Comparison of electronic structures of orthorhombic and hexagonal manganites studied by X-ray absorption spectroscopy

被引:16
作者
Asokan, K
Dong, CL
Bao, CW
Tsai, HM
Chiou, JW
Chang, CL
Pong, WF
Duran, P
Moure, C
Peña, O
机构
[1] Tamkang Univ, Dept Phys, Tamkang, Taiwan
[2] Inst Ceram & Vidrio, Electroceram Dept, Madrid 28049, Spain
[3] Univ Rennes 1, CNRS, UMR 6511, Inst Chim, F-35042 Rennes, France
关键词
manganites; XANES; electronic structure; X-ray absorption spectroscopy;
D O I
10.1016/j.ssc.2005.03.030
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Electronic structures of orthorhombic perovskite-type manganites (OM) and hexagonal manganites (HM) are compared by using X-ray absorption near edge structure spectroscopy. This study reveals that the environments around Mn and O ions in both the systems are different. These are reflected primarily in the lifting of degeneracy of the Mn 3d orbitals. Interestingly, the unoccupied Mn 3d(x)(-y)(2)(2) orbital in HM is strongly hybridized with O 2p states and appears to be responsible for both long range orderings: ferroelectnic ordering at high temperatures and ferromagnetic ordering at low temperatures. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:821 / 826
页数:6
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