Formation of Nanofoam carbon and re-emergence of Superconductivity in compressed CaC6

被引：0
作者：
Yan-Ling Li
Wei Luo
Xiao-Jia Chen
Zhi Zeng
Hai-Qing Lin
Rajeev Ahuja
机构：
[1] School of Physics and Electronic Engineering,Department of Physics and Astronomy
[2] Jiangsu Normal University,Department of Materials Science and Engineering
[3] Condensed Matter Theory Group,undefined
[4] Uppsala University,undefined
[5] Key Laboratory of Materials Physics,undefined
[6] Institute of Solid State Physics,undefined
[7] Chinese Academy of Sciences,undefined
[8] Geophysical Laboratory,undefined
[9] Carnegie Institution of Washington,undefined
[10] Center for High pressure Science and Technology Advanced Research,undefined
[11] Beijing Computational Science Research Center,undefined
[12] People's Republic of China,undefined
[13] Applied Material PhysicsPeople's Republic of China,undefined
[14] Royal Institute of Technology (KTH),undefined
[15] ,undefined
来源：
Scientific Reports | / 3卷
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摘要：
Pressure can tune material's electronic properties and control its quantum state, making some systems present disconnected superconducting region as observed in iron chalcogenides and heavy fermion CeCu2Si2. For CaC6 superconductor (Tc of 11.5 K), applying pressure first Tc increases and then suppresses and the superconductivity of this compound is eventually disappeared at about 18 GPa. Here, we report a theoretical finding of the re-emergence of superconductivity in heavily compressed CaC6. The predicted phase III (space group Pmmn) with formation of carbon nanofoam is found to be stable at wide pressure range with a Tc up to 14.7 K at 78 GPa. Diamond-like carbon structure is adhered to the phase IV (Cmcm) for compressed CaC6 after 126 GPa, which has bad metallic behavior, indicating again departure from superconductivity. Re-emerged superconductivity in compressed CaC6 paves a new way to design new-type superconductor by inserting metal into nanoporous host lattice.
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  • [1] Rahnejat KC(2011)Charge density waves in the graphene sheets of the superconductor CaC Nature Commun. 2 558-371
  • [2] Ganin AY(2008)Bulk superconductivity at 38 K in a molecular system Nature Mater. 7 367-1590
  • [3] Takabayashi Y(2009)The Disorder-Free Non-BCS Superconductor Cs Science 323 1585-226
  • [4] Hannay NB(1965)C Phys. Rev. Lett. 14 225-41
  • [5] Emery N(2005) Emerges from an Antiferromagnetic Insulator Parent State Phys. Rev. Lett. 95 087003-067004
  • [6] Weller TE(2005)Superconductivity in Graphitic Compounds Nature Phys. 1 39-244715
  • [7] Ellerby M(2007)Superconductivity of Bulk CaC Phys. Rev. Lett. 98 067002-720
  • [8] Saxena SS(2010)Superconductivity in the intercalated graphite compounds C Phys. Rev. B 82 132502-1632
  • [9] Smith RP(2006)Yb and C Phys. Rev. B 74 214513-867
  • [10] Skipper NT(2006)Ca Phys. Rev. B 74 184519-185
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