Phase-Sensitive Evidence for d-Wave Pairing Symmetry in Electron-Doped Cuprate Superconductors
C. C. Tsuei, J. R. Kirtley
DOI 10.1103/PhysRevLett.85.182 · Physical Review Letters
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Abstract
We present phase-sensitive evidence that the electron-doped cuprates Nd1.85Ce0.15CuO4−y (NCCO) and Pr1.85Ce0.15CuO4−y (PCCO) have d-wave pairing symmetry. This evidence was obtained by observing the half-flux quantum effect, using a scanning SQUID microscope, in c-axis-oriented films of NCCO or PCCO epitaxially grown on tricrystal [100] SrTiO3 substrates designed to be frustrated for a dx2−y2 order parameter. Samples with two other configurations, designed to be unfrustrated for a d-wave superconductor, do not show the half-flux quantum effect.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23.5 | Pressure unresolved | midpoint |
| Pr1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.5 | Pressure unresolved | midpoint |
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