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| Authors |
Sakakibara, Hirofumi
Department of Applied Physics and Chemistry, The University of Electro-Communications
Researchers DB
KAKEN
Usui, Hidetomo
Department of Applied Physics and Chemistry, The University of Electro-Communications
Kuroki, Kazuhiko
Department of Applied Physics and Chemistry, The University of Electro-Communications / JST, TRIP
Arita, Ryotaro
Department of Applied Physics, The University of Tokyo / JST, TRIP / JST, CREST
Aoki, Hideo
Department of Physics, The University of Tokyo / JST, TRIP
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| Abstract | 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.
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| Publisher | American Physical Society
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| Content Type |
Journal Article
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| Link | |
| ISSN | 00319007
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| NCID | AA00773679
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| Journal Title | Physical review letters
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| Volume | 105
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| Start Page | 057003
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| Published Date | 2010-07-30
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| Publisher-DOI | |
| Text Version |
Publisher
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| Rights | ©2010 American Physical Society
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| Citation | H. Sakakibara, H. Usui, K. Kuroki, R. Arita and H. Aoki. Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor. Physical review letters. 2010, 105, 057003
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| Department |
Faculty of Engineering/Graduate School of Engineering
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| Language |
English
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