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MA: Fachverband Magnetismus

MA 47: Poster III

MA 47.29: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster D

Ferromagnetic quantum critical point in Sr_1−xCa_xRuO₃ approximated by artificial [SRO_n/CRO_m]_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 [SRO_n/CRO_m]_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 Sr_1−xCa_xRuO₃ 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