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Regensburg 2002 – scientific programme

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TT: Tiefe Temperaturen

TT 6: Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter I

TT 6.4: Talk

Monday, March 11, 2002, 16:45–17:00, H19

Nonmonotonic dx2y2 Superconducting Order Parameter in Nd2−xCexCuO4 — •Andreas Koitzsch1,2, G. Blumberg2, A. Gozar2, B.S. Dennis2, C.A. Kendziora3, P. Fournier4, and R.L. Greene41Institute for Solid State and Materials Research Dresden, P.O.Box 270016, D-01171 Dresden, Germany — 2Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 — 3United States Naval Research Laboratory, Code 6333, Washington, D.C. 20375 — 4Center for Superconductivity Research an Department of Physics, University of Maryland, Collage Park, MD 20742

Electronic Raman scattering of the electron doped superconductor Nd2−xCexCuO4 (x=0.15, Tc=22 K) has revealed a nonmonotonic dx2y2 superconducting order parameter. It has a maximum gap of 4.4 kBTc at the Fermi surface intersection with the antiferromagnetic Brioullin zone (the No-dqhot spotsNo-dq) and a smaller gap of 3.3kBTc at the Brioullin zone boundary. The gap enhancement in the viccinity of the hot spots emphasizes the role of antiferromagnetic fluctuations for the origin of superconductivity in the cuprates.

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