Influence of lithium doping on the thermodynamic properties of graphene based superconductors

The superconducting phase in graphene can be induced by doping its surface with lithium atoms. In this paper, it is shown that the critical temperature (TC) for the LiC6 and Li2C6 compounds changes from 8.55 K to 21.83 K. The other thermodynamic parameters-the order parameter (Δ), the specific heat...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-06, Vol.26 (25), p.255701-255701
Main Authors: Szczȩ niak, D, Durajski, A P, Szczȩ niak, R
Format: Article
Language:English
Subjects:
Condensed matter
Doping
Graphene
Lithium
Order parameters
Superconductivity
Texts
thermodynamic properties
Thermodynamics
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Summary:The superconducting phase in graphene can be induced by doping its surface with lithium atoms. In this paper, it is shown that the critical temperature (TC) for the LiC6 and Li2C6 compounds changes from 8.55 K to 21.83 K. The other thermodynamic parameters-the order parameter (Δ), the specific heat for the superconducting (CS) and the normal (CN) state and the thermodynamic critical field (HC)-differ from the predictions of the Bardeen-Cooper-Schrieffer theory. In particular, the ratio RΔ ≡ 2Δ(0)/kBTC is equal to and . Additionally, the quantities RC ≡ ΔC(TC)/CN(TC) and take the values , and , . Finally, it is shown that the electron effective mass at TC is high and equals: and .
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/26/25/255701