Electron-doped superconducting (La, Ce)₂CuO₄ thin films grown by dc magnetron sputtering and their transport properties

Electron-doped La_2-xCe_xCuO₄ (LCCO) thin films were successfully prepared on ( 100) SrTiO₃ substrates by the dc magnetron sputtering method. The optimal-doped films show a highly c-axis oriented single T-type structure, and the zero resistance temperature T _C0 is 25 K. In the normal state, the nearly quadratic temperature dependence of the resistivity was found and attributed to the Landau-Fermi liquid behaviour due to electron-electron scattering. At the same time, the negative sign of the Hall coefficient for such films well above T_C obviously confirms the electron-type nature. The optimal conditions for the growth of single-phase T'-type LCCO thin films are also discussed in detail.