Ca2+离子取代对SrRuO3结构与磁性的影响  

Effects of Ca2+ Ion Substitution on the Structure and Magnetism of SrRuO3

作　　者：张文颖 甄聪棉[1] 侯登录[1] ZHANG Wenying;ZHEN Congmian;HOU Denglu(College of Physics,Hebei Normal University,Hebei Shijiazhuang 050024,China)

机构地区：[1]河北师范大学物理学院,河北石家庄050024

出　　处：《河北师范大学学报（自然科学版）》2020年第3期215-220,共6页Journal of Hebei Normal University：Natural Science

基　　金：河北省自然科学基金(A2018205144)。

摘　　要：通过Ca2+取代A位的Sr2+,研究SrRuO3的结构与磁性的变化.结果表明,随Ca2+取代量的增加,晶格常数减小,正交畸变更加明显,饱和磁化强度和居里温度均随之减小,最终铁磁性的SrRuO3变化到顺磁性的CaRuO3.临界指数β拟合结果表明,SrRuO3的磁性可由平均场模型解释.β值随Ca2+取代量的增加而增加.实验证实了SrRuO3中既有巡游磁性又有局域磁性,且与相关理论研究结果一致.The structural and magnetic changes of SrRuO3 were studied by substituting Ca2+ for Sr2+ at A site.The results show that with the increase of Ca substitution,the lattice constant decreases,the orthogonal distortion becomes more obvious,the saturation magnetization and Curie temperature TC decrease,and finally the ferromagnetic SrRuO3 changes to paramagnetic CaRuO3.The critical exponent β is obtained by fitting the experimental data,indicating that the magnetic properties of SrRuO3 can be explained by the mean field model.The value of β increases with the substitution x of Ca2+ ion.The co-existence of itinerant and local magnetism in SrRuO3 has been confirmed by experiments and is consistent with the recent theoretical results.

关 键 词：巡游铁磁性 磁化强度 居里温度 临界指数 平均场模型 

分 类 号：O469[理学—凝聚态物理]