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

Priyo Adhikary; Subhadeep Bandyopadhyay; Tanmoy Das; Indra Dasgupta; Tanusri Saha-Dasgupta

doi:10.1103/PhysRevB.102.100501

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

Superconductivity 2020-09-09 v1 Quantum Physics

Authors: Priyo Adhikary , Subhadeep Bandyopadhyay , Tanmoy Das , Indra Dasgupta , Tanusri Saha-Dasgupta

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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.

Keywords

infinite-layer nickelates orbital-selective superconductivity two-band model inter-orbital hubbard interaction spin-fluctuation mediated pairing axial orbital

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@article{arxiv.2005.01243,
  title  = {Orbital Selective Superconductivity in a Two-band Model of Infinite-Layer Nickelates},
  author = {Priyo Adhikary and Subhadeep Bandyopadhyay and Tanmoy Das and Indra Dasgupta and Tanusri Saha-Dasgupta},
  journal= {arXiv preprint arXiv:2005.01243},
  year   = {2020}
}

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6 pages, 4 figures

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

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