Nonmonotonic dx2-y2 Superconducting Order Parameter in Nd2-xCexCuO4
Abstract
Low energy polarized electronic Raman scattering of the electron doped superconductor Nd1.85Ce0.15CuO4 (Tc=22 K) has revealed a nonmonotonic dx2-y2 superconducting order parameter. It has a maximum gap of 4.4 kBTc at Fermi surface intersections with antiferromagnetic Brillouin zone (the ``hot spots'') and a smaller gap of 3.3 kBTc at fermionic Brillouin zone boundaries. The gap enhancement in the vicinity of the ``hot spots'' emphasizes role of antiferromagnetic fluctuations and similarity in the origin of superconductivity for electron- and hole-doped cuprates.
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