%0 Journal Article
%A Ishida, H.
%A Liebsch, A.
%T Origin of metallicity of LaTiO3/SrTiO3 heterostructures
%J Physical review / B
%V 77
%N 11
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-2330
%P 115350
%D 2008
%Z Record converted from VDB: 12.11.2012
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000254542800146
%R 10.1103/PhysRevB.77.115350
%U https://juser.fz-juelich.de/record/2330