Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.31: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Effect of Zn and Ni impurities on the quasiparticle renormalization in Bi-2212 — •V. B Zabolotnyy¹, S. V. Borisenko¹, A. A. Kordyuk^1,2, J. Fink¹, J. Geck¹, A. Koitzsch¹, M. Knupfer¹, B. Büchner¹, H. Berger³, A. Erb⁴, C. T. Lin⁵, and B. Keimer⁵ — ¹Institute for Solid State Research, IFW-Dresden, Germany — ²Institute of Metal Physics of National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine — ³Institute of Physics of Complex Matter, EPFL, CH-1015 Lausanne, Switzerland — ⁴Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften,Walther-Meißner Strasse 8, 85748 Garching, Germany — ⁵Max-Planck Institut für Festkörperforschung, D-70569 Stuttgart, Germany

The Cu substitution by Zn and Ni impurities and its influence on the mass renormalization effects in angle resolved photoelectron spectra (ARPES) of Bi₂Sr₂CaCu₂O_8−δ is addressed. We show that the nonmagnetic Zn atoms have much stronger effect both in nodal and antinodal parts of the Brillouin zone than magnetic Ni. The observed changes are consistent with the behaviour of the spin resonance mode as seen by inelastic neutron scattering in YBCO. This strongly suggests that the “peak-dip-hump” and the “kink" in ARPES on the one side and neutron resonance on the other are closely related features.