Technical advancements in oxide molecular beam epitaxy (MBE) have opened new avenues for studying various quantum transport phenomena in correlated transition-metal oxides, as exemplified by the exotic superconductivity of Sr₂RuO₄ and quantum oscillations of SrRuO₃. On the other hand, film research of another Ruddlesden-Popper strontium ruthenate Sr₃Ru₂O₇, which exhibits a unique quantum phase related to metamagnetism in bulk systems, has not progressed well. Here, we report the fabrication of high-quality Sr₃Ru₂O₇ thin films by oxide MBE and the observation of a strain-induced ferromagnetic ground state. The change in magnetic exchange coupling evaluated by first-principles calculations indicates a systematic relation between the compression of the c-axis length and induced ferromagnetism. Giant epitaxial strain in high-quality films will be a key to a comprehensive understanding of the magnetism in Ruddlesden-Popper strontium ruthenates Srₙ₊₁RuₙO₃ₙ₊₁, which sensitively depends on the ratio of in-plane to out-of-plane Ru-Ru distances.
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Oshima et al. (2024) studied this question.
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