Doping induced singlet to triplet superconducting transition in Ba$_{2}$CuO$_{3+δ}$
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arXiv
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| Format: | Preprint |
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2024
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| author | Adhikary, Priyo Gupta, Mayank Nanda, B. R. K. Mukherjee, Shantanu |
| author_facet | Adhikary, Priyo Gupta, Mayank Nanda, B. R. K. Mukherjee, Shantanu |
| contents | In this study, we perform a numerical simulation on the recently discovered high-temperature superconductor ($T_c$= 73K) Ba$_2$CuO$_{3.2}$ \cite{lietal} while focusing on doping dependence of alternating CuO$_6$ octahedra and CuO chain-like 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 Ba$_2$CuO$_{3+δ}$, a singlet $d_{x^2-y^2}$-wave pairing symmetry emerges as long as we keep the doping below the critical value $x_{c}$. 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 $d_{z^2}$ and $d_{x^2-y^2}$ orbitals within the CuO$_6$ octahedra. This triplet state is attainable through hole doping, while supressing inter-layer self-doping effects. Furthermore, we present the density of states within the superconducting phase, offering a potential comparison with tunnelling spectra in Ba$_2$CuO$_{3+δ}$. Our research provides novel insights into the intricate pairing symmetries in Ba$_2$CuO$_{3+δ}$ and their underlying pairing mechanisms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_09349 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Doping induced singlet to triplet superconducting transition in Ba$_{2}$CuO$_{3+δ}$ Adhikary, Priyo Gupta, Mayank Nanda, B. R. K. Mukherjee, Shantanu Superconductivity In this study, we perform a numerical simulation on the recently discovered high-temperature superconductor ($T_c$= 73K) Ba$_2$CuO$_{3.2}$ \cite{lietal} while focusing on doping dependence of alternating CuO$_6$ octahedra and CuO chain-like 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 Ba$_2$CuO$_{3+δ}$, a singlet $d_{x^2-y^2}$-wave pairing symmetry emerges as long as we keep the doping below the critical value $x_{c}$. 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 $d_{z^2}$ and $d_{x^2-y^2}$ orbitals within the CuO$_6$ octahedra. This triplet state is attainable through hole doping, while supressing inter-layer self-doping effects. Furthermore, we present the density of states within the superconducting phase, offering a potential comparison with tunnelling spectra in Ba$_2$CuO$_{3+δ}$. Our research provides novel insights into the intricate pairing symmetries in Ba$_2$CuO$_{3+δ}$ and their underlying pairing mechanisms. |
| title | Doping induced singlet to triplet superconducting transition in Ba$_{2}$CuO$_{3+δ}$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2401.09349 |