论文标题
通过扩散控制，Fe-pnictide杂音中的可调超导性
Tunable superconductivity in Fe-pnictide heterointerfaces by diffusion control
论文作者
论文摘要
lnofeas/bafe $ _2 $ as $ _2 $（ln = la，sm）的新型Fe-Pnictide异质结构是由脉冲激光沉积（PLD）种植的。它们的[Fe $ _2 $ AS $ _2 $]的常见结构单元可以在不同的Fe-Pnictide单位单元格与连贯且原子上尖锐的界面之间进行完美匹配。 We test the stability of the heterointerface in the presence of Co$^{2+}$ (cations) as well as for excess O$^{2-}$ (anions) and discuss the consequences on the electronic properties: While undoped SmOFeAs/BaFe$_2$As$_2$ remains non-superconducting, a balanced Co-concentration after diffusion across the interface results in superconductivity within共同取代的变体。相反，多余的O $^{2 - } $导致在Smofeas/Bafe $ _2 $中形成界面层AS $ _2 $，增加了O $^{2 - } $/AS $^{2 - } $/as $^{3 - } $比率，并与时间一起开发金属到纤维的转换。工程化的杂项可能会提供一条复杂的途径，以弥合Fe-Pnictides和Fe-Chalcogenides之间的差距。
New Fe-pnictide heterostructures of the type LnOFeAs/BaFe$_2$As$_2$ (Ln = La, Sm) were grown by pulsed laser deposition (PLD) and investigated. Their common structural unit of [Fe$_2$As$_2$] planes allows perfect matching between the different Fe-pnictide unit cells and a coherent and atomically sharp interface. We test the stability of the heterointerface in the presence of Co$^{2+}$ (cations) as well as for excess O$^{2-}$ (anions) and discuss the consequences on the electronic properties: While undoped SmOFeAs/BaFe$_2$As$_2$ remains non-superconducting, a balanced Co-concentration after diffusion across the interface results in superconductivity within Co-substituted variants. In contrast, excess O$^{2-}$ causes the formation of an interfacial layer in SmOFeAs/BaFe$_2$As$_2$ with increased O$^{2-}$/As$^{3-}$ ratio and develops a metal-to-superconductor transition with time. The engineered heterointerfaces may provide a sophisticated pathway to bridge the gap between Fe-pnictides and Fe-chalcogenides.
