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Cobalt-based pyroxenes: A new playground for Kitaev physics.

Pavel A Maksimov1,2, Alexey V Ushakov2, Andrey F Gubkin2,3

  • 1Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region 141980, Russia.

Proceedings of the National Academy of Sciences of the United States of America
|October 18, 2024
PubMed
Summary

We explored magnetic interactions in SrCoGeO using neutron scattering and theory. Pyroxenes show promise as a platform for Kitaev physics, offering new avenues for research.

Keywords:
Kitaev modelfrustrated magnetisminelastic neutron scatteringpyroxenes

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Magnetism

Background:

  • Cobaltites are investigated for Kitaev physics in honeycomb systems and Ising models.
  • Pyroxene materials offer a unique structural basis for exploring complex magnetic phenomena.

Purpose of the Study:

  • To investigate the magnetic properties of pyroxene SrCoGeO.
  • To determine the key magnetic interactions governing the material's behavior.
  • To assess the potential of pyroxenes as a platform for Kitaev physics.

Main Methods:

  • Inelastic neutron scattering (INS) powder spectra analysis.
  • Ab initio calculations and linear spin-wave theory.
  • Heat capacity measurements under an external magnetic field.

Main Results:

  • A modified Kitaev model, specifically an extended Kitaev-Heisenberg model with anisotropic exchange, accurately describes the magnetic interactions.
  • The twisted chains of edge-sharing octahedra around Co ions are crucial.
  • A field-induced transition from antiferromagnetic ordering to a new state was observed around 13 T.

Conclusions:

  • SrCoGeO exhibits magnetic interactions well-described by an extended Kitaev-Heisenberg model.
  • Pyroxenes, especially with Si substitution, are identified as a promising platform for realizing the Kitaev model.
  • This work advances the understanding of Kitaev physics in novel material systems.