Ni impurity induced enhancement of the pseudogap in cuprate high T_c superconductors

Abstract

The influence of magnetic Ni and non-magnetic Zn impurities on the normal state pseudogap (PG) in the c-axis optical conductivity of NdBa${}_2$\{Cu(Ni,Zn)${}_y{\}}_3$O${}_{7-\delta }$ crystals was studied by spectral ellipsometry. We find that these impurities which strongly suppress superconductivity have a profoundly different impact on the PG. Zn gives rise to a gradual and inhomogeneous PG suppression while Ni strongly enhances the PG. Our results challenge theories that relate the PG either to precursor superconductivity or to other phases with exotic order parameters, such as flux phase or d-density wave states, that should be suppressed by potential scattering. The apparent difference between magnetic and non-magnetic impurities instead points towards an important role of magnetic correlations in the PG state.

11 pages and 2 figures

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• Spectroscopic distinction between the normal state pseudogap and the superconducting gap of cuprate high T_{c} superconductors
• A spin-freezing perspective on cuprates
• Locating the pseudogap closing point in cuprate superconductors: absence of entrant or reentrant behavior
• Pairing Gaps, Pseudogaps, and Phase Diagrams for Cuprate Superconductors
• Gossamer Superconductivity, New Paradigm?
• Magnetotransport in d-wave density waves
• Nanoscale phase separation and pseudogap in the hole-doped cuprates from fluctuating Cu-O-Cu bonds
• Impurity scattering in unconventional density waves: non-crossing approximation for arbitrary scattering rate
• Nernst Effect in NdBa_2[Cu_{1-y}Ni_y]_3O_{7-δ}
• Bottom-up approach to high-temperature superconductivity
• Pseudogap enhancement due to magnetic impurities in d-density waves
• Structural, electrical, magnetic, and flux pinning properties of YBCO/Ni superconducting composites: analyses and possible explanations
• Dynamic correlated Cu(2) magnetic moments in superconducting YBa_2(Cu_0.96Ni_0.04)_3O_y (y ~ 7)