%0 Journal Article %1 PhysRevB.104.144426 %A Hong, Xiaochen %A Gillig, Matthias %A Hentrich, Richard %A Yao, Weiliang %A Kocsis, Vilmos %A Witte, Arthur R. %A Schreiner, Tino %A Baumann, Danny %A Pérez, Nicolás %A Wolter, Anja U. B. %A Li, Yuan %A Büchner, Bernd %A Hess, Christian %D 2021 %I American Physical Society %J Phys. Rev. B %K b c %N 14 %P 144426 %R 10.1103/PhysRevB.104.144426 %T Strongly scattered phonon heat transport of the candidate Kitaev material Na$_2$Co$_2$TeO$_6$ %U https://link.aps.org/doi/10.1103/PhysRevB.104.144426 %V 104 %X We studied the field-dependent thermal conductivity (κ) of Na2Co2TeO6, a compound considered as the manifestation of the Kitaev model based on the high-spin d7 Co2+ ions. We found that in-plane magnetic fields beyond a critical value Bc≈10T are able to drastically enhance κ at low temperatures, resulting in a double-peak structure of κ(T) that closely resembles the behavior of α−RuCl3. This result suggests that heat transport in Na2Co2TeO6 is primarily phononic, and it is strongly affected by scattering from magnetic excitations that are highly tunable by external fields. Interestingly, for magnetic fields B∥a (i.e., along the zigzag direction of the Co-Co bonds), there is an extended field range which separates the long-range magnetic order for B≤Bc≈10T and the partially spin-polarized gapped high-field phase for B≳12T. The low-energy phonon scattering is particularly strong in this field range, consistent with the notion that the system becomes a quantum spin liquid with prominent spin fluctuations down to energies of no more than 2 meV.

@article{PhysRevB.104.144426, abstract = {We studied the field-dependent thermal conductivity (κ) of Na2Co2TeO6, a compound considered as the manifestation of the Kitaev model based on the high-spin d7 Co2+ ions. We found that in-plane magnetic fields beyond a critical value Bc≈10T are able to drastically enhance κ at low temperatures, resulting in a double-peak structure of κ(T) that closely resembles the behavior of α−RuCl3. This result suggests that heat transport in Na2Co2TeO6 is primarily phononic, and it is strongly affected by scattering from magnetic excitations that are highly tunable by external fields. Interestingly, for magnetic fields B∥a (i.e., along the zigzag direction of the Co-Co bonds), there is an extended field range which separates the long-range magnetic order for B≤Bc≈10T and the partially spin-polarized gapped high-field phase for B≳12T. The low-energy phonon scattering is particularly strong in this field range, consistent with the notion that the system becomes a quantum spin liquid with prominent spin fluctuations down to energies of no more than 2 meV.}, added-at = {2023-11-16T18:59:58.000+0100}, author = {Hong, Xiaochen and Gillig, Matthias and Hentrich, Richard and Yao, Weiliang and Kocsis, Vilmos and Witte, Arthur R. and Schreiner, Tino and Baumann, Danny and P\'erez, Nicol\'as and Wolter, Anja U. B. and Li, Yuan and B\"uchner, Bernd and Hess, Christian}, biburl = {https://www.bibsonomy.org/bibtex/208c5fd9d0f63158c753068249baee63b/ctqmat}, day = 28, doi = {10.1103/PhysRevB.104.144426}, interhash = {58377215e5cc45819b68537a2051849d}, intrahash = {08c5fd9d0f63158c753068249baee63b}, journal = {Phys. Rev. B}, keywords = {b c}, month = {11}, number = 14, numpages = {7}, pages = 144426, publisher = {American Physical Society}, timestamp = {2023-11-16T18:59:58.000+0100}, title = {Strongly scattered phonon heat transport of the candidate Kitaev material Na$_{\mathbf{2}}$Co$_{\mathbf{2}}$TeO$_{\mathbf{6}}$}, url = {https://link.aps.org/doi/10.1103/PhysRevB.104.144426}, volume = 104, year = 2021 }