Pressure-Induced Intermetallic Charge Transfer and Semiconductor- Metal Transition in Two-Dimensional AgRuO_(3)  

作　　者：Chuanhui Zhu Jinjin Yang Pengfei Shan Mei-Huan Zhao Shuang Zhao Cuiying Pei Bowen Zhang Zheng Deng Mark Croft Yanpeng Qi Lihong Yang Yonggang Wang Xiaojun Kuang Long Jiang Dao-Xin Yao Jin-Guang Cheng Man-Rong Li 

机构地区：[1]Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education,School of Chemistry,Sun Yat-sen University,Guangzhou 510275 [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190 [3]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210 [4]College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004 [5]Department of Physics and Astronomy,Rutgers,The State University of New Jersey,Piscataway,NJ 08854 [6]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210 [7]Shanghai Key Laboratory of High-Resolution Electron Microscopy,ShanghaiTech University,Shanghai 201210 [8]Center for High Pressure Science and Technology Advanced Research(HPSTAR),Beijing 100094 [9]Guangdong Key Laboratory of Magnetoelectric Physics and Devices,School of Physics,Sun Yat-sen University,Guangzhou 510275

出　　处：《CCS Chemistry》2023年第4期934-946,共13页中国化学会会刊（英文）

基　　金：supported by the National Science Foundation of China(grant nos.NSFC-22090041,21875287,U1932217,11974246,12004252,12025408,11921004,11974432,and 92165204);the Program for Guangdong Introducing Innovative and Entrepreneurial Teams(grant no.2017ZT07C069);NKRDPC-2017YFA0206203,NKRDPC-2018YFA0306001.

摘　　要：The intricate correlation between charge degrees of freedom and physical properties is a fascinating area of research in solid state chemistry and condensed matter physics.Herein,we report on the pressureinduced successive charge transfer and accompanied resistive evolution in honeycomb layered ruthenate AgRuO_(3).Structural revisiting and spectroscopic analyses affirm the ilmenite type R-3 structure with mixed valence cations as Ag^(+1/+2)Ru^(+4/+5)O_(3) at ambient pressure.In-situ pressure-and temperature-dependent resistance variation reveals a successive insulatormetal-insulator transition upon pressing,accompanied by unprecedented charge transfer between Ag and Ru under applied pressure,and a further structural phase transition in the insulator region at higher pressure.These phenomena are also corroborated by in-situ pressure-dependent Raman spectra,synchrotron X-ray diffraction,bond valence sums,and electronic structure calculations,emphasizing the dominated rare Ag2+,and near zero thermal expansion in the ab-plane in the metallic zone mostly due to the Jahn-Teller effect of d9-Ag2+.The multiple electronic instabilities in AgRuO_(3) may offer new possibilities toward novel and unconventionally physical and chemical behaviors in strongly correlated honeycomb lattices.

关 键 词：intermetallic charge transfer semiconductor-metal transition honeycomb layered ruthenates high pressure 

分 类 号：TG14[一般工业技术—材料科学与工程]