151. Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface
- Author
-
60324977, Matsui, Fumihiko, Eguchi, Ritsuko, Nishiyama, Saki, Izumi, Masanari, Uesugi, Eri, Goto, Hidenori, 10373523, Matsushita, Tomohiro, Sugita, Kenji, 20126121, Daimon, Hiroshi, Hamamoto, Yuji, Hamada, Ikutaro, Morikawa, Yoshitada, Kubozono, Yoshihiro, 60324977, Matsui, Fumihiko, Eguchi, Ritsuko, Nishiyama, Saki, Izumi, Masanari, Uesugi, Eri, Goto, Hidenori, 10373523, Matsushita, Tomohiro, Sugita, Kenji, 20126121, Daimon, Hiroshi, Hamamoto, Yuji, Hamada, Ikutaro, Morikawa, Yoshitada, and Kubozono, Yoshihiro
- Abstract
application/pdf, 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)C8, 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 Å and 5.7 Å 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 × 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)C8 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.
- Published
- 2016