论文标题
分子束外延的制备和原位表征狂热薄膜
Molecular beam epitaxy preparation and in situ characterization of FeTe thin films
论文作者
论文摘要
我们已经在Te限制的生长条件下通过分子束外疗（MBE）合成了Fe $ _ {1+y} $ te薄膜。我们发现，对于多种过量的Fe值，可以逐层生长逐层生长，这比散装材料上已知的范围更大。使用X射线磁性圆形二分色谱谱图在Fe l $ _ {2,3} $和TE M $ _ {4,5} $边缘的情况下，我们观察到具有高过量Fe的胶片包含铁磁簇，而具有较低多余的Fe的膜仍不是非磁性的。此外，X射线吸收光谱表明，可以获得具有非常相似的电子结构的膜与高质量的单晶Fe $ _ {1.14} $ TE的膜。我们的结果表明，具有Te限制增长的MBE可能会提供机会，可以合成较少量过多的FE的宴会薄膜，从而更接近可能的超导阶段。
We have synthesized Fe$_{1+y}$Te thin films by means of molecular beam epitaxy (MBE) under Te-limited growth conditions. We found that epitaxial layer-by-layer growth is possible for a wide range of excess Fe values, wider than expected from what is known on the bulk material. Using x-ray magnetic circular dichroism spectroscopy at the Fe L$_{2,3}$ and Te M$_{4,5}$ edges, we observed that films with high excess Fe contain ferromagnetic clusters while films with lower excess Fe remain nonmagnetic. Moreover, x-ray absorption spectroscopy showed that it is possible to obtain films with very similar electronic structure as that of a high quality bulk single crystal Fe$_{1.14}$Te. Our results suggest that MBE with Te-limited growth may provide an opportunity to synthesize FeTe films with smaller amounts of excess Fe as to come closer to a possible superconducting phase.
