Tunable superconductivity in parent cuprate Pr$_{2}$CuO$_{4\pmδ}$ thin films

Abstract: In this article, we studied the role of oxygen in Pr${2}$CuO${4\pm\delta}$ thin films fabricated by polymer assisted deposition method. The magnetoresistance and Hall resistivity of Pr${2}$CuO${4\pm\delta}$ samples were systematically investigated. It is found that with decreasing the oxygen content, the low-temperature Hall coefficient ($R_H$) and magnetoresistance change from negative to positive, similar to those with the increase of Ce-doped concentration in R${2-x}$Ce${x}$CuO${4}$ (R= La, Nd, Pr, Sm, Eu). In addition, $T_c$ versus $R_H$ for both Pr${1-x}$LaCe${x}$CuO${4}$ and Pr${2}$CuO${4\pm\delta}$ samples can coincide with each other. We conclude that the doped electrons induced by the oxygen removal are responsible for the superconductivity of $T^\prime$-phase parent compounds.