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Multiphase magnetism in Yb2Ti2O7.

Allen Scheie1,2,3, Jonas Kindervater4,2, Shu Zhang4,2,5

  • 1Institute for Quantum Matter, Johns Hopkins University, Baltimore, MD 21218; scheieao@ornl.gov.

Proceedings of the National Academy of Sciences of the United States of America
|October 24, 2020
PubMed
Summary

Ferromagnetism and antiferromagnetism coexist in the quantum magnet [Formula: see text]. This multiphase magnetism explains the material's unusual properties, including its sensitivity to disorder.

Keywords:
frustrated magnetismneutron scatteringphase transitionspyrochlore

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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism

Background:

  • Quantum magnets exhibit complex magnetic behaviors.
  • Understanding the ground state of pyrochlore quantum magnets is crucial for materials science.

Purpose of the Study:

  • To investigate the coexistence of magnetic orders in the pyrochlore quantum magnet [Formula: see text].
  • To elucidate the relationship between multiphase magnetism and the material's observed properties.

Main Methods:

  • Neutron scattering techniques (Bragg peaks, inelastic, and small-angle) were employed.
  • Classical Monte Carlo simulations were performed using inferred exchange interactions.

Main Results:

  • Evidence for coexistence of long-range ferromagnetic order and short-range antiferromagnetism was found.
  • Mesoscale magnetic structures associated with metastable antiferromagnetism were observed.
  • Simulations confirmed antiferromagnetism as metastable within the ferromagnetic ground state.

Conclusions:

  • The low-temperature state of [Formula: see text] is characterized by multiphase magnetism.
  • This coexistence explains the lack of coherent spin waves and sensitivity to disorder.