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Controlling inversion disorder in a stoichiometric spinel magnet.

Margarita G Dronova1, Feng Ye2, Scott E Cooper1

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Proceedings of the National Academy of Sciences of the United States of America
|October 18, 2022
PubMed
Summary

Controlling site disorder in frustrated quantum magnets like ZnFe2O4 is key. This study reveals that stoichiometric ZnFe2O4 crystals exhibit robust antiferroelectricity and revised spin behavior, not previously suggested exotic phases.

Keywords:
antiferroelectricityantiferromagnetic spinelinversion disorderneutron magnetic diffuse scatteringsingle-crystal growth

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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism
  • Materials Science

Background:

  • Frustrated quantum magnets require controlled site disorder for accurate study.
  • Pyrochlore spinel oxides are model systems for 3D quantum magnets.
  • The magnetism of ZnFe2O4 remains poorly understood due to disorder complexities.

Purpose of the Study:

  • To demonstrate simultaneous control of stoichiometry and inversion disorder in ZnFe2O4 crystal growth.
  • To revise the understanding of collective spin behavior and lattice symmetry in ZnFe2O4.
  • To investigate the potential of ZnFe2O4 in multiferroic devices.

Main Methods:

  • Single crystal growth of ZnFe2O4 with controlled stoichiometry and inversion disorder.
  • Structural analysis to determine lattice symmetry and space group.
  • Magnetic property measurements to probe collective spin behavior.

Main Results:

  • Stoichiometric ZnFe2O4 crystals with minimal inversion disorder were successfully grown.
  • Exotic spin phases previously suggested for ZnFe2O4 were contradicted.
  • The crystal structure was confirmed in the [Formula: see text] space group, exhibiting broken inversion symmetry.
  • Antiferroelectricity was induced by the broken inversion symmetry.
  • Site disorder was shown to effectively tune magnetic behavior in the presence of antiferroelectricity.

Conclusions:

  • ZnFe2O4 in its stoichiometric form with low inversion disorder does not exhibit previously proposed exotic spin phases.
  • The material possesses broken inversion symmetry, leading to robust antiferroelectricity.
  • ZnFe2O4 is a promising candidate for multiferroic applications due to tunable magnetic properties and inherent antiferroelectricity.