Max Planck Institute for Solid State Research

报告摘要:

In this talk, I will present recent our studies on the magnetic ground state and (para)magnon excitations in 4d-electron materials, using Raman scattering and Resonant Inelastic X-ray scattering (RIXS) under uniaxial strain. I will begin with the spin-orbit Mott insulator Ca2RuO4, where we observe a strain-induced magnetic phase transition and magnon anomalies [1]. These results reveal the high sensitivity of spin–orbit entangled states to external strain and establish Ca2RuO4 as a model system for strain-tunable magnetism, with promising implications for THz magnonic applications. I will then show our recent RIXS results on metallic Sr2RuO4, in which uniaxial strain leads to a significant softening of paramagnons [1-2]. This dramatic response suggests a possible connection to unconventional superconductivity. In addition, I will present the observation of spin-orbit multiplets in the metallic Sr2RuO4 [3] and discuss potential strain-induced effects in this material.

References:

[1] L. Wang et al., unpublished.

[2] H. Suzuki* and L. Wang* et al., Nat. Commun. 14, 7042 (2023)

[3] L. Wang et al., PRL 132, 116502 (2024).

报告人简介:

王立晨，博士毕业于北京大学，随后在德国马克斯普朗克固体研究所（斯图加特）进行博士后研究，期间作为洪堡学者获得资助。主要聚焦于强关联电子材料的光谱学研究，并通过施加单轴压力实现对材料量子态的调控和探索。目前以（共同）第一作者/通讯作者身份在 Nat. Phys., Nat. Commun., Phys. Rev. Lett. 等期刊发表多篇论文。

报告地点：中关村M楼236、怀柔X1楼206(视频会议）

邀请人：李源   研究员

联系人：傅琦 （82649469）