Abstract
A technology was elaborated to produce large superconducting crystals by use of a non-crucible floating zone melting method with light radiation heating under oxygen atmosphere. Large superconducting single crystals La 2− x Sr x CuO 4 and Nd 2− x Ce x CuO 4 ( x = 0.15) were obtained with diameters and lengths up to 7 mm and 30 mm respectively, and masses exceeding 5 g. Temperatures of the superconducting transition for La- and Nd-based crystals were T c = 39 and 25 K respectively, and the transition width was of the order of 1 K. Superconducting properties were studied by measuring resistance, AC-magnetic susceptibility and specific heat in magnetic fieldsi0 to 8 T. In the temeprature dependence of the specific heat was we observed the jumps corresponding to the superconducting transition. The content of the superconducting phase in the samples is estimated to be about 80–90%.
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