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Superconductivity in Ca-intercalated bilayer graphene

机译:Ca插层双层石墨烯的超导电性

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摘要

Recent observation of proximity effect \cite{Morpurgo:2007} has ignitedinterest in superconductivity in graphene and its derivatives. We considerCa-intercalated graphene bilayer and argue that it is a superconductor, andlikely with a sizeable $T_{c}$. We find substantial and suggestive similaritiesbetween Ca-intercalated bilayer (C$_{6}$CaC$_{6}$), and CaC$_{6} $, anestablished superconductor with $T_{c}$ = 11.5 K. In particular, the nearlyfree electron band, proven to be instrumental for superconductivity inintercalated graphites, does cross the chemical potential in (C$_{6}$CaC$%_{6}$), despite the twice smaller doping level, satisfying the so-called\textquotedblleft Cambridge criterion\textquotedblright . Calculated propertiesof zone-center phonons are very similar to those of CaC$%_{6}.$ This suggeststhat the critical temperature would probably be on the same scale as inCaC$_{6}$.
机译:对邻近效应的最新观察\ cite {Morpurgo:2007}引起了人们对石墨烯及其衍生物超导性的兴趣。我们考虑了嵌入Ca的石墨烯双层,并认为它是超导体,并且可能具有相当大的$ T_ {c} $。我们发现,Ca嵌入双层(C $ _ {6} $ CaC $ _ {6} $)与CaC $ _ {6} $(已建立的具有$ T_ {c} $ = 11.5 K的超导体)之间存在实质性和暗示性的相似性。特别地,尽管掺杂水平小了两倍,但近乎自由的电子带(已证明对嵌入石墨的超导性有帮助)确实跨越了(C $ _ {6} $ CaC $%_ {6} $)中的化学势。称为\ textquotedblright剑桥标准\ textquotedblright。区域中心声子的计算特性与CaC $%_ {6}。$非常相似。这表明临界温度可能与CaC $ _ {6} $中的比例相同。

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