发表机构
Synchrotron SOLEIL; Université Paris-Saclay; CNRS, Laboratoire de Physique des Solides, UMR-8502; Institut universitaire de France (IUF); University of Zagreb; Institute of Low Temperature and Structure Research, Polish Academy of Sciences; Sorbonne Université（SOLEIL同步辐射中心; 巴黎萨克雷大学; 法国国家科学研究中心固体物理实验室; 法兰西学院; 萨格勒布大学; 波兰科学院低温与结构研究所; 索邦大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过多种实验与计算手段，发现EuIrGe3在压力下经历电子价态变化和结构相变，其反铁磁序保持稳健，且压力响应与同类化合物不同，凸显过渡金属d电子的关键作用。
AI 中文摘要
我们利用X射线吸收光谱、同步辐射X射线衍射并结合密度泛函理论计算以及电阻率测量，研究了非中心对称BaNiSn3型反铁磁体EuIrGe3在压力诱导下的电子与晶体结构演化。Eu L3边光谱显示，在压缩过程中平均Eu价态持续增加，同时伴随着Ge和Ir电子态的修饰。高压X射线衍射显示四方（I4mm）相中存在各向异性的晶格压缩，并提供了在38 GPa以上发生结构相变的证据。实验确定的晶格和状态方程参数与DFT计算结果吻合良好。电阻率测量显示，在18 GPa以下反铁磁有序温度单调增加，表明尽管非磁性Eu3+构型对中间价态的贡献不断增加，反铁磁基态仍然保持稳健。这些结果表明，EuIrGe3表现出与EuCoGe3和EuRhGe3不同的压力响应，突显了过渡金属d电子态在EuTGe3家族压力诱导电子与结构演化中的重要作用。
英文摘要
We investigated the pressure-induced evolution of the electronic and crystal structure of the noncentrosymmetric BaNiSn3-type antiferromagnet EuIrGe3 using x-ray absorption spectroscopy, synchrotron x-ray diffraction complemented by density functional theory calculations, and electrical resistivity measurements. The Eu L3-edge spectra reveal a continuous increase in the mean Eu valence under compression, accompanied by modifications of the Ge and Ir electronic states. High- pressure x-ray diffraction shows anisotropic lattice compression in the tetragonal (I4mm) phase and provides evidence for a structural phase transition above 38 GPa. The experimentally deter- mined lattice and equation-of-state parameters are in good agreement with the DFT calculations. Electrical resistivity measurements reveal a monotonic increase in the antiferromagnetic ordering temperatures up to 18 GPa, indicating that the antiferromagnetic ground state remains robust despite the increasing contribution of the nonmagnetic Eu3+ configuration to the intermediate va- lence state. These results demonstrate that EuIrGe3 exhibits a pressure response distinct from EuCoGe3 and EuRhGe3, highlighting the important role of the transition metal d-electron states in the pressure-induced electronic and structural evolution of the EuT Ge3 family
Comments7 Figures, 10 Pages
