Charge transfer and interfacial magnetism in (LaNiO3)n/(LaMnO3)2 superlattices
Charge transfer and interfacial magnetism in (LaNiO3)n/(LaMnO3)2 superlattices
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DOI：
10.1103/physrevb.88.144411
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发表时间：
2013-10-10
影响因子：
3.7
通讯作者：
Bhattacharya, A.
中科院分区：
文献类型：
--
作者：
Hoffman, J.;Tung, I. C.;Bhattacharya, A.
采用臭氧辅助分子束外延技术生长了(LaNiO_3)(N)/(LaMnO_3)(2)超晶格，其中LaNiO_3为顺磁性金属，LaMnO_3为反铁磁性绝缘体。超晶格显示出良好的结晶度和不到一个晶胞的界面粗糙度。X-射线能谱和二色性测量表明，电子从LaMnO_3向LaNiO_3转移，在LaNiO_3中诱导磁性。磁输运测量表明，当LaNiO_3层厚度从5个晶胞减少到2个单位晶胞时，从金属到绝缘的转变，表明LaNiO_3内部存在不均匀的磁结构。
(LaNiO3)(n)/(LaMnO3)(2) superlattices were grown using ozone-assisted molecular beam epitaxy, where LaNiO3 is a paramagnetic metal and LaMnO3 is an antiferromagnetic insulator. The superlattices exhibit excellent crystallinity and interfacial roughness of less than one unit cell. X-ray spectroscopy and dichroism measurements indicate that electrons are transferred from the LaMnO3 to the LaNiO3, inducing magnetism in LaNiO3. Magnetotransport measurements reveal a transition from metallic to insulating behavior as the LaNiO3 layer thickness is reduced from five to two unit cells and suggest an inhomogeneous magnetic structure within LaNiO3.