Relationship between growth, structure and superconductivity of single crystal YBa2Cu3O7-δ

Chen, C. ; Wondre, F. R. ; Hodby, J. W. ; Ryan, J. F. ; Narlikar, A. V. ; Samanta, S. B. (1999) Relationship between growth, structure and superconductivity of single crystal YBa2Cu3O7-δ Journal of Low Temperature Physics, 117 (3-4). pp. 711-715. ISSN 0022-2291

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Official URL: http://www.springerlink.com/content/q701j0n36208x5...

Related URL: http://dx.doi.org/10.1023/A:1022589010421

Abstract

We study the crystal growth of YBa2Cu3O7-δ with additives, using ac susceptibility, X-ray diffraction and STM. One specific additive, BaF2 , dramatically improves both the crystal growth and the superconducting properties. A cluster growth model is proposed to describe the function of the additive. F reduces the Al contamination of Cu-O chains, and the orthorhombicity increases. On a nanometer scale, the roughness of the chains decreases markedly. Superconductivity is further enhanced using non-contaminating crucibles. Large single crystals with TC = 93.7 K and ΔTC = 0.1K were grown in Y2O3 or BaZrO3 crucibles using the BaF2 additive.

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Deposited On:19 Mar 2011 06:34
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