The Mott insulator LaTiO_3 in heterostructures with SrTiO_3 is metallic

Details The Mott insulator LaTiO_3 in heterostructures with SrTiO_3 is metallic The Mott insulator LaTiO_3 in heterostructures with SrTiO_3 is metallic

2007-11-04

arxiv.org/abs/0711.0516v1

Phys.Rev.B77, 115350 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.115350

It is shown that LaTiO_3 in superlattices with SrTiO_3 is not a Mott insulator but a strongly correlated metal. The tetragonal lattice geometry imposed by the SrTiO_3 substrate leads to an increase of the Ti 3d t2g band width and a reversal of the t2g crystal field relative to the orthorhombic bulk geometry. Using dynamical mean field theory based on finite-temperature multi-band 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 LaTiO_3. The metalicity of these heterostructures is therefore not an interface property but stems from all LaTiO_3 planes.

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