: A Dirac-Mott insulator with ferromagnetism near 100 K
- National Inst. for Materials Science (NIMS), Tsukuba (Japan). Research Center for Functional Materials; Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- Leibniz Institute for Solid State and Materials Research, Dresden (Germany); Condensed Matter Physics Research Center (Nepal)
- National Inst. for Materials Science (NIMS), Tsukuba (Japan). Research Center for Functional Materials; ; Hokkaido University (Japan). Graduate School of Chemical Sciences and Engineering
- Gakushuin University, Tokyo (Japan). Department of Chemistry
- National Inst. for Materials Science (NIMS), Tsukuba (Japan)
- National Inst. for Materials Science (NIMS), Tsukuba (Japan). Materials Analysis Station
- Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
- National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
- National Synchrotron Radiation Research Center, Hsinchu (Taiwan); National Tsing Hua University, Hsinchu (Taiwan). Department of Physics
- National Institute for Materials Science (Japan). Synchrotron X-ray Station at SPring-8
- Leibniz Institute for Solid State and Materials Research, Dresden (Germany); Dresden Center for Computational Materials Science (Germany)
In this study, the ferromagnetic semiconductor Ba2NiOsO6 ( Tmag ~ 100 K ) was synthesized at 6 GPa and 1500 °C. It crystallizes into a double perovskite structure [Fm - 3m ; a = 8.0428 ( 1 ) Å], where the Ni2+ and Os6+ ions are perfectly ordered at the perovskite B site. We show that the spin-orbit coupling of Os6+ plays an essential role in opening the charge gap. The magnetic state was investigated by density functional theory calculations and powder neutron diffraction. The latter revealed a collinear ferromagnetic order in a > 21 kOe magnetic field at 5 K. The ferromagnetic gapped state is fundamentally different from that of known dilute magnetic semiconductors such as (Ga,Mn)As and (Cd,Mn)Te ( Tmag < 180 K ), the spin-gapless semiconductor Mn2 CoAl ( Tmag ~ 720 K ), and the ferromagnetic insulators EuO ( Tmag ~ 70 K ) and Bi3Cr3O11 ( Tmag ~ 220 K ). It is also qualitatively different from known ferrimagnetic insulators and semiconductors, which are characterized by an antiparallel spin arrangement. Our finding of the ferromagnetic semiconductivity of Ba2NiOsO6 should increase interest in the platinum group oxides, because this alternative class of materials should be useful in the development of spintronic, quantum magnetic, and related devices.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1338555
- Alternate ID(s):
- OSTI ID: 1338089
- Journal Information:
- Physical Review B, Vol. 94, Issue 23; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Ferromagnetism above 1000 K in a highly cation-ordered double-perovskite insulator Sr3OsO6
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journal | February 2019 |
Structural and magnetic studies of KOsO 4 , a 5d 1 quantum magnet oxide
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journal | January 2019 |
Anomalous ferromagnetism and magneto-optical Kerr effect in semiconducting double perovskite and its (111) superlattice
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journal | August 2019 |
Ferromagnetism above 1000 K in highly cation-ordered double-perovskite insulator Sr3OsO6 | text | January 2018 |
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