Crystal growth and superconductivity of (La1−xCax)2CaCu2O6+δ

The effects of growth conditions and composition on the crystal growth of (La1−xCax)2CaCu2O6+δ (x=0.05–0.15) superconducting materials have been studied by using the floating zone method. A smooth solid-liquid growth interface of (La1−xCax)2CaCu2O6+δ (x=0.05–0.06) tended to break down into a cellular interface when the growth velocity was higher than 0.5mm/h. When the solid–liquid interface became cellular, the single crystal size in an …