Infinite-layer nickelates as Ni-eg Hund's metals

Abstract

The recent and exciting discovery of superconductivity in the hole-doped infinite-layer nickelate Nd 1-δ Sr δ NiO 2 draws strong attention to correlated quantum materials. From a theoretical view point, this new class of unconventional superconducting materials provides an opportunity to unveil new physics in correlated quantum materials. Here we study the temperature and doping dependence of the local spectrum as well as the charge, spin and orbital susceptibilities from first principles. By using ab initio LQSGW+DMFT methodology, we show that onsite Hund's coupling in Ni-d orbitals gives rise to multiple signatures of Hund's metallic phase in Ni-eg orbitals. The proposed picture of the nickelates as an eg (two orbital) Hund's metal differs from the picture of the Fe-based superconductors as a five orbital Hund's metal as well as the picture of the cuprates as doped charge transfer insulators. Our finding unveils a new class of the Hunds metals and has potential implications for the broad range of correlated two orbital systems away from half-filling.

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• Low Valence Nickelates: Launching the Nickel Age of Superconductivity
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• Hund physics landscape of two-orbital system
• Possible structural quantum criticality tuned by rare-earth ion substitution in infinite-layer nickelates
• Orbital isotropy of magnetic fluctuations in correlated electron materials induced by Hund's exchange coupling