A Polar Magnetic and Insulating Double Corundum Oxide: Mn2MnSbO6with Ordered Mn(II) and Mn(III) Ions

  • Hai L. Feng
  • , Chang Jong Kang
  • , Bongjae Kim
  • , Kyoo Kim
  • , Mark Croft
  • , Sizhan Liu
  • , Trevor A. Tyson
  • , Eli Stavitski
  • , Rui Zu
  • , Venkatraman Gopalan
  • , Saul H. Lapidus
  • , Corey E. Frank
  • , Youguo Shi
  • , David Walker
  • , Martha Greenblatt

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A new magnetic insulator Mn2MnSbO6 with a polar crystal structure and an ordered Mn2+ and Mn3+ arrangement was synthesized under a high pressure of 7.5 GPa and 1300 °C. The crystal structure of Mn2MnSbO6, investigated by synchrotron powder X-ray diffraction, was found to be isomorphous with that of Ni3TeO6-type, space group R3. The non-centrosymmetric structure was confirmed by the second-harmonic generation measurements. The X-ray absorption near-edge spectroscopy measurement confirmed the nominal oxidation states of Mn2+2Mn3+SbO6. Magnetic measurements indicate that Mn2MnSbO6 orders antiferromagnetically below 44 K and undergoes a field-induced spin-flop transition at 5 K. First-principles calculations indicate an antiferromagnetic ground state with up/up/up/down/down/down (uuuddd) spin configuration of the six crystallographically unique Mn ions in the c-axis doubled magnetic structure. The density functional theory calculations also substantiate the experimentally observed charge ordering of the Mn2+/Mn3+ ions and the insulating behavior due to a bandgap of 0.52 eV. To the best of our knowledge, this is the first double corundum oxide containing Jahn-Teller active Mn3+ ions.

Original languageEnglish (US)
Pages (from-to)6522-6529
Number of pages8
JournalChemistry of Materials
Volume33
Issue number16
DOIs
StatePublished - Aug 24 2021

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry

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