Synthesis of infinite-layer LaNiO2 films by metal-organic deposition

Details Synthesis of infinite-layer LaNiO2 films by metal-organic deposition Synthesis of infinite-layer LaNiO2 films by metal-organic deposition

2008-11-12

arxiv.org/abs/0811.1858v1

Physics

Condensed Matter

Superconductivity

13 pages, 4 figures

Scientific paper

We report the synthesis of infinite-layer LaNiO2 thin films by metal organic decomposition. Our work is aimed to synthesize perovskite-like oxides with 3d9 electronic configuration, which is common to high-Tc copper oxides. The 3d9 configuration is very rare in oxides other than cuprates. Ni1+ oxides, even though Ni1+ is an unusual oxidation state, may be one of very few candidates. One example of the Ni1+ phases is infinite-layer LaNiO2. The bulk synthesis of LaNiO2 is difficult, but we demonstrate in this article that the thin-film synthesis of LaNiO2 by metal organic decomposition is rather easy. This is due to the advantage of thin films with a large-surface-to-volume ratio, which makes oxygen diffusion prompt. Resistivity measurements indicate that LaNiO2 is essentially a metal but unfortunately with no trace of superconductivity yet.

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