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

• Sakakibara, Hirofumi

• Usui, Hidetomo

• Kuroki, Kazuhiko

• Arita, Ryotaro

• Aoki, Hideo

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.

Journal

• Physical review letters

  Physical review letters 105 057003-, 2010-07-30

  American Physical Society

Details

• CRID: 1050296829526961280
• NII Article ID: 120006724707
• NII Book ID: AA00773679
• ISSN: 00319007
• Web Site: https://repository.lib.tottori-u.ac.jp/records/7324
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles