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Article Dans Une Revue Physical Review B Année : 2020

Kitaev interactions in the Co honeycomb antiferromagnets Na3Co2SbO6 and Na2Co2TeO6

Résumé

Co 2+ ions in an octahedral crystal field stabilize a j eff = 1/2 ground state with an orbital degree of freedom and have been recently put forward for realizing Kitaev interactions, a prediction we have tested by investigating spin dynamics in two cobalt honeycomb lattice compounds, Na 2 Co 2 TeO 6 and Na 3 Co 2 SbO 6 , using inelastic neutron scattering. We used linear spin wave theory to show that the magnetic spectra can be reproduced with a spin Hamiltonian including a dominant Kitaev nearest-neighbor interaction, weaker Heisenberg interactions up to the third neighbor, and bond-dependent off-diagonal exchange interactions. Beyond the Kitaev interaction that alone would induce a quantum spin liquid state, the presence of these additional couplings is responsible for the zigzag-type long-range magnetic ordering observed at low temperature in both compounds. These results provide evidence for the realization of Kitaev-type coupling in cobalt-based materials, despite hosting a weaker spin-orbit coupling than their 4d and 5d counterparts.
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Dates et versions

hal-03377364 , version 1 (14-10-2021)

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M. Songvilay, J. Robert, S. Petit, J. A Rodriguez-Rivera, W. D Ratcliff, et al.. Kitaev interactions in the Co honeycomb antiferromagnets Na3Co2SbO6 and Na2Co2TeO6. Physical Review B, 2020, 102 (22), pp.224429. ⟨10.1103/PhysRevB.102.224429⟩. ⟨hal-03377364⟩
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