Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 80: Low-Dimensional Systems - Poster Session

TT 80.8: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

MBE-growth of LaNiO₃ based heterostructures - From empirical growth to designing new materials — •Friederike Wrobel, Gennady Logvenov, Georg Christiani, Eva Benckiser, and Bernhard Keimer — Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany

Motivated by predictions of model calculations, which showed that heterostructured nickelates provide the essential ingredients for the occurrence of high T_c-superconductivity [1], we started to investigate these materials. Confinement and strain influence the structure, orbital occupation and electronic as well as magnetic properties [2,3]. Superlattices with 2 unit-cell thick layers of LaAlO₃ (LAO) and 2 layers of LaNiO₃ (counted in pseudo-cubic unit cells) show a transition to an antiferromagnetically ordered state at low temperatures. In contrast, samples with a periodicity of 4 layers of LaNiO₃ remain paramagnetic/metallic at all temperatures. Here, we present first results on how to extend our study on nickelate superlattices. Our goal is to modify the electronic and magnetic structure by charge carrier doping, either via oxygen reduction or chemical doping. Oxide molecular beam epitaxy (oxide MBE) is used to realize new superlattice systems and to improve the sample quality.
J. Chaloupka, G. Khaliullin, Phys. Rev. Lett. 100, 016404 (2008)
[2] M. Wu et al., Phys. Rev. B 88, 125124 (2013)
[3] A. Frano et al., Phys. Rev. Lett. 111, 106804 (2013)