Journal
SCIENTIFIC REPORTS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep36258
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Funding
- MEXT [22244045, 24654105, 25287075, 26105004, 26105007, 26105010]
- Program for Promoting the Enhancement of Research Universities
- EPSRC [EP/K027255]
- LEMSUPER project (JST-EU Superconductor Project) of the Japan Science and Technology Agency (JST)
- ACT-C project of Japan
- [2015A0124]
- [2015B1007]
- Grants-in-Aid for Scientific Research [26105004, 25287075, 14J00228, 26105010, 26400361, 15KK0167, 26105001, 26105007, 15K17682, 26105013, 15K21719] Funding Source: KAKEN
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From the C 1s and K 2p photoelectron holograms, we directly reconstructed atomic images of the cleaved surface of a bimetal-intercalated graphite superconductor, (Ca, K) C-8, which differed substantially from the expected bulk crystal structure based on x-ray diffraction (XRD) measurements. Graphene atomic images were collected in the in-plane cross sections of the layers 3.3 angstrom and 5.7 angstrom above the photoelectron emitter C atom and the stacking structures were determined as AB-and AA-type, respectively. The intercalant metal atom layer was found between two AA-stacked graphenes. The K atomic image revealing 2 x 2 periodicity, occupying every second centre site of C hexagonal columns, was reconstructed, and the Ca 2p peak intensity in the photoelectron spectra of (Ca, K) C-8 from the cleaved surface was less than a few hundredths of the K 2p peak intensity. These observations indicated that cleavage preferentially occurs at the KC8 layers containing no Ca atoms.
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