Y替代对过渡金属氧化物YbCrO_3体系反常磁化特性的影响  

EFFECT OF Y-DOPING ON NOVEL MAGNETIZATION IN PEROVSKITE YbCrO_3 COMPOUNDS

作　　者：黎力[1] 邢芝鸠[1] 邓冬梅[1] 袁淑娟[1] 曹世勋[1] 张金仓[1] 

机构地区：[1]上海大学物理系,上海200444

出　　处：《低温物理学报》2011年第6期427-433,共7页Low Temperature Physical Letters

基　　金：国家自然科学基金(批准号:11074163)资助的课题~~

摘　　要：为澄清过渡金属稀土铬氧化物YbCrO3体系中存在反常负磁化现象的物理机制,本文报道了作者通过非磁性离子Y于A位替代对过渡金属稀土铬氧化物YbCrO3体系中存在的反常负磁化特性影响的系统研究结果.实验表明,Y离子的掺杂有效抑制了母相低温下场冷测试模式中的负磁化现象,提高了零场冷测试模式中的负磁化现象出现的阈值场,证明YbCrO3体系中的负磁化现象主要起源于A位稀土离子的顺磁效应.Except the negative magnetization observed in a field-cooled mode, it was also found that the ytterbium orthochromate YbCrO3 exhibits special large negative magnetization when its magnetization-temperature （M- T） curves are measured in a ZFC（zero field-cooled） mode with high applied fields （≥100Oe）. The similar qualitative behavior was observed also for non-magnetic Y^3＋ doped Yb1-xYxCrO3 with 0.1≤x≤0. 5. Y doping obviously restrains the negative magnetization in the low temperature during field cooling （FC） process and increases the threshold of magnetic applied field for negative magnetization in MZPC curve with zero field cooling. The result confirms that in YbCrO3, the zero magnetization is attributed to the paramagnetic effect of Yb ions whose magnetic moments direction becomes aligned opposite to the canted Cr moments.

关 键 词：稀土铬氧化物 Y掺杂 负磁化现象 

分 类 号：O482.5[理学—固体物理]