发表机构
Indian Institute of Science Education and Research Kolkata; National Centre for High-Pressure Studies, Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata; Iowa State University; IMPMC, Sorbonne Université, CNRS, MNHN（印度科学教育研究所加尔各答分校; 印度科学教育研究所加尔各答分校物理科学学院高压研究中心; 爱荷华州立大学; 索邦大学、法国国家科学研究中心、法国国家自然历史博物馆巴黎矿物起源与演化实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过高压XRD、拉曼光谱和低温磁化测量，发现Eu掺杂LaCrO$_3$在10.6 GPa发生正交到菱方相变，并预测压力诱导磁基态转变为反铁磁有序。
AI 中文摘要
在本研究中，我们对5% Eu掺杂的LaCrO$_3$（ELCO）进行了详细的高压研究，使用同步辐射X射线衍射（XRD）、显微拉曼光谱和低温磁化测量，以关联压力下的结构和磁性性质。高压XRD揭示了在约10.6 GPa处发生从正交晶系到菱方晶系的结构相变。高压拉曼数据证实了这一结果，并表明与低频软模相关的晶格不稳定性在驱动这一相变中起着关键作用。此外，在约4.5 GPa处观察到多个拉曼模式的拉曼位移和积分强度的显著异常。通过将低温磁化测量与XRD和拉曼数据中观察到的异常相结合，并与LaCrO$_3$（LCO）中的类似结果进行比较，预测了压力诱导的磁基态向反铁磁有序的转变。
英文摘要
In this study, we have carried out a detailed high pressure investigation on 5$\%$ Eu doped LaCrO$_3$ (ELCO) using synchrotron X-ray diffraction (XRD), micro Raman spectroscopy, and low-temperature magnetization measurements to correlate the structural and magnetic properties under pressure. The high pressure XRD reveals the orthorhombic to rhombohedral structural phase transition around 10.6 GPa. The high pressure Raman data corroborate this result and indicate that the lattice instabilities associated with the low-frequency soft modes play a crucial role in driving this transition. In addition, a pronounced anomaly in the Raman shift and integrated intensity of several Raman modes is observed around 4.5 GPa. By combining the low-temperature magnetization measurements with the anomalies observed in the XRD and Raman data and by comparing with the similar results in LaCrO$_3$ (LCO), a pressure-induced change in the magnetic ground state to antiferromagnetic ordering is predicted.
