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Turning a nickelate Fermi surface into a cupratelike one through heterostructuring
P Hansmann1, Xiaoping Yang, A Toschi
1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Physical Review Letters
|August 8, 2009
Summary
Electronic correlations in nickelate heterostructures create a cuprate-like Fermi surface. This finding suggests orbital engineering is possible, potentially mimicking high-temperature cuprate superconductors.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Chemistry
Background:
- High-temperature cuprate superconductors exhibit unique electronic properties.
- Nickelate heterostructures offer a platform for exploring novel electronic phases.
Purpose of the Study:
- To investigate the electronic structure of hole-doped LaNiO3/LaAlO3 heterostructures.
- To determine the role of electronic correlations and orbital contributions.
- To compare the properties of nickelate heterostructures with cuprate superconductors.
Main Methods:
- Utilizing the local density approximation (LDA) combined with dynamical mean-field theory (DMFT).
- Analyzing the Fermi surface topology and orbital contributions.
- Investigating antiferromagnetic correlations.
Main Results:
- A single-sheet, cupratelike Fermi surface is induced by electronic correlations.
- The Ni 3d3z(2)-1 orbital acts analogously to the Cu 4s-like orbital in cuprates.
- Strong antiferromagnetic correlations are present.
Conclusions:
- Orbital engineering via heterostructuring is feasible.
- Nickelate heterostructures exhibit low-energy electronic and spin excitations similar to cuprates.
- These findings pave the way for designing new high-temperature superconductors.
