Strain control of orbital polarization and correlated metal-insulator transition in La2CoMnO6 from first principles

Strain control of orbital polarization and correlated metal-insulator transition in La2CoMnO6 from first principles
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从第一原理对 La2CoMnO6 中轨道极化和相关金属-绝缘体转变的应变控制

DOI:
10.1063/1.3662859
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发表时间:
2011-11
影响因子:
4
通讯作者:
Meng, Jian
Meng, Jian
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lv, Shuhui;Li, Hongping;Wang, Zhongchang;Han, Lin;Liu, Yao;Liu, Xiaojuan;Meng, Jian

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过渡金属氧化物具有丰富的物理性质,常受外界扰动的影响。在这里,我们用第一性原理计算,应变使Co2+在La2CoMnO6中的轨道占位发生变化,从而改变了La2CoMnO6的电子结构。我们在La2CoMnO6中发现了金属-绝缘体的转变,这种转变源于应变引起的晶格畸变和电子关联之间的相互作用。这种转变是根据Co2+的轨道极化来理解的,Co2+在压缩下呈现dxz/yz字符,但在拉伸下转换为dx2-y2字符。提出的轨道转换应该会为许多技术应用带来希望。
Transition metal oxides show rich physical properties which are often influenced by external perturbation. Here, we report by first-principles calculations that strain enables switching of orbital occupancy of Co2+ in La2CoMnO6 and hence modifies electronic structure of La2CoMnO6. We find a metal-insulator transition in La2CoMnO6, which originates from the interplay between the strain induced lattice distortion and electron correlations. Such transition is understood upon the orbital polarization of Co2+, which takes on the dxz/yz character under compression, yet switches to the dx2-y2 character under tension. The orbital switching presented should hold promise for many technological applications.
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