Nonmonotonic dx2-y2 Superconducting Order Parameter in Nd2-xCexCuO4
G. Blumberg, A. Koitzsch, A. Gozar, B. S. Dennis, C. A. Kendziora, P. Fournier, R. L. Greene
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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