Structural phase transition, $s_{\pm}$-wave pairing and magnetic stripe order in the bilayered nickelate superconductor La$_3$Ni$_2$O$_7$ under pressure
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| Format: | Preprint |
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2023
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| author | Zhang, Yang Lin, Ling-Fang Moreo, Adriana Maier, Thomas A. Dagotto, Elbio |
| author_facet | Zhang, Yang Lin, Ling-Fang Moreo, Adriana Maier, Thomas A. Dagotto, Elbio |
| contents | Motivated by the recently discovered high-$T_c$ superconductor La$_3$Ni$_2$O$_7$, we comprehensively study this system using density functional theory and random phase approximation calculations. At low pressures, the Amam phase is stable, containing the Y$^{2-}$ mode distortion from the Fmmm phase, while the Fmmm phase is unstable. Because of small differences in enthalpy and a considerable Y$^{2-}$ mode amplitude, the two phases may coexist in the range between 10.6 and 14 GPa, beyond which the Fmmm phase dominates. In addition, the magnetic stripe-type spin order with wavevector ($π$, 0) was stable at the intermediate region. Pairing is induced in the $s_{\pm}$-wave channel due to partial nesting between the {\bf M}=$(π, π)$ centered pockets and portions of the Fermi surface centered at the {\bf X}=$(π, 0)$ and {\bf Y}=$(0, π)$ points. This resembles results for iron-based superconductors but has a fundamental difference with iron pnictides and selenides. Moreover, our present efforts also suggest that La$_3$Ni$_2$O$_7$ is qualitatively different from infinite-layer nickelates and cuprate superconductors. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2307_15276 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Structural phase transition, $s_{\pm}$-wave pairing and magnetic stripe order in the bilayered nickelate superconductor La$_3$Ni$_2$O$_7$ under pressure Zhang, Yang Lin, Ling-Fang Moreo, Adriana Maier, Thomas A. Dagotto, Elbio Superconductivity Motivated by the recently discovered high-$T_c$ superconductor La$_3$Ni$_2$O$_7$, we comprehensively study this system using density functional theory and random phase approximation calculations. At low pressures, the Amam phase is stable, containing the Y$^{2-}$ mode distortion from the Fmmm phase, while the Fmmm phase is unstable. Because of small differences in enthalpy and a considerable Y$^{2-}$ mode amplitude, the two phases may coexist in the range between 10.6 and 14 GPa, beyond which the Fmmm phase dominates. In addition, the magnetic stripe-type spin order with wavevector ($π$, 0) was stable at the intermediate region. Pairing is induced in the $s_{\pm}$-wave channel due to partial nesting between the {\bf M}=$(π, π)$ centered pockets and portions of the Fermi surface centered at the {\bf X}=$(π, 0)$ and {\bf Y}=$(0, π)$ points. This resembles results for iron-based superconductors but has a fundamental difference with iron pnictides and selenides. Moreover, our present efforts also suggest that La$_3$Ni$_2$O$_7$ is qualitatively different from infinite-layer nickelates and cuprate superconductors. |
| title | Structural phase transition, $s_{\pm}$-wave pairing and magnetic stripe order in the bilayered nickelate superconductor La$_3$Ni$_2$O$_7$ under pressure |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2307.15276 |