Phase-sensitive Evidence for d-wave Pairing Symmetry in Electron-doped Cuprate Superconductors

Details Phase-sensitive Evidence for d-wave Pairing Symmetry in Electron-doped Cuprate Superconductors Phase-sensitive Evidence for d-wave Pairing Symmetry in Electron-doped Cuprate Superconductors

2000-02-22

arxiv.org/abs/cond-mat/0002341v2

Physics

Condensed Matter

Superconductivity

4 pages, Latex, 4 figures

Scientific paper

10.1103/PhysRevLett.85.182

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 d(x2-y2) order parameter. Samples with two other configurations, designed to b unfrustrated for a d-wave superconductor, do not show the half-flux quantum effect.

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