具有Skutterudite中间层的铁磷属元素化物中的压力诱导超导电性及其与掺杂诱导超导电性的标度
Pressure-Induced Superconductivity and Its Scaling with Doping-Induced Superconductivity in the Iron Pnictide with Skutterudite Intermediary Layers
摘要：
Ca_（10）（PtnAs_8）（Fe_2As_2）_5（n= 3，4）化合物是一种新型的铁磷属元素化物超导体，其结构由Ca-PtnAs_8-Ca-Fe_2As_2层堆叠而成。当n=3（10-3-8相）时，未掺杂的化合物是反铁磁（AFM）半导体，而当n=4（10-4-8相）时，未掺杂的化合物是转变温度为26 K的超导体。在这里，我们报告的10-3-8化合物通过原位电阻，磁化率和霍尔系数测量的组合获得的高压研究的结果。我们发现在3.5 GPa压力范围内，它的原子力显微镜（AFM）有序度被完全抑制，然后在3.5-7 GPa压力范围内出现超导态。超导转变温度与压力的关系呈圆顶状。
英文摘要：
The Ca10(PtnAs8)(Fe2As2)5 (n=3,4) compounds are a new type of iron pnictide superconductors whose structures consist of stacking Ca-PtnAs8-Ca-Fe2As2 layers in a unit cell. When n=3 (the 10-3-8 phase), the undoped compound is an antiferromagnetic (AFM) semiconductor, while, when n=4 (the 10-4-8 phase), the undoped compound is a superconductor with the transition temperature of 26K. Here we report the results of high-pressure studies on the 10-3-8 compound obtained through a combination of in-situ resistance, magnetic susceptibility, and Hall coefficient measurements. We find that its AFM order can be suppressed completely at 3.5 GPa and then superconducting state appears in the pressure range of 3.5-7 GPa. The pressure dependence of superconducting transition temperature displays a dome-like shape.
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