Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Kitaev Interactions in the Co Honeycomb Antiferromagnets Na3Co2SbO6 and Na2Co2TeO6

Published

Author(s)

M. Songvilay, J. Robert, Jose Rodriguez Rivera, William D. Ratcliff, F. Damay, V. Baledent, M. Jimenez-Ruiz, P. Lejay, E. Pachoud, A. Hadj-Azzem, V. Simonet, C. Stock

Abstract

Co2+ ions in an octahedral crystal field, stabilize a jeff = 1⁄2 ground state with an orbital degree of freedom and and have been recently put forward for realising Kitaev interactions, a prediction that we have tested by investigating spin dynamics in two cobalt honeycomb lattice compounds, Na2Co2TeO6 and Na3Co2SbO6, using inelastic neutron scattering. The measurements were performed on polycrystalline samples and modeled using linear spin wave theory. Our results show that the magnetic excitations of these compounds 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.
Citation
Physical Review B
Volume
102
Issue
22

Keywords

Kitaev, neutron

Citation

Songvilay, M. , Robert, J. , Rodriguez, J. , Ratcliff, W. , Damay, F. , Baledent, V. , Jimenez-Ruiz, M. , Lejay, P. , Pachoud, E. , Hadj-Azzem, A. , Simonet, V. and Stock, C. (2020), Kitaev Interactions in the Co Honeycomb Antiferromagnets Na<sub>3</sub>Co<sub>2</sub>SbO<sub>6</sub> and Na<sub>2</sub>Co<sub>2</sub>TeO<sub>6</sub>, Physical Review B (Accessed May 26, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created December 23, 2020, Updated September 7, 2021