Magnetotransport Properties of Epitaxial Films and Hall Bar Devices of the Correlated Layered Ruthenate Sr₃Ru₂O₇

Layered strontium ruthenates of the Ruddlesden Popper phases, Sr_n+1Ru_nO_3n+1, are an enticing type of material among correlated oxides because they exhibit interesting properties like metamagnetism and nematic behaviors. Only a few attempts have been reported on epitaxial films and devices of Sr₃Ru₂O₇^[1]. In this project, we study the magnetotransport properties of epitaxially-grown phase-pure Sr₃Ru₂O₇ films prepared on several oxide substrates by both pulsed laser deposition^[2] and molecular beam epitaxy^[3].We will present the magnetotransport characteristics of Hall bar devices patterned side-by-side on the same films. Thin-film devices provide an advantage over single crystals because a comparative study could be done for thin-film devices patterned on the same film under similar conditions. By employing X-ray diffraction and STEM, we confirm that the films are phase pure. In the magnetotransport measurements, magnetoresistance values as high as 10% and 140% are achieved in films and devices, respectively. Our results provide an opportunity to explore more the physics of Sr₃Ru₂O₇ devices and in realizing emergent phenomena in correlated strontium ruthenates.

[1] P. B. Marshall et al., Phys. Rev. B 97, 155160 (2018).

[2] Ngabonziza et al., Phys. Rev. Mater. 8, 044401 (2024).

[3] S. Sajeev et al., in preparation (2025).