Cu 63 -NMR study of oxygen disorder in ortho-II YBa 2 Cu 3 O y

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

Keywords:

• Nuclear magnetic resonance
• Oxygen
• Condensed matter physics
• NMR spectra database
• Physics
• Spectral line
• Coherence (physics)
• systematic deviation
• Reproducibility

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