Location of fluorine atoms and mechanism of improving superconducting properties with F-doped in YBaCuO series

来源期刊：中国有色金属学报(英文版)2000年第2期

论文作者：邓辉球 高孝恢 王小刚 赵立华

文章页码：176 - 182

Key words：superconductor; YBaCuO; F-doped

Abstract: A series of YBa₂Cu₃O_6.5-0.5x+δF_x(x=0, 0.3, 0.6, 1.0, 1.5, 2.0) samples were synthesized using state reaction method. The superconducting properties and microstructures of the samples were studied with AC susceptibility, DC resistivity, fluorine and oxygen content measurements, XRD, IR and XPS techniques. The results show that F-doping increases theTCand decreases the transition width, and fluorine atoms have entered into the superconducting phase and substituted for the oxygen atoms at O(4) sites. The mechanism of improving superconducting properties is that fluorine-doping adjusts the hole carrier concentration in the Cu-O planes.