SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Poster: Correlated Electrons II

TT 43.7: Poster

Mittwoch, 29. März 2023, 15:00–18:00, P2/OG3

Influence of lattice strain on the electronic and magnetic properties of SrRuO₃/SrTiO₃ heterostructures — •Robin Heumann, Robert Gruhl, and Philipp Gegenwart — Experimentalphysik VI, Universität Augsburg, 86159 Augsburg, Germany

Layered ruthenate Sr₂RuO4, consisting of strontium- and ruthenium-oxide stacks along the c-axis, is a prototype unconventional superconductor and continues to attract strong interest. Artificial heterostructures composed of layers of SrRuO₃ (SRO) and SrTiO₃ (STO) were recently considered by band-structure calculations [1,2]. It is predicted that SRO₁/STO₁ bilayers show a variety of emergent quantum states tunable by lattice strain, including ferro- and checkerboard-type antiferromagnetism, spin-density waves [1] and even unconventional superconductivity [2].

Utilizing metal-organic aerosol deposition [SRO_n/STO_n]_m epitaxial heterostructures were grown. The superlattices show sharp interfaces and an atomically smooth surface morphology. Different substrates were used to study the effect of tensile and compressive lattice strain. Besides structural studies by x-ray diffraction, reciprocal space mapping and TEM imaging we utilized Hall- and magnetoresistance as well as magnetization measurements to investigate the electronic and magnetic properties.

[1] M. Kim et al., Phys. Rev. B 106 (2022) L201103.

[2] B. Kim et al., Phys. Rev. B 101 (2020) 220502(R).