Cu-NMR study of oxygen disorder in ortho-II YBa2Cu3Oy

Abstract

We show that 63Cu NMR spectra place strong constraints on both the nature and the concentration of oxygen defects in ortho-II YBa2Cu3Oy. Systematic deviation from ideal ortho-II order is revealed by the presence of inequivalent Cu sites in either full or empty chains. The results can be explained by two kinds of defects: oxygen clustering into additional chains, or fragments thereof, most likely present at all concentrations (6.4<y<6.6) and oxygen vacancies randomly distributed in the full chains for y<6.50 only. Furthermore, the remarkable reproducibility of the spectra in different samples with optimal ortho-II order (y=6.55) shows that chain-oxygen disorder, known to limit electronic coherence, is ineluctable because it is inherent to these compounds.

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• Coupling between dynamic magnetic and charge-order correlations in the cuprate superconductor Nd${}_{2-x}$Ce${}_x$CuO${}_4$
• Locally commensurate charge-density wave with three-unit-cell periodicity in YBCO
• Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field
• Vortex phase diagram and the normal state of cuprates with charge and spin orders
• NMR study of charge density waves under hydrostatic pressure in YBa2Cu3Oy
• Observation of electronic bound states in charge-ordered YBa${}_2$Cu${}_3$O${}_y$
• Signatures of two gaps in the spin susceptibility of a cuprate superconductor
• Microscopic evidence for the intra-unit-cell electronic nematicity inside the pseudogap phase in YBa${}_2$Cu${}_4$O${}_8$
• Robust Charge-Density Wave Correlations in Optimally-Doped YBa2Cu3Oy
• Impurity induced phase competition and supersolidity