Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor

Hirofumi Sakakibara, Hidetomo Usui, Kazuhiko Kuroki, Ryotaro Arita, and Hideo Aoki
Phys. Rev. Lett. 105, 057003 – Published 30 July 2010

Abstract

In order to explore the reason why the single-layered cuprates, La2x(Sr/Ba)xCuO4 (Tc40K) and HgBa2CuO4+δ (Tc90K) have such a significant difference in Tc, we study a two-orbital model that incorporates the dz2 orbital on top of the dx2y2 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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  • Received 3 March 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.057003

©2010 American Physical Society

Authors & Affiliations

Hirofumi Sakakibara1, Hidetomo Usui1, Kazuhiko Kuroki1,4, Ryotaro Arita2,4,5, and Hideo Aoki3,4

  • 1Department of Applied Physics and Chemistry, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
  • 2Department of Applied Physics, The University of Tokyo, Hongo, Tokyo 113-8656, Japan
  • 3Department of Physics, The University of Tokyo, Hongo, Tokyo 113-0033, Japan
  • 4JST, TRIP, Sanbancho, Chiyoda, Tokyo 102-0075, Japan
  • 5JST, CREST, Hongo, Tokyo 113-8656, Japan

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Issue

Vol. 105, Iss. 5 — 30 July 2010

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