Light-Induced Mott Insulator-to-Metal Phase Transition in Ultrathin Intermediate-Spin Ferromagnetic Perovskite Ruthenates.
Ruxin LiuLiang SiWei NiuXu ZhangZhongqiang ChenChangzheng ZhuWenzhuo ZhuangYongda ChenLiqi ZhouChunchen ZhangPeng WangFengqi SongLin TangYongbing XuZhicheng ZhongRong ZhangXuefeng WangPublished in: Advanced materials (Deerfield Beach, Fla.) (2023)
Light control of emergent quantum phenomena is a widely used external stimulus for quantum materials. Generally, perovskite strontium ruthenate SrRuO 3 has an itinerant ferromagnetism with a low-spin state. However, the phase of intermediate-spin (IS) ferromagnetic metallic state has never been seen. Here, by means of ultraviolet light irradiation, we show the photocarrier doping induced Mott insulator-to-metal phase transition in a few atomic layers of perovskite IS ferromagnetic SrRuO 3- δ . This new metastable IS metallic phase can be reversibly regulated due to the convenient photocharge transfer from SrTiO 3 substrates to SrRuO 3- δ ultrathin films. Our dynamical mean-field theory calculations further verify such photoinduced electronic phase transformation owing to oxygen vacancies and orbital reconstruction. The optical manipulation of charge transfer finesse is an alternative pathway towards discovering novel metastable phases in strongly correlated systems and facilitates the potential light-controlled device applications in optoelectronics and spintronics. This article is protected by copyright. All rights reserved.
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