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We report measurements of the pressure dependence of the superconductingtransition temperature T_c in single crystal samples of the rare-earth dopedsuperconductor Ca$_{0.73}$La$_{0.27}$Fe$_2$As$_2$. We track T_c with twotechniques, via in-plane resistivity measurements and with a resonant tunneldiode oscillator circuit which is sensitive to the skin depth. We show thatinitially T_c rises steeply with pressure, forming a superconducting dome witha maximum T_c of ~44 K at 20 kbar. We discuss this observation in the contextof other electron-doped iron pnictide superconductors, and conclude that theapplication of pressure offers an independent way to tune T_c in this system.

Enhancement of the Superconducting Transition Temperature under Pressure in Rare-Earth Doped Ca$_{1-x}$La$_x$Fe$_2$As$_2$ (x=0.27)