Topotactic hydrogen in nickelate superconductors and akin infinite-layer oxides ABO2

Liang Si; Wen Xiao; Josef Kaufmann; Jan M. Tomczak; Yi Lu; Zhicheng Zhong; Karsten Held

doi:10.1103/PhysRevLett.124.166402

paper

Topotactic hydrogen in nickelate superconductors and akin infinite-layer oxides ABO2

arXiv:1911.06917 · doi:10.1103/PhysRevLett.124.166402

Abstract

Superconducting nickelates appear to be difficult to synthesize. Since the chemical reduction of ABO3 (A: rare earth; B transition metal) with CaH2 may result in both, ABO2 and ABO2H, we calculate the topotactic H binding energy by density functional theory (DFT). We find intercalating H is energetically favorable for LaNiO2 but not for Sr-doped NdNiO2. This has dramatic consequences for the electronic structure as determined by DFT+dynamical mean field theory: that of 3d9 LaNiO2 is similar to (doped) cuprates, 3d8 LaNiO2H is a two-orbital Mott insulator. Topotactical H might hence explain why some nickelates are superconducting and others are not.

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