Sr掺杂Eu_(1-x)Sr_xMnO_3体系的核磁共振和磁结构研究  

Nuclear magnetic resonance and magnetic structure study on Sr doped Eu_(1-x)Sr_xMnO_3 system

作　　者：宋改贝[1] 曹世勋[1] 张佳佳[1] 袁淑娟[1] 清水建次 张金仓[1] 

机构地区：[1]上海大学理学院物理系,上海200444 [2]富山大学理学部,日本富山930-8555

出　　处：《物理学报》2012年第5期428-432,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50932003;11074163);上海市教育委员会科技创新基金重点项目(批准号:09ZZ95);上海市科学技术委员会重大基础研究计划(批准号:08dj1400202;10ZR1411000)资助的课题~~

摘　　要：对Eu_(1-x)Sr_xMnO_3(x=0.4,0.5,0.6,0.7)体系的磁结构进行了系统的研究.通过核磁共振实验,磁化测量,并结合电输运测量结果表明,Sr的掺入使得EuMnO_3反铁磁母相中出现铁磁相.铁磁相和反铁磁相的竞争导致样品在低温下的自旋玻璃行为.分析认为,Eu_(0.4)Sr_(0.6)MnO_3和Eu_(0.3)Sr_(0.7)MnO_3的磁结构在低温下呈现更加复杂的特征,主要源于铁磁团簇的形成以及无序相的存在.The magnetic properties of Eul-xSrxMnO3 （x = 0.4, 0.5, 0.6, 0.7） are systematically studied. Nuclear magnetic resonance, magnetization and electrical transport measurements are carried out, and the results indicate that the substitution of Sr for Eu could produce ferromagnetic phase in antiferromagnetic EuSrMnO3 matrix. The competition between ferromagnetic and antiferromagnetic phases induces the spin-glass behavior. In addition, the magnetic properties of Eu0.4Sr0.6MnO3 and Eu0.3Sr0.7MnO3 show more complex features at low temperatures, resulting mainly from the appearance of ferromagnetic clusters and the existence of disordered structure.

关 键 词：Sr掺杂锰氧化物 自旋玻璃 铁磁团簇 

分 类 号：O482.5[理学—固体物理]