Abstract
Crystal growth of Ca-doped PrBa 2 Cu 3 O 7-δ (Pr-123) single crystals by slow cooling of Pr 3 O 11 -CaCO 3 -BaCO 3 -CuO melts (self-flux technique) in ambient air atmosphere was studied. As the first approach the growth of Ca-free crystals in Al 2 O 3 and ZrO 2 crucibles was investigated. The best quality crystals with the average size of 5 x 5 x 0.2mm 3 were obtained from Al 2 O 3 crucibles for Ba/Cu = 0.41 and 15 wt.% (2.41 mol.%) of stoichiometric Pr-123 solute in the melt. Next, using CaCO 3 as calcium source (0.09 -12.68 wt.%), the good quality Pr 1-x Ca x Ba 2 Cu 3 O 7-δ crystals with 0 ≤ x ≤ 0.26 were grown in the Al 2 O 3 crucibles from the solution with fixed value of Ba/Cu = 0.41. The oxygenated single crystals with size up to 5 x 8 x 0.2 mm 3 were used for electric transport investigations from four-probe resistivity measurements. The temperature dependence of resistivity of Ca-doped Pr-123 crystals is typical for systems with locallized states and, in principle, follows the Mott law for variable-range hopping (VRH).
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