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

Physics

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

B. Kang, C. Melnick, et al.

Discover the intriguing findings of Byungkyun Kang and colleagues as they explore superconductivity in hole-doped infinite-layer nickelate Nd₁₋ₓSrₓNiO₂. Their groundbreaking research reveals how Hund's coupling in Ni-$d$ orbitals signals the emergence of a new class of Hund's metals, setting the stage for novel insights into correlated quantum materials.

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Playback language: English
Abstract
The discovery of superconductivity in hole-doped infinite-layer nickelate Nd₁₋ₓSrₓNiO₂ has sparked interest in correlated quantum materials. This study uses ab initio LQSGW+DMFT methodology to investigate the temperature and doping dependence of the local spectrum and susceptibilities. Results indicate that Hund's coupling in Ni-$d$ orbitals leads to multiple signatures of a Hund's metallic phase in Ni-$e_g$ orbitals, differing from Fe-based superconductors and cuprates. This finding reveals a new class of Hund's metals with implications for correlated two-orbital systems.
Publisher
npj Quantum Materials
Published On
Jul 12, 2023
Authors
Byungkyun Kang, Corey Melnick, Patrick Semon, Siheon Ryee, Myung Joon Han, Gabriel Kotliar, Sangkan Choi
Tags
superconductivity
Hund's coupling
correlated quantum materials
nickelate
LQSGW+DMFT
Ni-$d$ orbitals
two-orbital systems

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