首页|Strong-coupling superconductivity with Tc above 70 K in Be-decorated monolayer T-graphene

Strong-coupling superconductivity with Tc above 70 K in Be-decorated monolayer T-graphene

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Using first-principles calculations,we predict a new type of two-dimensional(2D)beryllium(Be)-decorated T-graphene named BeC2,where Be atoms are inserted into C-C bonds linking the carbon tetrarings of T-graphene.The band structure shows that BeC2 is metallic,thus,the possible phonon-mediated superconductivity is explored based on the Eliashberg equation.The calcu-lated electron-phonon coupling(EPC)constant λ is up to 4.07,and the corresponding superconducting critical temperature(Tc)is 72.1 K,approaching the liquid nitrogen temperature.The reason for the high Tc is the strong EPC.And it is proved to be an anisotropic single-gap superconductor by analyzing the superconducting gap △k of BeC2.The electronic susceptibility calcula-tion shows strong nesting effect in BeC2.Since rare 2D superconductors show such a strong EPC constant λ which originates from the coupling between electrons in C-pz orbital and in-plane vibrations of Be and C atoms,the predicted BeC2 provides a new platform for investigating strong EPC 2D superconductor.

two-dimensional carbon-based superconductorelectron-phonon couplingstrong couplinghigh superconducting critical temperature

Liu Yang、Peng-Fei Liu、Hao-Dong Liu、Ya-Ping Li、Na Jiao、Hong-Yan Lu、Bao-Tian Wang、Ping Zhang

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School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,China

Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

Spallation Neutron Source Science Center,Dongguan 523803,China

Institute of Applied Physics and Computational Mathematics,Beijing 100088,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaMajor Basic Program of Natural Science Foundation of Shandong ProvinceProject of Introduction and Cultivation for Young Innovative Talents in Colleges and Universities of Shandong Province

12074213115741081207438112104458ZR2021ZD01

2024

10.1007/s11433-023-2208-9

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(1)
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