Journal
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
Volume 23, Issue 5, Pages 591-596Publisher
SPRINGER
DOI: 10.1007/s10948-010-0761-5
Keywords
Bi2Sr2-xLaxCuO6+delta; Crystal growth; Thermal behavior; Structure; Superconductivity
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High-quality and various doped Bi2Sr2-xLaxCu Omicron(6+delta) (x = 0-0.90) single crystals were obtained by floating-zone method. Analysis of the thermal behavior indicated an incongruent melt for all the doped compounds. The segregation coefficient of La related to Sr was estimated to be similar to 1.02. Chemical compositions including the La doping in the crystals were accurately determined to study the effect of doping on the structural, chemical and superconducting property of the compounds. Raman spectra were performed to show the high-frequency modes 627 cm(-1) softened with increasing the doping level of La. Implications of the doping effect on crystals for understanding the superconductivity are discussed.
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