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Abstract
We reanalyze specific heat data for optimally electron-dopedPr1.85Ce0.15CuO4 − y superconductors. The magnetic field dependence of the electronic specificheat in the vortex state does not support d-wave gap symmetry but agreesquantitatively with an s-wave theory. Furthermore, the field dependence at a finitetemperature almost coincides with that for a conventional s-wave superconductor,V i3Si. The present work provides bulk evidence for a nodeless s-wave gap symmetry in optimallyelectron-doped cuprates.
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