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arXiv 2209.14746cond-mat.mtrl-sci
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CuCrO $_2$薄膜的扩散辅助分子束外延

Diffusion-assisted molecular beam epitaxy of CuCrO$_2$ thin films

Gaurab Rimal, Alessandro R. Mazza, Matthew Brahlek, Seongshik Oh

摘要:

使用分子束外延(MBE)来生长多元素氧化物(MEO)通常是具有挑战性的,部分是由于化学计量控制的困难。有时,如果其中一种元素在生长温度下是挥发性的,则可以使用吸附控制的生长模式来大大简化化学计量控制。否则,化学计量控制仍然是实现高质量MEO膜生长的主要障碍之一。在这里,我们报告了另一种自限生长模式,称为扩散辅助外延,其中多余的物种扩散到衬底中,并导致所需的化学计量,以类似于传统的吸附控制外延的方式。具体来说,我们证明,使用扩散辅助外延,高品质的外延CuCrO $_2$薄膜可以生长在一个宽的生长窗口,而无需精确的流量控制使用分子束外延。

英文摘要:

Using molecular beam epitaxy (MBE) to grow multi-elemental oxides (MEO) is generally challenging, partly due to difficulty in stoichiometry control. Occasionally, if one of the elements is volatile at the growth temperature, stoichiometry control can be greatly simplified using adsorption-controlled growth mode. Otherwise, stoichiometry control remains one of the main hurdles to achieving high quality MEO film growths. Here, we report another kind of self-limited growth mode, dubbed diffusion-assisted epitaxy, in which excess species diffuses into the substrate and leads to the desired stoichiometry, in a manner similar to the conventional adsorption-controlled epitaxy. Specifically, we demonstrate that using diffusion-assisted epitaxy, high-quality epitaxial CuCrO$_2$ films can be grown over a wide growth window without precise flux control using MBE.

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