Electron-phonon mediated superconductivity in La6Ni5O12 nickel oxides
Álvaro Adrián Carrasco Álvarez, Sébastien Petit, Lucia Iglesias, Manuel Bibes, Wilfrid Prellier, Julien Varignon
DOI 10.1103/PhysRevB.110.235107 · Physical Review B
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Abstract
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 Lan+1NinO2n+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 La6Ni5O12, yielding a computed critical temperature between Tc=11 and 19 K consistent with the 13 K observed experimentally in Nd6Ni5O12. Hence, an electron-phonon mechanism cannot be ruled out in nickelates. Finally, in order to identify the superconducting mechanism, extracting the relevant instabilities in the doping phase diagram of superconductors appears critical.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La6Ni5O12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
| Nd6Ni5O12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
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