title: High-temperature ferrimagnetism driven by lattice distortion in double perovskite Ca2FeOsO6.
abstract: 5d and 3d hybrid solid-state oxide Ca2FeOsO6 crystallizes into an ordered double-perovskite structure with a space group of P2₁/n with high-pressures and temperatures. Ca2FeOsO6 presents a long-range ferrimagnetic transition at a temperature of ~320 K (T(c)) and is not a band insulator, but is electrically insulating like the recently discovered Sr2CrOsO6 (T(c) ~725 K). The electronic stat of Ca2FeOsO6 is adjacent to a half-metallic state as well as that of Sr2CrOsO6. In addition, the high-T(c) ferrimagnetism was driven by lattice distortion, which was observed for the first time among double-perovskite oxides and represents complex interplays between spins and orbitals. Unlike conventional ferrite and garnet, the interplays likely play a pivotal role of the ferrimagnetism. A new class of 5d-3d hybrid ferrimagnetic insulators with high-T(c) is established to develop practically and scientifically useful spintronic materials.
authors.affiliation: Superconducting Properties Unit, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Hai L
authors.initials: HL
authors.lastname: Feng
authors.forename: Masao
authors.initials: M
authors.lastname: Arai
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Matsushita
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Tsujimoto
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Guo
authors.forename: Clastin I
authors.initials: CI
authors.lastname: Sathish
authors.forename: Xia
authors.initials: X
authors.lastname: Wang
authors.forename: Ya-Hua
authors.initials: YH
authors.lastname: Yuan
authors.forename: Masahiko
authors.initials: M
authors.lastname: Tanaka
authors.forename: Kazunari
authors.initials: K
authors.lastname: Yamaura