Cu NMR Study of Detwinned Single Crystals of Ortho--II YBCO6.5

Details Cu NMR Study of Detwinned Single Crystals of Ortho--II YBCO6.5 Cu NMR Study of Detwinned Single Crystals of Ortho--II YBCO6.5

2003-10-10

arxiv.org/abs/cond-mat/0310255v1

Physica C 405 (2004) 227-239

Physics

Condensed Matter

Superconductivity

11 pages, 7 figures, submitted to Physica C

Scientific paper

10.1016/j.physc.2004.02.010

Copper NMR has been used as a local probe of the oxygen ordering in Ortho--II YBa2Cu3O6.5 crystals grown in BaZrO3 crucibles. Line assignments have been made to each of the expected crystallographically inequivalent sites. The presence of distinct and narrow lines for these sites as well as the lack of a line known to be associated with oxygen defects indicates that these crystals are highly stoichiometric. Our estimate of the lower limit on the chain length is consistent with that derived from X-ray diffraction measurements. In addition, we have found no evidence for static magnetic moments, in contrast to some previous results.

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