Robust dx2−y2 Pairing Symmetry in Hole-Doped Cuprate Superconductors
C. C. Tsuei, J. R. Kirtley, G. Hammerl, J. Mannhart, H. Raffy, Z. Z. Li
DOI 10.1103/PhysRevLett.93.187004 · Physical Review Letters
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Abstract
Although initially quite controversial, it is now widely accepted that the Cooper pairs in optimally doped cuprate superconductors have predominantly dx2−y2 wave function symmetry, and the controversy has now shifted to whether the pairing symmetry changes away from optimal doping. Here we present phase-sensitive tricrystal experiments on three cuprate systems: Y0.7Ca0.3Ba2Cu3O7−δ (Ca-doped Y-123), La2−xSrxCuO4 (La-214), and Bi2Sr2CaCu2O8+δ (Bi-2212), with doping levels covering the underdoped, optimal, and overdoped regions. Our work implies that predominantly dx2−y2 pairing symmetry is robust over a large variation in doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.5 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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