Temperature dependence of tunneling conductance on an overdoped Pr0.82LaCe0.18CuO4 with Tc∼16K

We present tunneling conductances on electron-doped Pr0.82LaCe0.18CuO4 (PLCCO) single crystals with Tc∼16K that are in overdoped regime. Our data exhibit reproducible superconducting-gap peaks at 4.44±0.71mV and the subgap-shape is cusplike which can be fitted well by using d-wave or nonmonotonic d-wave symmetry, showing that PLCCO is a superconductor with nodal gap. Furthermore, we found that the temperature dependence of the gap magnitude is BCS like and it disappeared at Tc. We conclude that these characteristic features (such as d-wave order parameter and no pseudogap above Tc) of electron-doped cuprates in the overdoped regime are fundamentally similar to those of hole-doped cuprates in the overdoped regime.