Effect of disorder on the pairing properties of electron-doped high-Tc superconductors

Abstract

The effect of disorder on pairing properties in the mixed dx2−y2+is- and dx2−y2+idxy-wave pairing states in electron-doped high-Tc cuprates is investigated by self-consistently solving the Bogoliubov–de Gennes equations. It is found that the dominant dx2−y2-wave component will give way to the s-wave component, while the dxy-wave component will have the same magnitude as the dx2−y2-wave component with the increase of disorder strength. In real space, the dxy-wave component competes locally with the dx2−y2-wave component, while the s-wave component does not seem to show such competition with the latter. Both transitions from the dx2−y2-wave pairing to the mixed dx2−y2+is-wave pairing and to the mixed dx2−y2+idxy-wave pairing can result in the absence of zero-bias peaks in the local tunneling spectra, but it has a U-shaped form for the former and a V-shaped form for the latter. These results may serve to probe the pairing symmetry in the electron-doped cuprates.

Source-reported materials — not catalogue approval

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