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Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 47: Poster III

MA 47.29: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster D

Ferromagnetic quantum critical point in Sr1−xCaxRuO3 approximated by artificial [SROn/CROm]l superlattices — •Robin Heumann, Robert Gruhl, and Philipp Gegenwart — Experimentalphysik VI, Universität Augsburg, 86159 Augsburg, Germany

Partial substitution of smaller Ca to the Sr site in the itinerant ferromagnetic SrRuO3 (SRO) leads to the suppression of magnetic order and interesting non-Fermi liquid properties beyond about 70% Ca concentration [1]. However, the quantum critical point can smear out strongly by structural disorder [2]. Therefore, we explore the possibility whether a quantum critical point could also be realized in structurally ordered epitaxial heterostructures of SRO and CaRuO3 (CRO).

Heterostructures [SROn/CROm]l/STO(001) with m = 2n and m = 3n were prepared by metal organic aerosol deposition. Structural studies were performed via X-ray diffraction, reciprocal space mapping and TEM imaging. The electronic and magnetic properties were investigated via Hall-, magnetoresistance and magnetization measurements and compared to Sr1−xCaxRuO3 thin films with x = 2/3 and x = 3/4.

[1] M. Schneider et al., phys. stat. sol. (b), 247 (2010) 200983004.

[2] L. Demkó et al., Phys. Rev. Lett 108 (2012) 185701.

Keywords: Perovskite; Transition Metal Oxide; Quantum Phase Transition; Ruthenate; Superlattice

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