Abstract
We have studied the growth of Zn doped YBa 2Cu 3O 7−δ (YBCO:Zn) crystals as a function of the starting mixture composition. The maximum Zn concentration in YBCO:Zn crystals, determined by EDAX, is x=0.13 (x=3× Zn/( Zn+ Cu)) obtained with a startingmixture of Y 2O 3, BaO, CuO and ZnO in 1.55:43.18:48.75:6.52 wt. ratio. For higher ZnO concentration there is no growth of YBCO crystals, but only Zn 1−yCu yO (y<0.02). All the YBCO:Zn crystals have orthorhombic structure, although we observe a decrease of the orthorhombicity for x>0.08. YBCO:Zn crystals with the highest Zn content have T c =21K, ΔT c =3K, ϱ(300 K)=440μΩcm and the Hall coefficient is R H(100K)=2.2×10 −9m 3/C, i.e. twice what observed in pure YBCO. The decrease of orthorhombicity and the high value of Hall coefficient are not observed in the corresponding ceramics and they may be due to different preferential site occupancy of Zn in crystals respect to ceramics.
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