Strong Coupling Superconductivity in Ca-Intercalated Bilayer Graphene on SiC
Strong Coupling Superconductivity in Ca-Intercalated Bilayer Graphene on SiC
复制标题
SiC 上钙插层双层石墨烯的强耦合超导性
DOI：
10.1021/acs.nanolett.2c02804
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发表时间：
2022
期刊：
影响因子：
10.8
通讯作者：
Jin-Feng Jia
中科院分区：
文献类型：
--
作者：
Xutao Wang;Ningning Liu;Yanfu Wu;Yueqiao Qu;Wenxuan Zhang;Jinyue Wang;D;an Guan;Shiyong Wang;Hao Zheng;Yaoyi Li;Canhua Liu;Jin-Feng Jia
The metal-intercalated bilayer graphene has a flat band with a high density of states near the Fermi energy and thus is anticipated to exhibit an enhanced strong correlation effect and associated fascinating phenomena, including superconductivity. By using a self-developed multifunctional scanning tunneling microscope, we succeeded in observing the superconducting energy gap and diamagnetic response of a Ca-intercalated bilayer graphene below a critical temperature of 8.83 K. The revealed high value of gap ratio, 2Δ/kBTc≈ 5.0, indicates a strong coupling superconductivity, while the variation of penetration depth with temperature and magnetic field indicates an isotropics-wave superconductor. These results provide crucial experimental clues for understanding the origin and mechanism of superconductivity in carrier-doped graphene.
