Superconducting Instabilities in Strongly Correlated Infinite-Layer Nickelates
Andreas Kreisel, Brian M. Andersen, Astrid T. Rømer, Ilya M. Eremin, Frank Lechermann
DOI 10.1103/PhysRevLett.129.077002 · Physical Review Letters
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Abstract
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 dx2−y2 and dz2 orbitals as well as the self-doping band, we uncover a transition from d-wave pairing symmetry to nodal s± superconductivity, driven by strong fluctuations in the dz2-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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