Evidence of Doping-Dependent Pairing Symmetry in Cuprate Superconductors
N.-C. Yeh, C.-T. Chen, G. Hammerl, J. Mannhart, A. Schmehl, C. W. Schneider, R. R. Schulz, S. Tajima, K. Yoshida, D. Garrigus, M. Strasik
DOI 10.1103/PhysRevLett.87.087003 · Physical Review Letters
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Abstract
Scanning tunneling spectroscopy studies reveal long-range spatial homogeneity and predominantly dx2−y2-pairing spectral characteristics in under- and optimally doped YBa2Cu3O7−δ superconductors, whereas STS on YBa2(Cu0.9934Zn0.0026Mg0.004)3O6.9 exhibits 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 (Y0.7Ca0.3)Ba2Cu3O7−δ, (dx2−y2+s)-pairing symmetry is found, suggesting significant changes in the superconducting ground state at a critical doping value.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.9 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
| (Y0.7Ca0.3)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure not reported | unknown |
| YBa2(Cu0.9934Zn0.0026Mg0.004)3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure not reported | unknown |
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