High Pressure and Superconductivity: Intercalated Graphite Cac6 as a Model System

Gauzzi, A.; Bendiab, Nedjma; d’Astuto, Matteo; Canny, B.; Calandra, Matteo; Mauri, Francesco; Loupias, G.; Takashima, S.; Takagi, H.; Takeshita, Nao; Terakura, C.; Eméry, N.; Hérold, Claire; Lagrange, P.; Hanfland, Michael; Mézouar, M.

doi:10.1007/978-90-481-9258-8_33

Cited by 2 publications

(2 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…And C 6 Ca exhibits 𝑇 c = 15.1 K at high pressure of 7.5 GPa. [34] In addition to the bulk GICs, superconductivity in doped graphene with lithium, [35] potassium [36] and Calcium, [37] etc. has been studied theoretically and experimentally.…”

mentioning

confidence: 99%

Superconducting Single-Layer T-Graphene and Novel Synthesis Routes*

Gu¹,

Xing²,

Sun³

2019

Chinese Phys. Lett.

View full text Add to dashboard Cite

Single-layer superconductors are ideal materials for fabricating superconducting nano devices. However, up to date, very few single-layer elemental superconductors have been predicted and especially no one has been successfully synthesized yet. Here, using crystal structure search techniques and ab initio calculations, we predict that a single-layer planar carbon sheet with 4-and 8-membered rings called T -graphene is a new intrinsic elemental superconductor with superconducting critical temperature (Tc) up to around 20.8 K. More importantly, we propose a synthesis route to obtain such a single-layer T -graphene, that is, a T -graphene potassium intercalation compound (C4K with P 4/mmm symmetry) is firstly synthesized at high pressure (> 11.5 GPa) and then quenched to ambient condition; and finally, the single-layer T -graphene can be either exfoliated using the electrochemical method from the bulk C4K, or peeled off from bulk T -graphite C4, where C4 can be obtained from C4K by evaporating the K atoms. Interestingly, we find that the calculated Tc of C4K is about 30.4 K at 0 GPa, which sets a new record for layered carbon-based superconductors. The present findings add a new class of carbon-based superconductors. In particular, once the single-layer T -graphene is synthesized, it can pave the way for fabricating superconducting devices together with other 2D materials using the layer-by-layer growth techniques. arXiv:1908.01302v1 [cond-mat.mtrl-sci]

show abstract