Doping effect on the evolution of the pairing symmetry in n-type superconductor near antiferromagnetic phase boundary

TL;DR

This study investigates how doping-induced disorder affects the pairing symmetry in electron-doped cuprate superconductors near the antiferromagnetic phase boundary, revealing potential mixed pairing states.

Contribution

It provides experimental evidence of disorder's differential impact on pairing symmetry in electron-doped cuprates, suggesting a complex (s+id)-pairing state near the phase boundary.

Findings

Optimally doped compound shows decreasing Tc and Hc2 slope with disorder.

Underdoped compound's Tc remains constant while Hc2 slope increases with disorder.

Results imply a possible mixed (s+id)-pairing state near the phase boundary.

Abstract

We present the investigation results of the in-plane \{rho}(T) resistivity tensor at the temperature range 0.4-40 K in magnetic fields up to 90kOe (H||c, J||ab) for electron-doped Nd{2-x}Ce{x}CuO{4+{\delta}} with different degree of disorder near antiferromagnetic - superconducting phase boundary. We have experimentally found that for optimally doped compound both the upper critical field slope and the critical temperature decrease with increasing of the disorder parameter (d-wave pairing) while in the case of the underdoped system the critical temperature remains constant and (dHc2/dT)|Tc increases with increasing of the disorder (s-wave pairing). These features suggest a possible implementation of the complex mixture state as the (s+id)-pairing.