对Bi-2212超导体中的Raman谱指认

本文对Ｂｉ２－ｘＰｂｘＳｒ２ＣａＣｕ２Ｑδ（ｘ＝０￣０．５）系列样吕以及在真空下不同温度退火的Ｂｉ１．６Ｐｂ０．４Ｓｒ２ＣａＣＵ２Ｏδ样品进行了Ｘ射线衍射和Ｒａｍａｎ谱实验研究。测量表明，随着退火温度的升高，ａ，ｂ，ｃ轴晶格常数增加，与Ｏ（１）ＣｕＢｇ模式相关的２９４ｃｍ＾－１的峰强减少，峰位红移。研究结果进一步表明，４６４ｃｍ＾－１和６３０ｃｍ＾－１峰分别与Ｏ（３）ＢｉＡ１ｇ和Ｏ（２）ＳｒＡ１ｇ

RAMAN SCATTERING SPECTRA ASSIGNMENT IN Bi-BASED 2212 SUPERCONDUCTOR

Investigation of the polycrystal samples of Bi2-xPbxSr2CaCu2Oδ(x=0～0.5) and annealed Bi1.6Pb0.4Sr2CaCu2Oδ in vacuum with different annealing temperature has been carried out by x-ray diffraction and Raman scattering measurements. It is found that with annaling temperature increasing, the a, b and c axis parameter elongate; the intensity of 294cm-1 peak that is assigned to O(1)CuBg mode decreases, and the peak position red-shifts. By further studying, it suggests that the 464cm-1 and 630cm-1 phonon can be assigned to O(3)Bi A1g and O(2)Sr A1g c-axis vibration respectively; the change of O(1)Cu Bg mode is caused by the change of carrier concentration which leads to the increasing of Tc.