Doping-induced singlet-to-triplet superconducting transition in Ba2CuO3+δ
Priyo Adhikary, Mayank Gupta, B. R. K. Nanda, Shantanu Mukherjee
DOI 10.1103/PhysRevB.109.224503 · Physical Review B
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Abstract
In this paper, we perform a numerical simulation on the recently discovered high-temperature superconductor (Tc=73 K) Ba2CuO3.2 while focusing on doping dependence of alternating CuO6 octahedra and CuO chainlike states. Employing the multiband random phase approximation, we compute the spin-fluctuation mediated pairing interaction, subsequently determining its pairing eigenvalues and eigenfunctions relative to oxygen-doping levels. We find that, for the certain range of hole doping in Ba2CuO3+δ, a singlet dx2−y2-wave pairing symmetry emerges if we keep the doping below the critical value xc. Interestingly, upon hole doping, the dominant pairing symmetry undergoes a transition to a triplet (odd paring) type from the singlet state. This change in pairing is driven by the competition between the nesting vectors coming from the Fermi surface of dz2 and dx2−y2 orbitals within the CuO6 octahedra. This triplet state is attainable through hole doping, while suppressing interlayer self-doping effects. Furthermore, we present the density of states within the superconducting phase, offering a potential comparison with tunneling spectra in Ba2CuO3+δ. Our research provides insights into the intricate pairing symmetries in Ba2CuO3+δ and their underlying pairing mechanisms.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2CuO3.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 73 | Pressure not reported | unknown |
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