Interlayer-state-driven superconductivity in CaC6 studied by angle-resolved photoemission spectroscopy
SCIE
SCOPUS
- Title
- Interlayer-state-driven superconductivity in CaC6 studied by angle-resolved photoemission spectroscopy
- Authors
- Kyung, W; Kim, Y; Han, G; Leem, C; Kim, C; Koh, Y; Kim, B; Kim, Y; Kim, JS; Kim, KS; Rotenberg, E; Denlinger, JD; Kim, C
- Date Issued
- 2015-12-30
- Publisher
- AMER PHYSICAL SOC
- Abstract
- 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.
- Keywords
- Antenna in packages; Low temperature co fired ceramic(LTCC); LTCC; Polyimide substrate; Tera Hertz; Transition; Transmission characteristics; Waveguide transition
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/35789
- DOI
- 10.1103/PHYSREVB.92.224516
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 92, no. 22, 2015-12-30
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- There are no files associated with this item.
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