Top-Seeded Melt-Growth of YBa2Cus3Ox Crystals for Neutron Diffraction Studies |
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Authors: | D C Peets R Liang C Stock W J L Buyers Z Tun L Taillefer R J Birgeneau D A Bonn and W N Hardy |
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Affiliation: | (1) Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada;(2) Canadian Institute for Advanced Research, Canada;(3) Physics Department, University of Toronto, Toronto, Ontario, Canada;(4) National Research Council, Chalk River, Ontario, Canada |
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Abstract: | We have grown cubic centimeter-size crystals of YBa2Cu3O
x
suitable for neutron studies, by a top-seeded melt-growth technique. Growth conditions were optimized with an eye toward maximizing phase purity. It was found that the addition of 2% Y2BaCuO5 and 0.5% Pt (by mass) were required to prevent melt loss and to obtain the highest crystallinity. A neutron diffraction study on a mosaic of six such crystals found that the final Y2BaCuO5 concentration was 5%, while other impurity phases comprised less than 1% by volume. The oxygen content was set to x = 6.5, the crystals were detwinned, and then carefully annealed to give the well-ordered ortho-II phase. The neutron study determined that 70% of the mosaic's volume was in the majority orthorhomic domain. The neutron (006) and (110) rocking curve widths were 1° per crystal and 2.2° for the mosaic, and the oxygen chain correlation lengths were >100 Å in the a- and b-directions and 50 Å in the c-direction. |
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Keywords: | crystal growth top-seeded melt-growth ortho-II YBCO neutron scattering |
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