Abstract
Using a tight-binding two-orbital (dx2-y2, d3z2-r2) model and a random phase approximation treatment of the spin-fluctuation pairing vertex, we calculate the pairing strengths for a cuprate model in which the hole doping varies from Cu2+ to Cu3+. We find two domes of pairing strength: one corresponding to the traditional low hole doping regime and the other to the extremely overdoped regime discussed by Geballe and Marezio [Physica C 469, 680 (2009)PHYCE60921-453410.1016/j.physc.2009.03.054]. In the overdoped regime we find that there is significant pairing strength in both the d-wave and s± channels.
| Original language | English |
|---|---|
| Article number | 224515 |
| Journal | Physical Review B |
| Volume | 99 |
| Issue number | 22 |
| DOIs | |
| State | Published - Jun 27 2019 |
Funding
The possibility of another region of superconductivity in the extremely overdoped cuprates was proposed to one of us by Theodore H. Geballe a number of years ago. We thank S. Uchida for discussions regarding the structure of the oxygen-efficient 214 cuprates. The DFT calculations, the derivation of the tight-binding model (T.B.), and the analysis of the results (D.J.S.) were supported by the Scientific Discovery through the Advanced Computing (SciDAC) program funded by U.S. Department of Energy, Office of Science, Advanced Scientific Computing Research and Basic Energy Sciences, Division of Materials Sciences and Engineering. The RPA calculations (T.M.) were supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division.