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Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique

TT 32.19: Poster

Wednesday, March 25, 2009, 14:00–18:00, P1A

Turning a nickelate Fermi surface into a cuprate-like one through heterostructuring — •Philipp Hansmann1, 2, Xiaoping Yang1, Alessandro Toschi2, Giniyat Khaliullin1, Ole Krogh Andersen1, and Karsten Held21Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Institute of Solid State Physics, Vienna University of Technology, Austria

Using the local density approximation and its combination with dynamical mean field theory, we show that electronic correlations induce a single sheet cuprate-like Fermi surface for LaNiO3/LaAlO3 heterostructures, even though both eg orbitals contribute to it. This is possible because the correlations shift one of the two sheets above the Fermi level. As there are also strong antiferromagnetic fluctuations, the low-energy electronic and spin excitations resemble those of high-temperature cuprate superconductors.

[1] P.Hansmann, X. Yang, A. Toschi, G. Khaliullin, O.K. Andersen, K. Held, (arXiv:0710.2778) (2008)

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