Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface

Fumihiko Matsui, Ritsuko Eguchi, Saki Nishiyama, Masanari Izumi, Eri Uesugi, Hidenori Goto, Tomohiro Matsushita, Kenji Sugita, Hiroshi Daimon, Yuji Hamamoto, Ikutaro Hamada, Yoshitada Morikawa, Yoshihiro Kubozono

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Article number36258
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - Nov 4 2016

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bimetals
photoelectrons
graphite
atoms
periodic variations
cleavage
graphene
emitters
x ray diffraction
crystal structure
cross sections
metals

ASJC Scopus subject areas

  • General

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Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface. / Matsui, Fumihiko; Eguchi, Ritsuko; Nishiyama, Saki; Izumi, Masanari; Uesugi, Eri; Goto, Hidenori; Matsushita, Tomohiro; Sugita, Kenji; Daimon, Hiroshi; Hamamoto, Yuji; Hamada, Ikutaro; Morikawa, Yoshitada; Kubozono, Yoshihiro.

In: Scientific Reports, Vol. 6, 36258, 04.11.2016.

Research output: Contribution to journalArticle

Matsui, F, Eguchi, R, Nishiyama, S, Izumi, M, Uesugi, E, Goto, H, Matsushita, T, Sugita, K, Daimon, H, Hamamoto, Y, Hamada, I, Morikawa, Y & Kubozono, Y 2016, 'Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface', Scientific Reports, vol. 6, 36258. https://doi.org/10.1038/srep36258
Matsui, Fumihiko ; Eguchi, Ritsuko ; Nishiyama, Saki ; Izumi, Masanari ; Uesugi, Eri ; Goto, Hidenori ; Matsushita, Tomohiro ; Sugita, Kenji ; Daimon, Hiroshi ; Hamamoto, Yuji ; Hamada, Ikutaro ; Morikawa, Yoshitada ; Kubozono, Yoshihiro. / Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface. In: Scientific Reports. 2016 ; Vol. 6.
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AU - Kubozono, Yoshihiro

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