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Melt growth and superconducting properties of Sm-doped YBCO super-conductor by zone melting method  

김소정 (동해대학교 전기전자공학과)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.14, no.2, 2004 , pp. 68-72 More about this Journal
Abstract
Sm-doped YBCO high $T_c$ superconductor was directionally grown by zone melt growth process in air atmosphere. Cylindrical green rods of $(Sm/Y)_{1.8}Ba_{2.4}Cu_{3.4}O_{7-x}$[(Sm/Y)1.8] oxides were fabricated by cold isostatic pressing (CIP) method using rubber mold. Based on the variation of melting temperature and growth rate, the microstructure and superconducting properties were systematically measured by using optical micrographs, TEM and SQUID magnetometer. In this study optimum melting temperature and growth rate were $1085^{\circ}C$ and 3.5 mm/hr respectively. Nonsuperconducting $(Sm/Y)_2BaCuO_5$ inclusions of (Sm/Y)1.8 superconductor were uniformly distributed within the superconducting (Sm/Y) $Ba_2Cu_3O^{7-x}$ matrix. The directionally melt-textured (Sm/Y)1.8 superconductor showed an onset $T_c$ $\geq$ 90K and sharp superconducting transition.
Keywords
$(Sm/Y)_{1.8}Ba_{2.4}Cu_{3.4}O_{7-x}$; Zone melt growth; $(Sm/Y)Ba_2Cu_3O_x; (Sm/Y)_2BaCuO_5$;
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