Abstract
The first observations of NMR and NQR of both isotopes135Ba and134Ba in isotopically enriched samples of YBa2Cu3Oy with oxygen concentrations y=6.0, 6.2, and 7.0 are described. The pure NQR frequencies and asymmetry parameter are in good agreement with theoretical predictions. The temperature dependence of the NQR frequency of Ba for y=7 is qualitatively similar to that for Cu(2) but much stronger. The temperature dependence of the longitudinal and transverse relaxation times opens new questions.
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Yakubowskii, A., Egorov, A. & Lütgemeier, H. Ba nuclear resonance in YBa2Cu2Oy . Appl. Magn. Reson. 3, 665–676 (1992). https://doi.org/10.1007/BF03166288
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DOI: https://doi.org/10.1007/BF03166288