详细信息
文献类型:期刊文献
中文题名:稀土锰氧化物的Mn位掺杂效应
英文题名:Mn-site Doping Effects in Rare Earth Manganites
作者:姚恺[1];贾忠伟[2]
第一作者:姚恺
机构:[1]新乡师范高等专科学校物理系,河南新乡453000;[2]新乡广播电视大学,河南新乡453000
第一机构:新乡学院物理与电子工程学院
年份:2006
卷号:20
期号:5
起止页码:26-29
中文期刊名:新乡师范高等专科学校学报
外文期刊名:Journal of Xinxiang Teachers College
语种:中文
中文关键词:稀土锰氧化物;Mn位掺杂;输运特性;物理机制;微观机理;峰值电阻率;CMR效应
外文关键词:manganites; Mn-site doping; transport properties
摘要:Mn位掺杂是调整稀土锰氧化物中Mn^3+-O^2--Mn^4+网络的一种十分有效的方法,对理解稀土锰氧化物材料的物理机制和微观机理具有重要作用。在Ln1-xAxMnO3体系中,当x=0.3左右时,Mn位微量掺杂即可破坏原有的长程铁磁有序与金属性共存,而产生团簇玻璃型(短程)铁磁有序行为;多数情况下,TP降低,对应的峰值电阻率ρp急剧升高,居里温度Tc降低,CMR效应增强。当x=0.5时,通过在Mn位掺杂可以使反铁磁绝缘母体产生铁磁金属性行为;电阻率急剧降低,出现CMR效应。
An interesting way to modify the crucial Mn^3+ - O^2- - Mn^4+ network is to dope at the Mn site. For Ln1-xA, MnO3 (x - 0.3) , the doping of even a small amount of transition metal ions at Mn site tends to destroy the long -range FM order and leads to the cluster-glass type. It was found that all these doping reduce the ferromagnetic (FM) transition temperature Tc and the metal-insulator transition temperature Tp. The resistivity of the peak temperature Tp and the CMR effect increase. For x =0.5, the doping at the Mn-site leads to the FM metallic state at the expense of the AFM insulated state. The resistivity decreases rapidly and the CMR effect was induced.
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