Orbital Selective Superconductivity in a Two-band Model of Infinite-Layer Nickelates

• URL: http://arxiv.org/abs/2005.01243v1
• Date: Mon, 4 May 2020 03:06:41 GMT
• Title: Orbital Selective Superconductivity in a Two-band Model of Infinite-Layer Nickelates
• Authors: Priyo Adhikary, Subhadeep Bandyopadhyay, Tanmoy Das, Indra Dasgupta, Tanusri Saha-Dasgupta
• Abstract summary: We study superconductivity in NdNiO$$ and LaNiO$$ employing a first-principles derived low-energy model Hamiltonian.
• Score: 11.039153734289538
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In the present study, we explore superconductivity in NdNiO$_2$ and LaNiO$_2$ employing a first-principles derived low-energy model Hamiltonian, consisting of two orbitals: Ni $x^{2}$-$y^{2}$, and an {\it axial} orbital. The {\it axial} orbital is constructed out of Nd/La $d$, Ni 3$z^{2}$-$r^{2}$ 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 NdNiO$_2$ different from LaNiO$_2$, thereby controlling the inter-orbital Hubbard interaction assisted superconductivity.

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