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Preparation and Characterization of Homogeneous YBCO Single Crystals with Doping Level near the SC-AFM Boundary

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arxiv cond-mat/0111379 v1 pith:7WVATIG6 submitted 2001-11-20 cond-mat.supr-con cond-mat.mtrl-sci

Ruixing Liang , D. A. Bonn , W. N. Hardy , Janice C. Wynn , K. A. Moler , L. Lu , S. Larochelle , L. Zhou
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M. Greven L. Lurio S. G. J. Mochrie
This is my paper · ORCID
classification cond-mat.supr-concond-mat.mtrl-sci
keywords crystalsoxygencontentdopingnearboundaryhomogeneouslevel
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High-purity and homogeneous YBa2Cu3Oy single crystals with carrier doping level near the AFM-SC boundary have been obtained in the oxygen content range between y = 6.340 and 6.370. The crystals are ortho-II phase at room temperature and undergo the orthorhombic to tetragonal transition at about 140_Degree_C. They show sharp superconducting transitions, with Tc between 4 and 20 K. Tc changes by 0.8 K when the oxygen content y is changed by 0.001, and is also sensitive to annealing conditions near room temperature, due to the dependence of doping on oxygen ordering correlation lengths. Crystals with oxygen content y lower than 6.345 are non-superconducting.

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