1H-NMR in YBa2Cu3O7−δHx
We report on 1H NMR experiments on protonated samples of YBa2Cu3O7−δ . Our spectra show a seperation of the sample into an antiferromagnetic (afm) phase with high 1H-concentration and a metallic resp. superconducting (sc) phase with a low 1H-concentration. Cooling experiments suggest that the phase separation already takes place during the protonation process. Investigation of 1H-NMR signals in our unprotonated samples show a high proton background (about 0.25 1H’s per unit cell) already present in the as-received starting materials (commercially available). Comparison of the linewidth of the afm spectra with model calculations lead us to the conclusion that the protons in the afm phase are located within 1.5 Å above or below the Cu-chain layer.
KeywordsVortex Anisotropy Torque
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