Ferromagnetic state with large magnetic moments realized in epitaxially strained Sr3Ru2O7 films
arxiv(2024)
摘要
Technical advancement of oxide molecular beam epitaxy (MBE) has opened new
avenues for studying various quantum transport phenomena in correlated
transition-metal oxides, as exemplified by the exotic superconductivity of
Sr_2RuO_4 and quantum oscillations of SrRuO_3. On the other hand, film
research of another Ruddlesden-Popper strontium ruthenate Sr_3Ru_2O_7
which exhibits a unique quantum phase related to metamagnetism in bulk systems
did not progress well. Here we report the fabrication of high-quality
Sr_3Ru_2O_7 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 Sr_n+1Ru_nO_3n+1, which sensitively depends on the ratio
of in-plane to out-of-plane Ru-Ru distances.
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