Superconducting Instabilities in Strongly Correlated Infinite-Layer Nickelates,Physical Review Letters

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Superconducting Instabilities in Strongly Correlated Infinite-Layer Nickelates
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-08-11 , DOI: 10.1103/physrevlett.129.077002
Andreas Kreisel ₁ , Brian M Andersen ₂ , Astrid T Rømer ₂ , Ilya M Eremin ₃ , Frank Lechermann ₃

Affiliation

The discovery of superconductivity in infinite-layer nickelates has added a new family of materials to the fascinating growing class of unconventional superconductors. By incorporating the strongly correlated multiorbital nature of the low-energy electronic degrees of freedom, we compute the leading superconducting instability from magnetic fluctuations relevant for infinite-layer nickelates. Specifically, by properly including the doping dependence of the Ni

d_{x^{2} - y^{2}}

and

d_{z^{2}}

orbitals as well as the self-doping band, we uncover a transition from

d

-wave pairing symmetry to nodal

s_{\pm}

superconductivity, driven by strong fluctuations in the

d_{z^{2}}

-dominated orbital states. We discuss the properties of the resulting superconducting condensates in light of recent tunneling and penetration depth experiments probing the detailed superconducting gap structure of these materials.

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