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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
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.
Publisher
American Physical Society
Content Type
Journal Article
Link
ISSN・ISBN
00319007
NCID
AA00773679
Journal Title
Physical review letters
Volume
105
Start Page
057003
Published Date
2010-07-30
Publisher-DOI
Text Version
Publisher
Rights
©2010 American Physical Society
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
Department
Faculty of Engineering/Graduate School of Engineering
Language
English