High-Pressure Synthesis of Double Perovskite Ba2NiIrO6: In Search of a Ferromagnetic Insulator

Hai L Feng; Zheng Deng; Carlo U Segre; Mark Croft; Saul H Lapidus; Corey E Frank; Youguo Shi; Changqing Jin; David Walker; Martha Greenblatt

doi:10.1021/acs.inorgchem.0c03402

High-Pressure Synthesis of Double Perovskite Ba₂NiIrO₆: In Search of a Ferromagnetic Insulator

Inorg Chem. 2021 Jan 18;60(2):1241-1247. doi: 10.1021/acs.inorgchem.0c03402. Epub 2020 Dec 29.

Authors

Hai L Feng^{1

2}, Zheng Deng², Carlo U Segre³, Mark Croft⁴, Saul H Lapidus⁵, Corey E Frank¹, Youguo Shi², Changqing Jin², David Walker⁶, Martha Greenblatt¹

Affiliations

¹ Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, New Jersey 08854, United States.
² Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences (CAS), Beijing 100190, China.
³ Department of Physics and Center for Synchrotron Radiation Research and Instrumentation, Illinois Institute of Technology, 3101 South Dearborn Street, Chicago, Illinois 60616, United States.
⁴ Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, United States.
⁵ Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States.
⁶ Lamont Doherty Earth Observatory, Columbia University, 61 Route 9W, P.O. Box 1000, Palisades, New York 10964, United States.

PMID: 33373217
DOI: 10.1021/acs.inorgchem.0c03402

Abstract

Double perovskite oxides with d⁸-d³ electronic configurations are expected to be ferromagnetic from the Goodenough-Kanamori rules, such as ferromagnetic La₂NiMnO₆. In search of new ferromagnetic insulators, double perovskite Ba₂NiIrO₆ was successfully synthesized by high-pressure and high-temperature methods (8 GPa and 1573 K). Ba₂NiIrO₆ crystallizes in a cubic double perovskite structure (space group: Fm3̅m), with an ordered arrangement of NiO₆ and IrO₆ octahedra. X-ray absorption near-edge spectroscopy confirms the nominal Ni(II) and Ir(VI) valence states. Ba₂NiIrO₆ 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.