Abstract
We report on 1H-NMR experiments on protonated samples of YBa 2Cu 3O 7 − δ. Phase separation into an antiferromagnetic (AFM) phase with high 1H-concentration and a metallic/superconducting (SC) phase with a low 1H-concentration is observed. Cooling experiments suggest that this phase separation takes place already during the protonation process. Even unprotonated samples show high proton background 1H-NMR signals (about 0.25 1Hs per unit cell). Comparison of the linewidth of the AFM spectra with model calculations leads us to the conclusion that the protons in the AFM phase are located within 1.2 Å above or below the Cu-chain layer.
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