Two-orbital view on the origin of the material dependence of Tc in the single-layer cuprates

Abstract

Using the dx2-y2+dz2 two orbital model of the high Tc cuprates obtained from the first-principle calculation, we show that the material dependence of the Fermi surface shape can be understood by the degree of the mixture between the dx2-y2$ and the dz2 orbitals. We explain, through investigating the tightbinding hopping integrals, why some cuprates have square shaped Fermi surface, while others have more rounded ones. From this viewpoint, we explain the experimentally observed correlation between the curvature of the Fermi surface and Tc.

4 pages, 4 figures

References in corpus (7)

• Maximally-localized Wannier functions for entangled energy bands
• Band-structure trend in hole-doped cuprates and correlation with Tcmax
• Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor
• Enhancement of Pairing Correlation by t' in the Two-Dimensional Extende d t-J Model
• Effects of next-nearest-neighbor hopping $t^{\prime }$ on the electronic structure of cuprates
• Combined density-functional and dynamical cluster quantum Monte Carlo calculations for three-band Hubbard models for hole-doped cuprate superconductors
• Spin-fluctuation mechanism of superconductivity in cuprates