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Direct Observation of Superconductivity in Calcium-Intercalated Bilayer Graphene by in situ Electrical Transport Measurements

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arxiv 1508.07079 v1 pith:N6XJGURM submitted 2015-08-28 cond-mat.supr-con

S. Ichinokura , K. Sugawara , A. Takayama , T. Takahashi , S. Hasegawa This is my paper · ORCID
classification cond-mat.supr-con
keywords superconductivitybilayergrapheneelectricalmeasurementssitutransportabsence
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abstract

We report the superconductivity in Ca-intercalated bilayer graphene C$_6$CaC$_6$, the thinnest limit of Ca graphite intercalation compound. We performed \textit{in situ} electrical transport measurements on pristine bilayer graphene, C$_6$LiC$_6$ and C$_6$CaC$_6$ fabricated on SiC substrate under zero and non-zero magnetic field. While both bilayer graphene and C$_6$LiC$_6$ show non-superconducting behavior, C$_6$CaC$_6$ exhibits the superconductivity with transition temperature ($T_{{\rm c}}$) of 4.0 K. The observed $T_{{\rm c}}$ in C$_6$CaC$_6$ and the absence of superconductivity in C$_6$LiC$_6$ show a good agreement with the theoretical prediction, suggesting the importance of a free-electron-like metallic band at the Fermi level to drive the superconductivity.

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  1. Understanding the origin of superconducting dome in electron-doped MoS$_2$ monolayer

    cond-mat.supr-con 2024-12 conditional novelty 6.0 of 10

    The superconducting dome in electron-doped MoS2 is recreated from first principles and traced to the 1x1 H to 2x2 charge-density-wave transition and later structural phases.

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