%0 Journal Article %1 PhysRevLett.131.146702 %A Krüger, Wilhelm G. F. %A Chen, Wenjie %A Jin, Xianghong %A Li, Yuan %A Janssen, Lukas %D 2023 %I American Physical Society %J Phys. Rev. Lett. %K a %N 14 %P 146702 %R 10.1103/PhysRevLett.131.146702 %T Triple-q order in Na$_2$Co$_2$TeO$_6$ from proximity to hidden-SU(2)-symmetric point %U https://link.aps.org/doi/10.1103/PhysRevLett.131.146702 %V 131 %X In extended Heisenberg-Kitaev-Gamma-type spin models, hidden-SU(2)-symmetric points are isolated points in parameter space that can be mapped to pure Heisenberg models via nontrivial duality transformations. Such points generically feature quantum degeneracy between conventional single-q and exotic multi-q states. We argue that recent single-crystal inelastic neutron scattering data place the honeycomb magnet Na2Co2TeO6 in proximity to such a hidden-SU(2)-symmetric point. The low-temperature order is identified as a triple-q state arising from the Néel antiferromagnet with staggered magnetization in the out-of-plane direction via a 4-sublattice duality transformation. This state naturally explains various distinctive features of the magnetic excitation spectrum, including its surprisingly high symmetry and the dispersive low-energy and flat high-energy bands. Our result demonstrates the importance of bond-dependent exchange interactions in cobaltates, and illustrates the intriguing magnetic behavior resulting from them.

@article{PhysRevLett.131.146702, abstract = {In extended Heisenberg-Kitaev-Gamma-type spin models, hidden-SU(2)-symmetric points are isolated points in parameter space that can be mapped to pure Heisenberg models via nontrivial duality transformations. Such points generically feature quantum degeneracy between conventional single-q and exotic multi-q states. We argue that recent single-crystal inelastic neutron scattering data place the honeycomb magnet Na2Co2TeO6 in proximity to such a hidden-SU(2)-symmetric point. The low-temperature order is identified as a triple-q state arising from the Néel antiferromagnet with staggered magnetization in the out-of-plane direction via a 4-sublattice duality transformation. This state naturally explains various distinctive features of the magnetic excitation spectrum, including its surprisingly high symmetry and the dispersive low-energy and flat high-energy bands. Our result demonstrates the importance of bond-dependent exchange interactions in cobaltates, and illustrates the intriguing magnetic behavior resulting from them.}, added-at = {2023-10-06T13:42:07.000+0200}, author = {Krüger, Wilhelm G. F. and Chen, Wenjie and Jin, Xianghong and Li, Yuan and Janssen, Lukas}, biburl = {https://www.bibsonomy.org/bibtex/2b269561c35181936865a2db1293af478/ctqmat}, day = 5, description = {Phys. Rev. Lett. 131, 146702 (2023) - Triple-q Order in ${\mathrm{Na}}_{2}{\mathrm{Co}}_{2}{\mathrm{TeO}}_{6}$ from Proximity to Hidden-SU(2)-Symmetric Point}, doi = {10.1103/PhysRevLett.131.146702}, interhash = {436bf08f5c4bb740a6afabcb26715874}, intrahash = {b269561c35181936865a2db1293af478}, journal = {Phys. Rev. Lett.}, keywords = {a}, month = {10}, number = 14, numpages = {8}, pages = 146702, publisher = {American Physical Society}, timestamp = {2023-10-31T10:50:27.000+0100}, title = {Triple-q order in Na$_{\mathbf{2}}$Co$_{\mathbf{2}}$TeO$_{\mathbf{6}}$ from proximity to hidden-SU(2)-symmetric point}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.131.146702}, volume = 131, year = 2023 }