2018/06/25 by Yuki K. Wakabayashi, Yoshiharu Krockenberger, Naoto Tsujimoto +4 · 67 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Curie temperature #Electronic and Structural Properties of Oxides #Epitaxy #Fabrication #Ferromagnetism #Insulator (electricity) #Magnetic and transport properties of perovskites and related materials #Metal–insulator transition #Spintronics #Topological insulator #cond-mat.mtrl-sci
paper · pdf · doi:10.1038/s41467-019-08440-6
published in Nature Communications 10(1), 535 (Nature Portfolio)
arxiv created 2018/06/25 · openalex created_date 2018/07/10 · openalex publication_date 2019/02/12 · arxiv updated 2019/03/06 · openalex updated_date 2026/08/05
Abstract Magnetic insulators have wide-ranging applications, including microwave devices, permanent magnets and future spintronic devices. However, the record Curie temperature ( T C ), which determines the temperature range in which any ferri/ferromagnetic system remains stable, has stood still for over eight decades. Here we report that a highly B-site ordered cubic double-perovskite insulator, Sr 3 OsO 6 , has the highest T C (of ~ 1060 K) among all insulators and oxides; also, this is the highest magnetic ordering temperature in any compound without 3 d transition elements. The cubic B-site ordering is confirmed by atomic-resolution scanning transmission electron microscopy. The electronic structure calculations elucidate a ferromagnetic insulating state with J eff = 3/2 driven by the large spin-orbit coupling of Os 6+ 5 d 2 orbitals. Moreover, the Sr 3 OsO 6 films are epitaxially grown on SrTiO 3 substrates, suggesting that they are compatible with device fabrication processes and thus promising for spintronic applications.