Electron-phonon mediated superconductivity in La$_6$Ni$_5$O$_{12}$ nickel oxides
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909992260468736 |
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| author | Alvarez, Alvaro Adrian Carrasco Petit, Sebastien Iglesias, Lucia Bibes, Manuel Prellier, Wilfrid Varignon, Julien |
| author_facet | Alvarez, Alvaro Adrian Carrasco Petit, Sebastien Iglesias, Lucia Bibes, Manuel Prellier, Wilfrid Varignon, Julien |
| contents | Nickel oxide superconductors offer an alternative playground for understanding the formation of Cooper pairs in correlated materials such as the famous cuprates. By studying the La$_{n+1}$Ni$_n$O$_{2n+2}$ phase diagram on the basis of hybrid and spin-polarized density functional theory simulations, we reveal the existence of charge and bond ordered (CBO) insulating phases that are quenched by doping effects, ultimately resulting in a metallic phase at the n=5 member. Nevertheless, the phonons associated with the CBO identified in the phase diagram remain sufficiently large to mediate Cooper pairs in La$_6$Ni$_5$O$_{12}$, yielding a computed critical temperature between T$_c$=11-19K consistent with the 13K observed experimentally in Nd$_6$Ni$_5$O$_{12}$. Thus, in order to identify the superconducting mechanism, extracting the relevant instabilities in the doping phase diagram of superconductors appears critical. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2311_13674 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Electron-phonon mediated superconductivity in La$_6$Ni$_5$O$_{12}$ nickel oxides Alvarez, Alvaro Adrian Carrasco Petit, Sebastien Iglesias, Lucia Bibes, Manuel Prellier, Wilfrid Varignon, Julien Superconductivity Materials Science Nickel oxide superconductors offer an alternative playground for understanding the formation of Cooper pairs in correlated materials such as the famous cuprates. By studying the La$_{n+1}$Ni$_n$O$_{2n+2}$ phase diagram on the basis of hybrid and spin-polarized density functional theory simulations, we reveal the existence of charge and bond ordered (CBO) insulating phases that are quenched by doping effects, ultimately resulting in a metallic phase at the n=5 member. Nevertheless, the phonons associated with the CBO identified in the phase diagram remain sufficiently large to mediate Cooper pairs in La$_6$Ni$_5$O$_{12}$, yielding a computed critical temperature between T$_c$=11-19K consistent with the 13K observed experimentally in Nd$_6$Ni$_5$O$_{12}$. Thus, in order to identify the superconducting mechanism, extracting the relevant instabilities in the doping phase diagram of superconductors appears critical. |
| title | Electron-phonon mediated superconductivity in La$_6$Ni$_5$O$_{12}$ nickel oxides |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2311.13674 |