Nickel Impurity-Induced Enhancement of the Pseudogap of Cuprate High-Tc Superconductors
A. V. Pimenov, A. V. Boris, Li Yu, V. Hinkov, Th. Wolf, J. L. Tallon, B. Keimer, C. Bernhard
DOI 10.1103/PhysRevLett.94.227003 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The influence of magnetic Ni and nonmagnetic Zn impurities on the normal-state pseudogap (PG) in the c-axis optical conductivity of (Sm,Nd)Ba2{Cu1−y(Ni,Zn)y}3O7−δ 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 nonmagnetic impurities instead points towards an important role of magnetic correlations in the PG state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdBa2(Cu1-yNiy)3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | midpoint |
| NdBa2(Cu1-yNiy)3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | midpoint |
| (Nd,Sm)Ba2(Cu1-yZny)3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | midpoint |
Similar papers
Exact diagonalization study of the effects of Zn and Ni impurities on the pseudogap of underdoped cuprate high-Tc superconductors
similarity 0.95Jiří Vašátko & Dominik Munzar
Source status unknown — claims are unverified
Ni impurity induced enhancement of the pseudogap in cuprate high T_c superconductors
similarity 0.94A. V. Pimenov et al. · 2004 · arXiv:cond-mat/0412250
Source status unknown — claims are unverified
Pseudogap term in the magnetic response of cuprate superconductors
similarity 0.93R. E. Walstedt et al.
Source status unknown — claims are unverified
Correlations between magnetic and superconducting properties of Zn-substituted YBa2Cu3O6+x
similarity 0.93H. Alloul et al.
Source status unknown — claims are unverified
High-field studies of superconducting fluctuations in high-Tc cuprates: Evidence for a small gap distinct from the large pseudogap
similarity 0.92F. Rullier-Albenque et al.
Source status unknown — claims are unverified
Pseudogap temperature T* of cuprate superconductors from the Nernst effect
similarity 0.92O. Cyr-Choinière et al.
Source status unknown — claims are unverified