On the oxygen p states in superconducting nickelates

2024/10/09 by Lechermann, Frank
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.2410.06891

Abstract

While key attention in transition-metal oxides is usually devoted to the d states of the transition-metal ion, the O(2p) states usually also carry important physics. We here examine these p states in representatives of the novel superconducting nickelates, as described in realistic dynamical mean-field theory. Since the materials are located on the boundary between Mott-Hubbard and charge-transfer systems, the role of oxygen is expectedly subtle. Strong reduction of doped holes on oxygen and first asymmetry effects are featured in infinite-layer nickelates. A pronounced nature of bridging p_z orbitals is identified in the La₃Ni₂O₇ system.

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