摘要
Being parent materials of two-dimensional (2D) crystals, van der Waals layered materials have received revived interest. In most 2D materials, the interaction between electrons is negligible. Introducing the interaction can give rise to a variety of exotic properties. Here, via intercalating a van der Waals layered compound VS2, we find evidence for electron correlation by extensive magnetic, thermal, electrical, and thermoelectric characterizations. The low temperature Sommerfeld coefficient is 64 mJ·K-2·mol-1 and the Kadowaki-Woods ratio rKW^0.20a0. Both supports an enhancement of the electron correlation. The temperature dependences of the resistivity and thermopower indicate an important role played by the Kondo effect. The Kondo temperature TK is estimated to be around 8 K. Our results suggest intercalation as a potential means to engineer the electron correlation in van der Waals materials, as well as 2D materials.
作者
牛晶晶
章文杰
李治林
杨嗣贤
闫大禹
陈树林
张哲朋
张艳锋
任新国
高鹏
石友国
俞大鹏
吴孝松
Jingjing Niu;Wenjie Zhang;Zhilin Li;Sixian Yang;Dayu Yan;Shulin Chen;Zhepeng Zhang;Yanfeng Zhang;Xinguo Ren;Peng Gao;Youguo Shi;Dapeng Yu;Xiaosong Wu(State Key Laboratory for Artificial Microstructure and Mesoscopic Physics,Beijing Key Laboratory of Quantum Devices,Peking University,Beijing 100871,China;Collaborative Innovation Center of Quantum Matter,Beijing 100871,China;CAS Key Laboratory of Quantum Information,Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100190,China;Electron Microscopy Laboratory,School of Physics,Peking University,Beijing 100871,China;Center for Nanochemistry,Beijing National Laboratory for Molecular Sciences,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China;International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China;Department of Physics,Southern University of Science and Technology of China,Shenzhen 518055,China)
基金
Project supported by the National Key Basic Research Program of China(Grant Nos.2013CBA01603,2016YFA0300600,and 2016YFA0300903)
the National Natural Science Foundation of China(Grant Nos.11574005,11774009,11222436,and 11574283)
the National Postdoctoral Program for Innovative Talents of China(Grant No.BX201700012)funded by China Postdoctoral Science Foundation.
