Strong Coupling Superconductivity in Ca-Intercalated Bilayer Graphene on SiC.
basic_science · Level V
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- Record sourced from PubMed, PMID 36066512.
- Also identified by DOI 10.1021/acs.nanolett.2c02804.
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Abstract
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/<i>k</i><sub>B</sub><i>T</i><sub>c</sub> ≈ 5.0, indicates a strong coupling superconductivity, while the variation of penetration depth with temperature and magnetic field indicates an isotropic <i>s</i>-wave superconductor. These results provide crucial experimental clues for understanding the origin and mechanism of superconductivity in carrier-doped graphene.