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000002330 1001_ $$0P:(DE-HGF)0$$aIshida, H.$$b0
000002330 245__ $$aOrigin of metallicity of LaTiO3/SrTiO3 heterostructures
000002330 260__ $$aCollege Park, Md.$$bAPS$$c2008
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000002330 520__ $$aIt 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.
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000002330 7001_ $$0P:(DE-Juel1)VDB941$$aLiebsch, A.$$b1$$uFZJ
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000002330 8567_ $$uhttp://dx.doi.org/10.1103/PhysRevB.77.115350
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