Orbital Selective Superconductivity in a Two-band Model of Infinite-Layer Nickelates
Abstract
In the present study, we explore superconductivity in NdNiO2 and LaNiO2 employing a first-principles derived low-energy model Hamiltonian, consisting of two orbitals: Ni x2-y2, and an axial orbital. The axial orbital is constructed out of Nd/La d, Ni 3z2-r2 and Ni s characters. Calculation of the superconducting pairing symmetry and pairing eigenvalue of the spin-fluctuation mediated pairing interaction underlines the crucial role of inter-orbital Hubbard interaction in superconductivity, which turns out to be orbital-selective. The axial orbital brings in materials dependence in the problem, making NdNiO2 different from LaNiO2, thereby controlling the inter-orbital Hubbard interaction assisted superconductivity.
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