@article{oai:repository.lib.tottori-u.ac.jp:00007324,
 author = {Sakakibara, Hirofumi and Usui, Hidetomo and Kuroki, Kazuhiko and Arita, Ryotaro and Aoki, Hideo},
 journal = {Physical review letters, Physical review letters},
 month = {Jul},
 note = {In order to explore the reason why the single-layered cuprates, La2−x(Sr/Ba)xCuO4 (Tc≃40  K) and HgBa2CuO4+δ (Tc≃90  K) have such a significant difference in Tc, we study a two-orbital model that incorporates the dz2 orbital on top of the dx2−y2 orbital. It is found, with the fluctuation exchange approximation, that the dz2 orbital contribution to the Fermi surface, which is stronger in the La system, works against d-wave superconductivity, thereby dominating over the effect of the Fermi surface shape. The result resolves the long-standing contradiction between the theoretical results on Hubbard-type models and the experimental material dependence of Tc in the cuprates.},
 title = {Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor},
 volume = {105},
 year = {2010}
}