Re-emergence of superconductivity via pressure-induced Lifshitz transition in preserved 6R-TaS_(2) crystal structure  

作　　者：Xindeng Lv Hao Song Kun Chen Sirui Liu Yanping Huang Yuqiang Fang Zexiang Shen Tian Cui 

机构地区：[1]Institute of High Pressure Physics,School of Physical Science and Technology,Ningbo University,Ningbo,315211,China [2]State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,200050,China [3]Division of Physics and Applied Physics,School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore,637371,Singapore [4]State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun,130012,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第12期157-165,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFA1405500);National Natural Science Foundation of China(Grant Nos.52072188,and12304072);Program for Science and Technology Innovation Team in Zhejiang(Grant No.2021R01004);Natural Science Foundation of Ningbo(Grant No.2021J121);supported by the User Experiment Assist System of the Shanghai Synchrotron Radiation Facility(SSRF)。

摘　　要：Investigating the implications of interlayer coupling on superconductivity is vital for comprehending the intrinsic mechanisms of two-dimensional materials.Van der Waals heterojunctions have attracted extensive research owing to their exotic interlayer coupling.In this study,we investigated the natural heterostructure superconductor featuring 6R-TaS_(2) via measurements of electrical resistance,the Hall effect,and in-situ synchrotron X-ray diffraction(XRD)under various pressures.The study findings show that the superconducting transition temperature(T_(c))of 6R-TaS_(2) in the range of 0-32.5 GPa exhibits an unusual double-dome behavior as a function of pressure,with the first and second domes in the pressure range of 0-5.3 and 6.8-32.5 GPa,respectively.At 56.6GPa,a new superconducting phase with a T_(c) of 2 K was observed.The XRD results show that the singular evolution of the T_(c) is independent of the structural phase transition.Combining the XRD results,first-principles calculations,and Hall effect measurements,we found that different interlayer coupling effects resulted in double dome superconductivity and the re-emergence of superconducting.Our findings shed light on the pivotal role of interlayer coupling in driving the anomalous alterations in superconducting properties triggered by charge transfer and Fermi surface reconstruction and provide an alternative route for comprehending the mechanisms of superconductivity in transition metal dichalcogenides(TMDs).

关 键 词：high-pressure Lifshitz transition re-emergence superconducting interlayer coupling heterostructures 

分 类 号：O469[理学—凝聚态物理]