Dimensionality control of d-orbital occupation in oxide superlattices

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Title
Dimensionality control of d-orbital occupation in oxide superlattices
Author(s)
Da Woon Jeong; Choi W.S.; Okamoto S.; Kim J.-Y.; Kim K.W.; Moon S.J.; Deok-Yong Cho; Lee H.N.; Noh , Tae Won
Publication Date
2014-08
Journal
SCIENTIFIC REPORTS, v.4, no., pp.6124 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Manipulating the orbital state in a strongly correlated electron system is of fundamental and technological importance for exploring and developing novel electronic phases. Here, we report an unambiguous demonstration of orbital occupancy control between t2g and eg multiplets in quasi-two-dimensional transition metal oxide superlattices (SLs) composed of a Mott insulator LaCoO3 and a band insulator LaAlO3. As the LaCoO3 sublayer thickness approaches its fundamental limit (i.e. one unit-cell-thick), the electronic state of the SLs changed from a Mott insulator, in which both t2g andeg orbitals are partially filled, to a band insulator by completely filling (emptying) the t2g (eg) orbitals. We found the reduction of dimensionality has a profound effect on the electronic structure evolution, which is, whereas, insensitive to the epitaxial strain. The remarkable orbital controllability shown here offers a promising pathway for novel applications such as catalysis and photovoltaics, where the energy of d level is an essential parameter.
URI
https://pr.ibs.re.kr/handle/8788114/942
ISSN
2045-2322
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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