Coexistence of Quasi-two-dimensional Superconductivity and Tunable Kondo Lattice in a van der Waals Superconductor  

作　　者：Shiwei Shen Tian Qin Jingjing Gao Chenhaoping Wen Jinghui Wang Wei Wang Jun Li Xuan Luo Wenjian Lu Yuping Sun Shichao Yan 沈世伟;秦天;高婧婧;文陈昊平;王靖珲;王维;李军;罗轩;鲁文建;孙玉平;颜世超(School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;Key Laboratory of Materials Physics,Institute of Solid State Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China;High Magnetic Field Laboratory,HFIPS,Chinese Academy of Sciences,Hefei 230031,China;Collaborative Innovation Centre of Advanced Microstructures,Nanjing University,Nanjing 210093,China)

机构地区：[1]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [2]Key Laboratory of Materials Physics,Institute of Solid State Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China [3]University of Science and Technology of China,Hefei 230026,China [4]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China [5]High Magnetic Field Laboratory,HFIPS,Chinese Academy of Sciences,Hefei 230031,China [6]Collaborative Innovation Centre of Advanced Microstructures,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Physics Letters》2022年第7期81-86,共6页中国物理快报（英文版）

基　　金：the financial support from the National Key R&D Program of China(Grant No.2020YFA0309602);the National Natural Science Foundation of China(Grant No.11874042);the support from National Natural Science Foundation of China(Grant No.12004250);the support from the National Natural Science Foundation of China(Grant No.12004251);the National Natural Science Foundation of China(Grant Nos.11674326 and 11774351);the start-up funding from Shanghai Tech University;the Shanghai Sailing Program(Grant No.20YF1430700);the Shanghai Sailing Program(Grant No.21YF1429200);the support from the National Key R&D Program(Grant No.2021YFA1600201);the Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences’Large-Scale Scientific Facility(Grant Nos.U1832141,U1932217 and U2032215)。

摘　　要：Realization of Kondo lattice in superconducting van der Waals materials not only provides a unique opportunity for tuning the Kondo lattice behavior by electrical gating or intercalation,but also is helpful for further understanding the heavy fermion superconductivity.Here we report a low-temperature and vector-magneticfield scanning tunneling microscopy and spectroscopy study on a superconducting compound(4Hb-TaS_(2))with alternate stacking of 1T-TaS_(2)and 1H-TaS_(2)layers.We observe the quasi-two-dimensional superconductivity in the 1H-TaS_(2)layer with anisotropic response to the in-plane and out-of-plane magnetic fields.In the 1T-TaS_(2)layer,we detect the Kondo resonance peak that results from the Kondo screening of the unpaired electrons in the Star-of-David clusters.We also find that the intensity of the Kondo resonance peak is sensitive to its relative position with the Fermi level,and it can be significantly enhanced when it is further shifted towards the Fermi level by evaporating Pb atoms onto the 1T-TaS_(2)surface.Our results not only are important for fully understanding the electronic properties of 4Hb-TaS_(2),but also pave the way for creating tunable Kondo lattice in the superconducting van der Waals materials.

关 键 词：red Coexistence of Quasi-two-dimensional Superconductivity and Tunable Kondo Lattice in a van der Waals Superconductor Lattice 

分 类 号：O469[理学—凝聚态物理]