Thermodynamics and heat transport of quantum spin liquid candidates NaYbS$_2$ and NaYbSe$_2$
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Li, N. Xie, M. T. Huang, Q. Zhuo, Z. W. Zhang, Z. Choi, E. S. Wang, Y. Y. Liang, H. Sun, Y. Wu, D. D. Li, Q. J. Zhou, H. D. Chen, G. Zhao, X. Zhang, Q. M. Sun, X. F. |
| author_facet | Li, N. Xie, M. T. Huang, Q. Zhuo, Z. W. Zhang, Z. Choi, E. S. Wang, Y. Y. Liang, H. Sun, Y. Wu, D. D. Li, Q. J. Zhou, H. D. Chen, G. Zhao, X. Zhang, Q. M. Sun, X. F. |
| contents | We study the ultralow-temperature thermodynamics and thermal conductivity ($κ$) of the single-crystal rare-earth chalcogenides NaYbS$_2$ and NaYbSe$_2$, which have an ideal triangular lattice of the Yb$^{3+}$ ions and have been proposed to be quantum spin liquid candidates. The magnetic specific heat divided by temperature $C_{\rm{mag}}/T$ is nearly constant at $T <$ 200 mK, which is indeed the indication of the gapless magnetic excitations with a constant density of states. However, we observe a vanishingly small residual term $κ_0/T$, which points to the absence of mobile fermionic excitations in these materials. Both the weak temperature dependence of $κ$ and the strong magnetic-field dependence of $κ$ suggest the significant scattering between the spinons and phonons, which actually supports the existence of gapless or tiny-gapped quantum spin liquid. Moreover, the $κ(B)/κ(0)$ isotherms show a series of field-induced magnetic transitions for $B \parallel a$, confirming the easy-plane anisotropy, which is consistent with the results of ac magnetic susceptibility. We expect our results to inspire further interests in the understanding of the spinon-phonon coupling in the spin liquid systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_11092 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thermodynamics and heat transport of quantum spin liquid candidates NaYbS$_2$ and NaYbSe$_2$ Li, N. Xie, M. T. Huang, Q. Zhuo, Z. W. Zhang, Z. Choi, E. S. Wang, Y. Y. Liang, H. Sun, Y. Wu, D. D. Li, Q. J. Zhou, H. D. Chen, G. Zhao, X. Zhang, Q. M. Sun, X. F. Strongly Correlated Electrons Materials Science We study the ultralow-temperature thermodynamics and thermal conductivity ($κ$) of the single-crystal rare-earth chalcogenides NaYbS$_2$ and NaYbSe$_2$, which have an ideal triangular lattice of the Yb$^{3+}$ ions and have been proposed to be quantum spin liquid candidates. The magnetic specific heat divided by temperature $C_{\rm{mag}}/T$ is nearly constant at $T <$ 200 mK, which is indeed the indication of the gapless magnetic excitations with a constant density of states. However, we observe a vanishingly small residual term $κ_0/T$, which points to the absence of mobile fermionic excitations in these materials. Both the weak temperature dependence of $κ$ and the strong magnetic-field dependence of $κ$ suggest the significant scattering between the spinons and phonons, which actually supports the existence of gapless or tiny-gapped quantum spin liquid. Moreover, the $κ(B)/κ(0)$ isotherms show a series of field-induced magnetic transitions for $B \parallel a$, confirming the easy-plane anisotropy, which is consistent with the results of ac magnetic susceptibility. We expect our results to inspire further interests in the understanding of the spinon-phonon coupling in the spin liquid systems. |
| title | Thermodynamics and heat transport of quantum spin liquid candidates NaYbS$_2$ and NaYbSe$_2$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2412.11092 |