Single-Crystal Growth of Bi-Sr-Ca-Cu Oxides and Its Superconductivity
Single crystals of Bi-Sr-Ca-Cu Oxide were grown by the self-flux method. Relation between the single crystals produced and the starting compositions in the Bi-Sr-Ca-Cu Oxide system was obtained for Bi2 (Sr,Ca)2CuOy, Bi2 (Sr,Ca)3-x Cu2Oy and (Sr,Ca)BiO3, The dimensions of the single crystal of the superconductor obtained were up to 7X5X1mm3.
The effect of cation deficiency of Bi2 (Sr,Ca)3-x Cu2Oy on its superconductivity have been studied. This system forms a solid solution within the x range of 0.2 to 0.3. The lattice parameter of the c axis decreases with the increase of x. The strong sattelite peak in the X-ray diffraction patterns originating from the incommensurate modulated structure are observed for the samples with large cation deficiency.
The critical temperature of the single crystal was 84K which was determined by both magnetization and electrical resistivity measurements. The resistivity ratio in the c plane and along the c axis for Bi2(Sr,Ca)3-x Cu2Oy was found to be approximately 35 at Tc onset.
KeywordsElectrical Resistivity Measurement Alkaline Earth Element Resistivity Ratio Zero Resistance Cation Deficiency
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