Abstract
The anomalous magnetization characteristic, intra-grain granularity and the magnitude of the flux pinning in single crystals of YBa2Cu307–δ are shown to be intimately linked. As the nominal oxygen deficiency δ decreases towards zero, the flux pinning declines and the crystals lose their explicitly granular signature. As δ is seldom specifically controlled at levels below ˜0.05 in even the most carefully made materials, small oxygen deficiencies may contribute significantly to both the flux pinning and the weak-link properties.
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Daeumling, M., Seuntjens, J. & Larbalestier, D. Oxygen-defect flux pinning, anomalous magnetization and intra-grain granularity in YBa2Cu307–δ. Nature 346, 332–335 (1990). https://doi.org/10.1038/346332a0
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DOI: https://doi.org/10.1038/346332a0
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