| Autor: |
Hong, Xiaochen, Gillig, Matthias, Hentrich, Richard, Yao, Weiliang, Kocsis, Vilmos, Witte, Arthur R., Schreiner, Tino, Baumann, Danny, Pérez, Nicolás, Wolter, Anja U. B., Li, Yuan, Büchner, Bernd, Hess, Christian |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B 104, 144426 (2021) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.104.144426 |
| Popis: |
We studied the field dependent thermal conductivity ($\kappa$) of Na$_2$Co$_2$TeO$_6$, a compound considered as the manifestation of the Kitaev model based on the high-spin $d^7$ Co$^{2+}$ ions. We found that in-plane magnetic fields beyond a critical value $B_c \approx$~10 T are able to drastically enhance $\kappa$ at low temperatures, resulting in a double-peak structure of $\kappa(T)$ that closely resembles the behavior of $\alpha$-RuCl$_3$. This result suggests that heat transport in Na$_2$Co$_2$TeO$_6$ 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 $B\leq B_c\approx10$ T and the partially spin-polarized gapped high-field phase for $B\gtrsim 12$ T. 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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