Nonmonotonic d_{x^2-y^2} Superconducting Order Parameter in Nd_{2-x}Ce_xCuO_4

A. Gozar; A. Koitzsch; B.S. Dennis; C.A. Kendziora; G. Blumberg; P. Fournier; R.L. Greene

arxiv: cond-mat/0201538 · v1 · submitted 2002-01-29 · ❄️ cond-mat.supr-con · cond-mat.str-el

Nonmonotonic d_(x²-y²) Superconducting Order Parameter in Nd_(2-x)Ce_xCuO₄

G. Blumberg , A. Koitzsch , A. Gozar , B.S. Dennis , C.A. Kendziora , P. Fournier , R.L. Greene This is my paper

classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords antiferromagneticbrillouinnonmonotonicorderparameterspotssuperconductingzone

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Low energy polarized electronic Raman scattering of the electron doped superconductor Nd_1.85Ce_0.15CuO_4 (T_c=22 K) has revealed a nonmonotonic d_{x^2-y^2} superconducting order parameter. It has a maximum gap of 4.4 k_BT_c at Fermi surface intersections with antiferromagnetic Brillouin zone (the ``hot spots'') and a smaller gap of 3.3 k_BT_c 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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Nonmonotonic d_(x²-y²) Superconducting Order Parameter in Nd_(2-x)Ce_xCuO₄

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