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TT: Fachverband Tiefe Temperaturen
TT 29: Superconductivity - Mechanisms, Phase Diagram, Competing Order
TT 29.7: Talk
Thursday, March 29, 2007, 17:30–17:45, H18
63,65Cu Nuclear Quadrupole Resonance Study of Impurity doped NdBa2(Cu,Ni,Zn)3O6+y — •Hans-Joachim Grafe1, Franziska Hammerath1, Anastasia Vyalikh1, Grzegorz Urbanik1, Vladislav Kataev1, Thomas Wolf2, and Bernd Büchner1 — 1IFW Dresden, Institut für Festkörperforschung, Postfach 270116, 01171 Dresden, Germany — 2Forschungszentrum Karlsruhe, IFP, D-76021 Karlsruhe, Germany
We present 63,65Cu Nuclear Quadrupole Resonance (NQR) measurements on slightly underdoped NdBa2(Cu,Ni,Zn)3O6+y single crystals with 11.5 % magnetic (Ni) and 12 % non-magnetic (Zn) impurities. Superconductivity is completely suppressed in both samples. By fitting the spectra we can estimate the impurity content of the chains and the planes. At low temperatures the Ni induces a wipeout of the Cu NQR signal intensity comparable to that found in stripe ordered lanthanum cuprates. In contrast, the intensity of the Zn doped sample is not changed down to the lowest temperatures, and the spin lattice relaxation rate is suppressed. This difference enlightens the different effect of nonmagnetic (S = 0) and magnetic (S = 1) impurities on the spin dynamics in the CuO2 planes, and directly confirms current theoretical positions on this topic.