Microwave Electrodynamics of the Electron-Doped Cuprate Superconductors Pr(2-x)Ce(x)CuO(4-y) and Nd(2-x)Ce(x)CuO(4-y)
J. David Kokales, Patrick Fournier, Lucia V. Mercaldo, Vladimir V. Talanov, Richard L. Greene, Steven M. Anlage
Abstract
The pairing state symmetry of the electron-doped cuprate superconductors is thought to be s-wave in nature, in contrast with their hole-doped counterparts which exhibit a d-wave symmetry. We re-examine this issue based on recent improvements in our electron-doped materials and our measurement techniques. We report microwave cavity perturbation measurements of the temperature dependence of the penetration depth of Pr(2-x)Ce(x)CuO(4-y) and Nd(2-x)Ce(x)CuO(4-y) crystals. Our data strongly suggest that the pairing symmetry in these materials is not s-wave.
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