OALib Journal期刊
ISSN: 2333-9721
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锆酸锶掺co后磁性质的第一性原理研究
DOI: 10.13232/j.cnki.jnju.2014.02.004
Keywords: 电子能带结构,磁性,第一性原理
Abstract:
本文使用在位库仑作用、局域密度近似下的投影缀加平面波方法,计算了钙钛矿材料锆酸锶(srzro3)-co之间的间距l为0.4097nm,即最近邻,且体系为铁磁构型时对应的总能b位后,容易出现co离子的团簇聚集,出现铁磁性;电子能带结构图显示co部分替代zr4+后变为co4+(3d)3+(3d)d轨道未占据,又由于掺杂co后其d轨道与近邻o的p轨道有强烈杂化,有部分co的d轨道及o的部分p轨道越过价带进入带隙,在0~2.60ev之间,自旋向上出现3条co3d能带,自旋向下出现7条co3d能带,且导带底向低能移动;部分co离子替代钙钛矿b位的zr4+后,体系出现磁性,由于co离子形式化合价为+3,替代zr4+后,这种空穴掺杂将在价带顶引入空的掺杂能级;态密度结果表明该能级为co4+离子部分空的d轨道,通过o的p轨道,造成体系中co3+、co4+离子的出现,而它们之间的双交换耦合使得体系出现铁磁性。
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