Journal Article

PreJuSER-2330

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Origin of metallicity of LaTiO3/SrTiO3 heterostructures

Ishida, H. ; Liebsch, A.FZJ*

2008
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/11073  doi:10.1103/PhysRevB.77.115350

Abstract: It is shown that LaTiO3, in superlattices with SrTiO3, is a strongly correlated metal rather than a Mott insulator. The tetragonal lattice geometry imposed by the SrTiO3 substrate leads to an increase of the Ti 3dt(2g) bandwidth and a reversal of the t(2g) crystal field relative to the orthorhombic bulk geometry. Using dynamical mean field theory based on finite-temperature multiband exact diagonalization, we show that, as a result of these effects, local Coulomb interactions are not strong enough to induce a Mott transition in tetragonal LaTiO3. The experimentally observed metallicity of LaTiO3/SrTiO3 heterostructures is therefore caused not only by the interface but also by the tetragonal geometry of the LaTiO3 layers.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IFF-1)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2008

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Database coverage:
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