Dirty Superconductivity in the Electron-Doped Cuprate PCCO: a Tunneling Study

TL;DR

This study investigates the superconducting properties of electron-doped cuprate PCCO through tunneling measurements, revealing it as a weak coupling, dirty superconductor with a nonmonotonic d-wave order parameter consistent with BCS theory.

Contribution

It provides the first comprehensive tunneling analysis of PCCO across doping levels, confirming its BCS-like behavior and nonmonotonic d-wave symmetry.

Findings

PCCO exhibits BCS-like temperature dependence of the superconducting gap.

The order parameter is nonmonotonic d-wave across all doping levels.

PCCO is characterized as a weak coupling, dirty superconductor.

Abstract

We report a tunneling study between Pr_2-xCe_xCuO_{4-delta} (PCCO) and Lead as a function of doping, temperature and magnetic field. The temperature dependence of the gap follows the BCS prediction. Our data fits a nonmonotonic d-wave order parameter for the whole doping range studied. From our data we are able to conclude that the electron-doped cuprate PCCO is a weak coupling, BCS, dirty superconductor.