Effect of Zn and Ni impurities on the quasiparticle renormalization in Bi-2212
V. B. Zabolotnyy, S. V. Borisenko, A. A. Kordyuk, J. Fink, J. Geck, A., Koitzsch, M. Knupfer, B. Buechner, H. Berger, A. Erb, C. T. Lin, B. Keimer,, R. Follath
TL;DR
This study investigates how nonmagnetic Zn and magnetic Ni impurities affect quasiparticle mass renormalization in Bi-2212, revealing that Zn has a stronger impact and linking ARPES features to neutron resonance modes.
Contribution
It demonstrates the differential effects of Zn and Ni impurities on ARPES spectra and connects these effects to neutron scattering observations, advancing understanding of impurity influence in high-Tc superconductors.
Findings
Zn impurities cause stronger changes in ARPES than Ni.
The impurity effects are consistent with neutron scattering data.
Impurities influence the peak-dip-hump and kink features in spectra.
Abstract
The Cu substitution by Zn and Ni impurities and its influence on the mass renormalization effects in angle resolved photoelectron spectra (ARPES) of Bi-2212 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.
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