Chin. Phys. Lett.  2019, Vol. 36 Issue (9): 097401    DOI: 10.1088/0256-307X/36/9/097401
Superconducting Single-Layer T-Graphene and Novel Synthesis Routes
Qinyan Gu, Dingyu Xing, Jian Sun**
National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093
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Qinyan Gu, Dingyu Xing, Jian Sun 2019 Chin. Phys. Lett. 36 097401
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Abstract 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 ($T_{\rm c}$) 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 (C$_4$K with $P4/mmm$ symmetry) is firstly synthesized at high pressure ($>$11.5 GPa) and then quenched to ambient condition; and finally, the single-layer T-graphene can be either exfoliated using the electrochemical method from the bulk C$_4$K, or peeled off from bulk T-graphite C$_4$, where C$_4$ can be obtained from C$_4$K by evaporating the K atoms. Interestingly, we find that the calculated $T_{\rm c}$ of C$_4$K 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.
Received: 31 July 2019      Published: 03 August 2019
PACS:  74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition)  
  74.62.Fj (Effects of pressure)  
  74.70.Wz (Carbon-based superconductors)  
Fund: Supported by the National Key Research and Development Program of China under Grant No 2016YFA0300404, the National Basic Research Program of China under Grant No 2015CB921202, the National Nature Science Foundation of China under Grant Nos 11574133 and 11834006, the Nature Science Foundation of Jiangsu Province under Grant No BK20150012, the Fundamental Research Funds for the Central Universities, the Science Challenge Project (No TZ2016001).
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Qinyan Gu
Dingyu Xing
Jian Sun
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