Investigation of hydrogen incorporations in bulk infinite-layer nickelates

Abstract

Infinite-layer (IL) nickelates are an emerging class of superconductors, where the Ni${}^{1+}$ valence state in a square planar NiO${}_2$ coordination can only be reached via topotactic reduction of the perovskite phase. However, this topotactic soft chemistry with hydrogenous reagents is still at a stage of rapid development, and there is a number of open issues, especially considering the possibility of hydrogen incorporation. Here we study the time dependence of the topotactic transformation of LaNiO${}_3$ to LaNiO${}_2$ for powder samples with x-ray diffraction and gas extraction techniques. While the hydrogen content of the powder increases with time, neutron diffraction shows no negative scattering of hydrogen in the LaNiO${}_2$ crystal lattice. The extra hydrogen appears to be confined to grain boundaries or secondary-phase precipitates. The average crystal structure, and possibly also the physical properties, of the primary LaNiO${}_2$ phase are therefore not noticeably affected by hydrogen residues created by the topotactic transformation.

References in corpus (12)

• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• A superconducting praseodymium nickelate with infinite layer structure
• Nickelate superconductivity without rare-earth magnetism: (La,Sr)NiO${}_2$
• Synthesis and characterization of bulk Nd1-xSrxNiO2 and Nd1-xSrxNiO3
• Bipartite magnetic parent phases in the iron-oxypnictide superconductor
• Hydrogen in layered iron arsenide: indirect electron doping to induce superconductivity
• Topotactic transformation of single-crystals: from perovskite to infinite-layer nickelates
• Magnetic correlations in infinite-layer nickelates: an experimental and theoretical multi-method study
• Preparation of superconducting thin films of infinite-layer nickelate Nd${}_{0.8}$Sr${}_{0.2}$NiO${}_2$
• Impact of Cation Stoichiometry on the Crystalline Structure and Superconductivity in Nickelates
• Geometric effects in the infinite-layer nickelates
• Structural instabilities of infinite-layer nickelates from first-principles simulations

Cited by in corpus (6)

• Synthesis and physical properties of LaNiO${}_2$ crystals
• Synthesis of thin film infinite-layer nickelates by atomic hydrogen reduction: clarifying the role of the capping layer
• Topotactic-hydrogen forms chains in $AB$O${}_2$ nickelate superconductors
• Phase formation in hole- and electron-doped rare-earth nickelate single crystals
• Signatures of topotactic hydrogen in nickelate superconductors
• Investigation of spin excitations and charge order in bulk crystals of the infinite-layer nickelate LaNiO${}_2$