Dynamically screened Coulomb interaction in the parent compounds of hole-doped cuprates: Trends and exceptions
Research output: Contribution to journal › Article
Although cuprate high-temperature superconductors were discovered already in 1986 the origin of the pairing mechanism remains elusive. While the doped compounds are superconducting with high transition temperatures Tc, the undoped compounds are insulating due to the strong effective Coulomb interaction between the Cu 3d holes. We investigate the dependence of the maximum superconducting transition temperature Tcmax on the on-site effective Coulomb interaction U using the constrained random-phase approximation. We focus on the commonly used one-band model of the cuprates, including only the antibonding combination of the Cu dx2-y2 and O px and py orbitals and find a screening-dependent trend between the static value of U and Tcmax for the parent compounds of a large number of hole-doped cuprates. Our results suggest that superconductivity may be favored by a large on-site Coulomb repulsion. We analyze both the trend in the static value of U and its frequency dependence in detail and, by comparing our results to other works, speculate on the mechanisms behind the trend.
|Research areas and keywords||
Subject classification (UKÄ) – MANDATORY
|Journal||Physical Review B|
|Publication status||Published - 2019 Feb 19|