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The Ca10(PtnAs8)(Fe2As2)5 (n=3,4) compounds are a new type of iron pnictidesuperconductors whose structures consist of stacking Ca-PtnAs8-Ca-Fe2As2 layersin a unit cell. When n=3 (the 10-3-8 phase), the undoped compound is anantiferromagnetic (AFM) semiconductor, while, when n=4 (the 10-4-8 phase), theundoped compound is a superconductor with the transition temperature of 26K.Here we report the results of high-pressure studies on the 10-3-8 compoundobtained through a combination of in-situ resistance, magnetic susceptibility,and Hall coefficient measurements. We find that its AFM order can be suppressedcompletely at 3.5 GPa and then superconducting state appears in the pressurerange of 3.5-7 GPa. The pressure dependence of superconducting transitiontemperature displays a dome-like shape.

Pressure-Induced Superconductivity and Its Scaling with Doping-Induced Superconductivity in the Iron Pnictide with Skutterudite Intermediary Layers