STM Investigation of Bosonic Modes and a Superconducting Gap in the Electron Doped Cuprate Pr$_{1-x}$LaCe$_{x}$CuO$_{4}$

While continual effort in scanning tunneling microscopy (STM) remains focused on the hole-doped cuprates less attention has been given to the equally important electron-doped side of the phase diagram. ~We use a variable temperature UHV STM to investigate the electron-doped cuprate superconductor Pr$_{1-x}$LaCe$_{x}$CuO$_{4}$. ~We explore temperatures 2 K and higher and find a superconducting gap that disappears above Tc. ~We also find satellite features anti-correlated to the gap which we associate with bosonic modes. ~We relate our findings to neutron scattering results and discuss how this electron doped superconductor differs from more familiar hole-doped cuprates.