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Mn位W掺杂对La0.3Ca0.7MnO3体系磁结构的影响
引用本文:郭焕银,刘 宁,蔡之让,张裕恒.Mn位W掺杂对La0.3Ca0.7MnO3体系磁结构的影响[J].物理学报,2006,55(2):865-872.
作者姓名:郭焕银  刘 宁  蔡之让  张裕恒
作者单位:(1)宿州学院材料研究室,宿州 234000; (2)宿州学院材料研究室,宿州 234000;中国科学技术大学结构分析开放实验室,合肥 230026; (3)中国科学技术大学结构分析开放实验室,合肥 230026
基金项目:国家自然科学基金重点(批准号:19934003)、国家重点基础研究发展规划(批准号:No. 001CB610604)和安徽省高等学校自然科学研究(批准号:2005KJ234)资助的课题.
摘    要:通过对La0.3Ca0.7Mn1-xWxO3(x=0.00,0.04,0.08,0.12,0.15)多晶样品M-T曲线、M-H曲线及ESR谱的测量,研究了Mn位W掺杂对电荷有序体系La0.3Ca0.7MnO3磁结构的影响.结果表明,当掺杂量为0.00≤x≤0.08时,体系存在电荷有序(CO)相,AFM/CO态共存于相变温度以下,电荷有序温度TCO随着W掺杂量的增加而增加;x=0.04时,样品在低温下为FM相与AFM/CO相共存,在CO相建立前、后均有FM从PM中分离出来;当x≥0.12时,CO态融化,在极低温度下存在顺磁-铁磁(PM-FM)相变. 关键词: 磁结构 电荷有序 融化 Mn位掺杂

关 键 词:磁结构  电荷有序  融化  Mn位掺杂
文章编号:1000-3290/2006/55(02)/0865-08
收稿时间:4/6/2005 12:00:00 AM
修稿时间:6/8/2005 12:00:00 AM

Influences of W doping at Mn site on magnetic structure of La0.3Ca0.7MnO3 system
Guo Huan-Yin,Liu Ning,Cai Zhi-Rang and Zhang Yu-Heng.Influences of W doping at Mn site on magnetic structure of La0.3Ca0.7MnO3 system[J].Acta Physica Sinica,2006,55(2):865-872.
Authors:Guo Huan-Yin  Liu Ning  Cai Zhi-Rang and Zhang Yu-Heng
Institution:1.Materials Research Laboratory, Suzhou College, Suzhou 234000, China; 2. Structure Research Laboratory , University of Science and Technology of China, Hefei 230026,China
Abstract:The influences of W doping at Mn site on the magnetic structure of the charge-ordering system La0.3Ca0.7MnO3 are studied by the measurements of M_T curves,M_H curves and ESR spectra of polycrystalline samples of La0.3Ca0.7Mn1-xWxO3(x=0.00,0.04,0.08,0.12,0.15) are studied. The results show that when the doping amount is 0.00≤x≤0.08, the charge-ordering(CO) phase exists in the system, the AFM/CO states coexist below the transition temperature, and the charge-ordering temperature Tco goes up with the increase of W doping content. For the sample of x=0.04, FM phase and AFM/CO phases coexist at low temperature, and FM is separated from PM both before and after the formation of CO phase; when x≥0.12, CO state melts, and the paramagnetism-ferromagnetism (PM-FM) transition exists at extremely low temperature.
Keywords:magnetic structure  charge ordering  melt  doping at Mn site
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