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Geometrical frustration versus Kitaev interactions in BaCo2(AsO4)2
Thomas Halloran1, Félix Desrochers2, Emily Z Zhang2
1Institute for Quantum Matter, Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218.
BaCo2(AsO4)2 (BCAO) does not host the Kitaev spin liquid state as predicted. Inelastic neutron scattering data favor the XXZ model over the Kitaev model for this cobaltate material.
Area of Science:
- Condensed Matter Physics
- Magnetism
- Quantum Materials
Background:
- Cobalt-based honeycomb magnets are explored for Kitaev spin liquid (KSL) states.
- BaCo2(AsO4)2 (BCAO) is a candidate material due to potential bond-dependent Kitaev interactions.
Purpose of the Study:
- To investigate the magnetic interactions and potential for KSL in BCAO.
- To experimentally test theoretical models describing magnetic excitations in BCAO.
Main Methods:
- Comprehensive inelastic neutron scattering (INS) study of BCAO.
- Measurements performed with applied fields in the honeycomb plane.
- Analysis combined magnon excitations in high-field and inelastic spin structure factor in zero field.
Main Results:
- Experimental data from INS are inconsistent with the Kitaev-type [Formula: see text] model.
- The observed magnetic excitations and spin structure factor are well-described by the XXZ[Formula: see text] model.
- This suggests that BCAO does not host the predicted Kitaev spin liquid state.
Conclusions:
- The XXZ[Formula: see text] model provides a consistent explanation for the magnetic behavior of BCAO.
- Results challenge the suitability of BCAO as a platform for the Kitaev spin liquid.
- Implications for realizing Kitaev physics in cobaltate materials are discussed.
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