermetallic material. Our results establish UIr$_4$Al$_{15}$ as a rare platform in which magnetism and lattice distortions are strongly intertwined near room temperature, opening new opportunities for magnetically responsive quantum materials and functional magnetic sensing applications.
Comments20 Pages, 5+3 figures
