We present point contact tunneling conductances measured on single crystals of an electron-doped cuprate, Pr0.89LaCe0.11CuO 4 (PLCCO) with Tc∼26K, which is nearly optimally-doped regime. The tunneling conductances on PLCCO measured at 4.2K exhibit reproducible superconducting gap peaks at ∼6.09 0.47mV on the V-shaped background conductance, where the subgap-shape is cusplike, and the model with the nonmonotonic d-wave energy gap is in good agreement with the experimental tunneling conductance for PLCCO. Furthermore we observed a fine structure beyond the gap peak, which would reflect a bosonic mode for pairing, such like phonon for conventional superconductors.
ASJC Scopus subject areas
- Physics and Astronomy(all)