Blumberg G, Koitzsch A, Gozar A, Dennis B S, Kendziora C A, Fournier P, Greene R L
Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
Phys Rev Lett. 2002 Mar 11;88(10):107002. doi: 10.1103/PhysRevLett.88.107002. Epub 2002 Feb 26.
Low energy polarized electronic Raman scattering of the electron-doped superconductor Nd2-x Ce x CuO4 ( x = 0.15, T(c) = 22 K) has revealed a nonmonotonic d(x(2)-y(2)) superconducting order parameter. It has a maximum gap of 4.4k(B)T(c) at Fermi surface intersections with an antiferromagnetic Brillouin zone (the "hot spots") and a smaller gap of 3.3k(B)T(c) at fermionic Brillouin zone boundaries. The gap enhancement in the vicinity of the hot spots emphasizes the role of antiferromagnetic fluctuations and the similarity in the origin of superconductivity for electron- and hole-doped cuprates.
电子掺杂超导体Nd2-x Ce x CuO4（x = 0.15，T(c) = 22 K）的低能极化电子拉曼散射揭示了非单调的d(x(2)-y(2))超导序参量。在费米面与反铁磁布里渊区的交点（“热点”）处，它具有4.4k(B)T(c)的最大能隙，而在费米子布里渊区边界处能隙较小，为3.3k(B)T(c)。热点附近能隙的增强突出了反铁磁涨落的作用以及电子掺杂和空穴掺杂铜酸盐超导起源的相似性。
