Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-11-04
Physical Review B 82, 235123 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 9 figures
Scientific paper
10.1103/PhysRevB.82.235123
Reduced dimensionality and strong electronic correlations, which are among the most important ingredients for cupratelike high-Tc superconductivity, characterize also the physics of nickelate-based heterostructures. Starting from the local-density approximation we arrive at a simple two-band model for quasi-two-dimensional 2D LaNiO3 /LaAlO3 heterostructures and extend it by introducing an appropriate hopping in the z direction to describe the dimensional crossover to three dimensions 3D. Using dynamical mean-field theory, we study the effects of electronic correlations with increasing interaction strength along the crossover from 2D to 3D. Qualitatively, the effects of electronic correlations are surprisingly similar, albeit quantitatively larger interaction strengths are required in three dimensions for getting a Mott-Hubbard insulating state. The exchange parameters of an effective Kugel-Khomskii-type spin-orbital model are also derived and reveal strong antiferromagnetic tendencies.
Andersen Ole Krogh
Hansmann P.
Held Karsten
Toschi Alessandro
Yang Xiaoping
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