金属有机物沉积法制备无限层LaNiO2薄膜
Synthesis of infinite-layer LaNiO2 films by metal-organic deposition
摘要：
本文报道了用金属有机物分解法制备无限层LaNiO_2薄膜。我们的工作旨在合成具有3d9电子构型的类钙钛矿氧化物，这是高Tc铜氧化物所共有的。3d9组态在铜酸盐以外的氧化物中非常罕见。Ni1+氧化物，即使Ni1+是一种不寻常的氧化态，可能是极少数的候选者之一。Ni1+相的一个实例是无限层LaNiO2。LaNiO2的本体合成是困难的，但在这篇文章中，我们表明，薄膜合成LaNiO2的金属有机分解是相当容易的。这是由于薄膜具有大的表面体积比的优点，这使得氧扩散迅速。电阻率测量表明LaNiO2本质上是一种金属，但不幸的是还没有超导性的痕迹。
英文摘要：
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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