Evidence of Doping-Dependent Pairing Symmetry in Cuprate Superconductors

Details Evidence of Doping-Dependent Pairing Symmetry in Cuprate Superconductors Evidence of Doping-Dependent Pairing Symmetry in Cuprate Superconductors

2001-08-15

arxiv.org/abs/cond-mat/0108240v1

Phys. Rev. Lett. 87, 087003 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures. Published in Physical Review Letters. Corresponding author: Nai-Chang Yeh (e-mail address: ncyeh@caltech.e

Scientific paper

10.1103/PhysRevLett.87.087003

Scanning tunneling spectroscopy (STS) studies reveal long-range spatial homogeneity and predominantly $d_{x^2-y^2}$-pairing spectral characteristics in under- and optimally doped $\rm YBa_2Cu_3O_{7-\delta}$ superconductors, whereas STS on $\rm YBa_2(Cu_{0.9934}Zn_{0.0026}Mg_{0.004})_3O_{6.9}$ exhibits {\it microscopic} spatial modulations and strong scattering near the Zn or Mg impurity sites, together with global suppression of the pairing potential. In contrast, in overdoped $\rm (Y_{0.7}Ca_{0.3})Ba_2Cu_3O_{7-\delta}$, $(d_{x^2-y^2}+s)$-pairing symmetry is found, suggesting significant changes in the superconducting ground-state at a critical doping value.

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