Dresden 2009 – wissenschaftliches Programm

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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

Mittwoch, 25. März 2009, 14:00–18:00, P1A

Turning a nickelate Fermi surface into a cuprate-like one through heterostructuring — •Philipp Hansmann^{1, 2}, Xiaoping Yang¹, Alessandro Toschi², Giniyat Khaliullin¹, Ole Krogh Andersen¹, and Karsten Held² — ¹Max 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 e_g 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)