TY - JOUR
T1 - Structure of superconducting Ca-intercalated bilayer Graphene/SiC studied using total-reflection high-energy positron diffraction
AU - Endo, Y.
AU - Fukaya, Y.
AU - Mochizuki, I.
AU - Takayama, A.
AU - Hyodo, T.
AU - Hasegawa, S.
N1 - Funding Information:
We thank T. Iimori (Institute for Solid State Physics, The University of Tokyo) and M. Imamura (Synchrotron Light Application Center, Saga University) for their useful discussion and assistance in experiments to determine the number of graphene layers by ARPES study. This study was performed under the PF Proposal No. 2017G519 at Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Japan. This work was supported by JSPS KAKENHI Grant Numbers 19H04398 and 19J12818 and by the TIA collaborative research program “Kakehashi” Numbers TK16-42 and TK17-048.
Funding Information:
We thank T. Iimori (Institute for Solid State Physics, The University of Tokyo) and M. Imamura (Synchrotron Light Application Center, Saga University) for their useful discussion and assistance in experiments to determine the number of graphene layers by ARPES study. This study was performed under the PF Proposal No. 2017G519 at Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Japan . This work was supported by JSPS KAKENHI Grant Numbers 19H04398 and 19J12818 and by the TIA collaborative research program "Kakehashi" Numbers TK16-42 and TK17-048 .
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/2
Y1 - 2020/2
N2 - We have investigated the atomic structure of superconducting Ca-intercalated bilayer graphene on a SiC(0001) substrate using total-reflection high-energy positron diffraction. By comparing the experimental rocking-curves with ones calculated for various structural models using a full-dynamical theory, we have found that Ca atoms are intercalated in the graphene-buffer interlayer, rather than between the two graphene layers. From transport measurements, the superconducting transition was observed to be at Tc onset = 4 K for this structure. This study is the first to clearly identify the relation between the atomic arrangement and superconductivity in Ca-intercalated bilayer graphene.
AB - We have investigated the atomic structure of superconducting Ca-intercalated bilayer graphene on a SiC(0001) substrate using total-reflection high-energy positron diffraction. By comparing the experimental rocking-curves with ones calculated for various structural models using a full-dynamical theory, we have found that Ca atoms are intercalated in the graphene-buffer interlayer, rather than between the two graphene layers. From transport measurements, the superconducting transition was observed to be at Tc onset = 4 K for this structure. This study is the first to clearly identify the relation between the atomic arrangement and superconductivity in Ca-intercalated bilayer graphene.
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U2 - 10.1016/j.carbon.2019.10.070
DO - 10.1016/j.carbon.2019.10.070
M3 - Article
AN - SCOPUS:85075469205
SN - 0008-6223
VL - 157
SP - 857
EP - 862
JO - Carbon
JF - Carbon
ER -