@article{oai:kyutech.repo.nii.ac.jp:00005789,
 author = {Matsuhira, Kazuyuki and 松平, 和之 and Nakamura, Kazuma and 中村, 和磨 and Yasukuni, Yuki and Yoshimoto, Yoshihide and Hirai, Daigorou and Hiroi, Zenji},
 issue = {1},
 journal = {Journal of the Physical Society of Japan},
 month = {Dec},
 note = {We report the discovery of nonlinear conductivity along the c-axis in a single crystal of Ca5Ir3O12, which indicates a semiconducting behavior with a narrow band gap of ∼0.2 eV. The resistivity decreases with increase in the applied current. This nonlinearity is reversible with the direction of current. We also show the ab initio density functional band structures and the Fermi surface. We found that the spin–orbit interactions result in an appreciable change in the low-energy electronic structure; the interaction splits the metallic bands and leads to a pocket-like band structure, thus reducing the metallic trend. The size of the spin–orbit interaction is estimated as ∼0.3 eV, which is large enough to be comparable to the valence bandwidth of ∼0.5 eV. The Fermi surface exhibits a sheet structure along the c*-axis, due to the 1D chain structure of edge-sharing IrO6.},
 pages = {013703-1--013703-5},
 title = {Nonlinear Conductivity of Geometrically Frustrated Iridate Ca5Ir3O12},
 volume = {87},
 year = {2017},
 yomi = {マツヒラ, カズユキ and ナカムラ, カズマ}
}