Tunable superconductivity in parent cuprate Pr${}_2$CuO${}_{4\pm \hat{I}´}$ thin films

Abstract

In this article, we studied the role of oxygen in Pr${}_2$CuO${}_{4\pm \hat{I}´}$ thin films fabricated by polymer assisted deposition method. The magnetoresistance and Hall resistivity of Pr${}_2$CuO${}_{4\pm \hat{I}´}$ 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${}_{4\pm \hat{I}´}$ 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.

5 pages, 5 figures. Related publication: Phys.Rev.B 96,104518(2017)