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김근수
원자제어 저차원 전자계 연구단
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Interlayer-state-driven superconductivity in CaC6 studied by angle-resolved photoemission spectroscopy

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Title
Interlayer-state-driven superconductivity in CaC6 studied by angle-resolved photoemission spectroscopy
Author(s)
Kyung W.; Kim Y.; Han G.; Leem C.; Kim C.; Koh Y.; Kim B.; Kim Y.; Kim J.S.; Keun Su Kim; Rotenberg E.; Denlinger J.D.; Kim C.
Publication Date
2015-12
Journal
PHYSICAL REVIEW B, v.92, no.22, pp.224516 -
Publisher
AMER PHYSICAL SOC
Abstract
We performed angle-resolved photoemission experiments on CaC6 and measured kz-dependent electronic structures to investigate the interlayer states. The results reveal a spherical interlayer Fermi surface centered at the Γ point. We also find that the graphene-driven band possesses a weak kz dispersion. The overall electronic structure shows a peculiar single-graphene-layer periodicity in the kz 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 Cxy phonon mode as the origin of the superconductivity in CaC6, which strongly suggests interlayer-state-driven superconductivity. © 2015 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/2424
DOI
10.1103/PhysRevB.92.224516
ISSN
1098-0121
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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