Abstract
Two steps of resistance decreases were observed in cooling Ca1−xLaxFeAs2 (x = 0.18) single crystal under high-pressure condition. The temperature T1 at which the high-T decrease takes place shows little pressure dependence. On the other hand, the low-T decrease was ascribed to a superconducting transition for the zero resistance. With elevating pressure P, both the onset and zero-resistance transition Tc's first increase and then decrease continuously, showing a dome-shape pressure phase diagram with an optimal pressure around 1.19 GPa. The positive-pressure effect of the superconducting transition demonstrates the possibility of exploring higher Tc's in the present material.
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