Physics – Condensed Matter – Superconductivity
Scientific paper
2010-03-09
Phys. Rev. Lett. 105, 057003 (2010)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures. Final version published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.105.057003
In order to explore the reason why the single-layered cuprates, La$_{2-x}$(Sr/Ba)$_x$CuO$_4$ ($T_c\simeq$ 40K) and HgBa$_2$CuO$_{4+\delta}$ ($T_c\simeq$ 90K), have such a significant difference in $T_c$, we study a two-orbital model that incorporates the $d_{z^2}$ orbital on top of the $d_{x^2-y^2}$ orbital. It is found, with the fluctuation exchange approximation, that the $d_{z^2}$ 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 $T_c$ in the cuprates.
Aoki Hideo
Arita Ryotaro
Kuroki Kazuhiko
Sakakibara Hirofumi
Usui Hidetomo
No associations
LandOfFree
Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-454263