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

Ruixing Liang·D. A. Bonn·W. N. Hardy·Janice C. Wynn·K. A. Moler·L. Lu·S. Larochelle·L. Zhou·M. Greven·L. Lurio·S. G. J. Mochrie
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Abstract

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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Ruixing Liang, D. A. Bonn, W. N. Hardy, Janice C. Wynn, K. A. Moler, L. Lu, S. Larochelle, L. Zhou, M. Greven, L. Lurio, S. G. J. Mochrie. 2001-11-20. Preparation and Characterization of Homogeneous YBCO Single Crystals with Doping Level near the SC-AFM Boundary. https://doi.org/10.1016/s0921-4534(02)01269-8

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