Interlayer-state-driven superconductivity in CaC6 studied by angle-resolved photoemission spectroscopy

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We performed angle-resolved photoemission experiments on CaC6 and measured k(z)-dependent electronic structures to investigate the interlayer states. The results reveal a spherical interlayer Fermi surface centered at the Gamma point. We also find that the graphene-driven band possesses a weak k(z) dispersion. The overall electronic structure shows a peculiar single-graphene-layer periodicity in the k(z) direction although the CaC6 unit cell is supposed to contain three graphene layers. This suggests that the c-axis ordering of Ca has little effect on the electronic structure of CaC6. In addition to CaC6, we also studied the a low-temperature superconductor BaC6. For BaC6, the graphene-band Dirac-point energy is smaller than that of CaC6. Based on data from CaC6 and BaC6, we rule out the C-xy phonon mode as the origin of the superconductivity in CaC6, which strongly suggests interlayer-state-driven superconductivity
Publisher
AMER PHYSICAL SOC
Issue Date
2015-12
Language
English
Article Type
Article
Keywords

GRAPHENE SHEETS; C6CA

Citation

PHYSICAL REVIEW B, v.92, no.22

ISSN
2469-9950
DOI
10.1103/PhysRevB.92.224516
URI
http://hdl.handle.net/10203/212593
Appears in Collection
NT-Journal Papers(저널논문)
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