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To clarify superconductivity in EuFe2As2 hidden by antiferromagnetism ofEu2+, we investigated a Ca-substituted sample, Eu0.5Ca0.5Fe2As2, under highpressure. For ambient pressure, the sample exhibits a spin-density-wave (SDW)transition at TSDW = 191 K and antiferromagnetic order at TN = 4 K, but noevidence of superconductivity down to 2 K. The Ca-substitution certainlyweakens the antiferromagnetism. With increasing pressure, TSDW shifts to lowertemperature and becomes more unclear. Above 1.27 GPa, pressure-inducedsuperconductivity with zero resistivity is observed at around Tc = 20 K. At2.14 GPa, Tc reaches a maximum value of 24 K and the superconducting transitionbecomes the sharpest. These features of emergence of the superconductivity arequalitatively similar to those observed in AFe2As2 (A = Ba, Ca).

Pressure-induced superconductivity in Eu$_{0.5}$Ca$_{0.5}$Fe$_2$As$_2$ : FeAs-based superconductivity hidden by antiferromagnetism of Eu sublattice