[1]朱德亮,曹培江,柳文军,等.Nd1-xCaxMnO3中A位替代导致的铁磁性及磁化强度跳变[J].深圳大学学报理工版,2007,24(1):18-23.
 ZHU De-liang,CAO Pei-jiang,LIU Wen-jun,et al.Ferromagnetism and magnetization steps induced by A-site substitution in Nd1-xCaxMnO3[J].Journal of Shenzhen University Science and Engineering,2007,24(1):18-23.
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Nd1-xCaxMnO3中A位替代导致的铁磁性及磁化强度跳变()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第24卷
期数:
2007年1期
页码:
18-23
栏目:
出版日期:
2007-01-30

文章信息/Info

Title:
Ferromagnetism and magnetization steps induced by A-site substitution in Nd1-xCaxMnO3
文章编号:
1000-2618(2007)01-0018-06
作者:
朱德亮12曹培江12柳文军12马晓翠12Raveau B3
1)深圳大学材料学院,深圳518060;
2)深圳市特种功能材料重点实验室,深圳518060;
3)Laboratoire CRISMAT,UMR CNRS ENSICAEN 6508,6 Boulevard Marechal Juin,14050 Caen Cedex 4,France
Author(s):
ZHU De-liang12CAO Pei-jiang12LIU Wen-jun12MA Xiao-cui12and Raveau B3
1)College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,P.R.China
2)Shenzhen Key Laboratory of Special Functional Materials,Shenzhen 518060,P.R.China
3)Laboratoire CRISMAT,UMR CNRS ENSICAEN 6508,6 Boulevard Marechal Juin,14050 Caen Cedex 4,France
关键词:
多晶Nd1-xCax-δBaδMnO3电荷轨道有序类马氏体相变相分离铁磁态反铁磁态A位尺寸失配反畸变效应
Keywords:
?polycrystalline Nd1-xCax-δBaδMnO3orbital and charge orderingmartensitic-like mechanismphase seperationferromagnetic stateantiferromagnetic stateA-site size mismatchthe “counter-distortion” effect
分类号:
O 482.5;O 513
文献标志码:
A
摘要:
研究多晶Nd1-xCax-δBaδMnO3(x=0.5,0.45)中,大尺寸Ba2+对Ca2+的替代可在样品中导致铁磁基态以及低温下阶梯状的磁化强度跳变.结果表明,因Ba2+的“反畸变效应”,样品中的铁磁百分比随Ba替代量的增加迅速增大,当δ为0.03~0.04时达到一极大值,然后随Ba替代量的增加而减小,这是由于此时对铁磁不利的A位阳离子间的尺寸失配占了优势.对相同的Ba替代量,高Nd(x=0.45)体系中的铁磁含量总是比低Nd(x=0.5)体系中的大很多.当增加磁场时,前一体系磁化强度的增加比后一体系迅速得多,在5.5 T磁场下其磁化强度极大值要显著大于后一体系的相应值,前一体系出现阶梯状跳变的临界磁场要小于后一体系.指出上述结果是由于Nd0.55Ca0.45MnO3中的电荷轨道序比Nd0.5Ca0.5MnO3较弱造成的.奇异的磁化强度跳变用建立在相分离基础上的类马氏体相变模型得到了较合理解释.
Abstract:
The substitution of Ba for Ca in polycrystalline Nd1-xCax-δBaδMnO3 (x=0.5,0.45) can induce a ferromagnetic (FM) ground state and magnetization steps at low temperature.The FM fraction first quickly increases with δ due to the local “counter-distortion” effect,reaching a maximum value for δ=0.03~0.04,then decreases as excess Ba is introduced because the A-site size mismatch has increased dramatically.The FM fraction for the x=0.45 system is much higher than that of the x=0.5 system for the same barium content.When the magnetic field is increased,the former series show higher magnetization and lower critical fields where the steps appear.These results are due to the weak orbital and charge odering of Nd0.55Ca0.45MnO3 compared to that of Nd0.5Ca0.5MnO3.The magnetization steps can be explained by a martensitic-like mechanism on the basis of phase separation.

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备注/Memo

备注/Memo:
收稿日期:2006-04-21
基金项目:深圳市科技计划资助项目(200503,200501)
作者简介:朱德亮(1972-),男(汉族),山东省广饶县人,深圳大学副教授、博士.E-mail:deliangzhu@163.com
更新日期/Last Update: 2007-12-09