Feng Hai L, Deng Zheng, Segre Carlo U, Croft Mark, Lapidus Saul H, Frank Corey E, Shi Youguo, Jin Changqing, Walker David, Greenblatt Martha
Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, United States.
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences (CAS), Beijing 100190, China.
Inorg Chem. 2021 Jan 18;60(2):1241-1247. doi: 10.1021/acs.inorgchem.0c03402. Epub 2020 Dec 29.
Double perovskite oxides with d-d electronic configurations are expected to be ferromagnetic from the Goodenough-Kanamori rules, such as ferromagnetic LaNiMnO. In search of new ferromagnetic insulators, double perovskite BaNiIrO was successfully synthesized by high-pressure and high-temperature methods (8 GPa and 1573 K). BaNiIrO crystallizes in a cubic double perovskite structure (space group: 3̅), with an ordered arrangement of NiO and IrO octahedra. X-ray absorption near-edge spectroscopy confirms the nominal Ni(II) and Ir(VI) valence states. BaNiIrO displays an antiferromagnetic order at 51 K. The positive Weiss temperature, however, indicates that ferromagnetic interactions are dominant. Isothermal magnetization curves at low temperatures support a field-induced spin-flop transition.
