Abstract
Substitution of Pr for Ba in Pr 1 + x Ba 2 − x Cu 3O 7 − δ ( x = 0.06−0.29) single crystals was successfully controlled by the crystal pulling method. The substitution ratios x of the grown single crystals from an average composition in the melt of Pr : Ba: Cu = 5 : 30 : 65, Pr : Ba : Cu = 5 : 28 : 67 and Pr : Ba : Cu = 5 : 24 : 71 were x = 0.06, 0.14 and 0.29 respectively. These phenomena appear to depend on the local equilibrium tie-line of Pr 1 + x Ba 2 − x Cu 3 O 7 − δ liquid on the isothermal section of the PrO yBaOCuO ternary phase diagram at the growth temperature. The resistivity of these crystals shows the tendency to increase with decreasing temperature. However, the resistivity of the crystal with x = 0.06 is six orders of magnitude smaller than that of the x = 0.29 crystal at 70 K.
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