Hg掺杂对BaPb1-xBixO3超导体中Pb和O的化学环境的影响  

EFFECT ON CHEMICAL ENVIRONMENT OF PB AND O IN Hg-SUBSTITUTED BaPb_(1-x)Bi_xO_3 SUPERCONDUCTOR

作　　者：张勇[1] 陈永亮[1] 崔雅静[1] C．H．CHENG 赵勇[1,2] 

机构地区：[1]教育部磁浮技术与磁浮列车重点实验室西南交通大学超导研究开发中心,成都610031 [2]School of Materials Science and Engineering,University of New South Wales,Sydney 2052,NSW,Australia

出　　处：《低温物理学报》2008年第1期18-22,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:50372052,50430137,50588201);西南交通大学博士生创新基金项目资助的课题~~

摘　　要：采用XPS方法对BaPb1-xBixO3超导体以及Hg掺杂BaPb1-xBixO3超导体进行了对照研究,结果表明当Hg取代Pb后,位于18eV和22eV的价带的强度发生变化并与样品的超导转变温度相关联,O1s和Pb4f谱峰也随Hg掺入而发生位移,说明随Hg的掺入BaPb1-xBixO3超导体的化学环境发生改变.X-ray photoemission spectroscopy （XPS） studies of Hg-substituted BaPb0.75Bi0.25O3 superconductor BaPb0.75Bi0.25O3（BPHBO） are performed over a full compositional range between x=0 and x=0.75, and valence bands and core levels of BPHBO have been investigated covering the whole compositional range. With the substitution Hg for Pb, the valence band centered at 18eV and 22eV is found to be in concordance to the Tc of this system. Several features in the O1s and Pb4f core line XPS spectra are analyzed and systematic core-level shifts in the XPS spectra as functions of x are observed, which can be attributed to a chemical potential shift accompanying the Hg doping.

关 键 词：X光电子能谱 超导体 Hg掺杂 BaPb0.75Bi0.25O3 

分 类 号：O511.3[一般工业技术—材料科学与工程]