TY  - JOUR
AU  - Ishida, H.
AU  - Liebsch, A.
TI  - Origin of metallicity of LaTiO3/SrTiO3 heterostructures
JO  - Physical review / B
VL  - 77
IS  - 11
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-2330
SP  - 115350
PY  - 2008
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000254542800146
DO  - DOI:10.1103/PhysRevB.77.115350
UR  - https://juser.fz-juelich.de/record/2330
ER  -