Nickelate superconductors—a renaissance of the one-band Hubbard model
Motoharu Kitatani, Liang Si, Oleg Janson, Ryotaro Arita, Zhicheng Zhong, Karsten Held
Abstract
Abstract The recently discovered nickelate superconductors appear, at first glance, to be even more complicated multi-orbital systems than cuprates. To identify the simplest model describing the nickelates, we analyse the multi-orbital system and find that it is instead the nickelates which can be described by a one-band Hubbard model, albeit with an additional electron reservoir and only around the superconducting regime. Our calculations of the critical temperature T C are in good agreement with experiment, and show that optimal doping is slightly below 20% Sr-doping. Even more promising than 3 d nickelates are 4 d palladates.
Topics & Concepts
SuperconductivityHubbard modelThe RenaissanceCondensed matter physicsPhysicsDopingTheoretical physicsElectronHigh-temperature superconductivityMaterials scienceIron-based superconductors researchMagnetic and transport properties of perovskites and related materialsRare-earth and actinide compounds