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Publications in Scientific Journals:

P. Hansmann, A. Toschi, Y. Xiaoping, O. K. Andersen, K. Held:
"Electronic structure of nickelates: From two-dimensional heterostructures to three-dimensional bulk materials";
Physical Review B, 82 (2010), 235123; 1 - 10.



English abstract:
Electronic structure of nickelates: From two-dimensional heterostructures
to three-dimensional bulk materials
P. Hansmann,1 A. Toschi,1 Xiaoping Yang,2 O. K. Andersen,2 and K. Held1
1Institute for Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria
2Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany
Received 9 September 2010; published 16 December 2010
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 effectiv


"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1103/PhysRevB.82.235123

Electronic version of the publication:
http://publik.tuwien.ac.at/files/PubDat_201566.pdf


Created from the Publication Database of the Vienna University of Technology.