Spinons in a new Shastry-Sutherland lattice magnet Pr$_2$Ga$_2$BeO$_7$
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Li, N. Brassington, A. Shu, M. F. Wang, Y. Y. Liang, H. Li, Q. J. Zhao, X. Baker, P. J. Kikuchi, H. Masuda, T. Duan, G. Liu, C. Wang, H. Xie, W. Zhong, R. Ma, J. Yu, R. Zhou, H. D. Sun, X. F. |
| author_facet | Li, N. Brassington, A. Shu, M. F. Wang, Y. Y. Liang, H. Li, Q. J. Zhao, X. Baker, P. J. Kikuchi, H. Masuda, T. Duan, G. Liu, C. Wang, H. Xie, W. Zhong, R. Ma, J. Yu, R. Zhou, H. D. Sun, X. F. |
| contents | Identifying the elusive spinon excitations in quantum spin liquid (QSL) materials is what scientists have long sought for. Recently, thermal conductivity ($κ$) has emerged to be a decisive probe because the fermionic nature of spinons leads to a characteristic nonzero linear $κ_0/T$ term while approaching zero Kelvin. So far, only a few systems have been reported to exhibit such term. Here, we report a $κ_0/T \approx$ 0.01 WK$^{-2}$m$^{-1}$, the largest $κ_0/T$ value ever observed in magnetic oxide QSL candidates, in a new quantum magnet Pr$_2$Ga$_2$BeO$_7$ with a Shastry-Sutherland lattice (SSL). Its QSL nature is further supported by the power-law temperature dependence of the specific heat, a plateau of muon spin relaxation rate, and gapless inelastic neutron spectra. Our theoretical analysis reveals that the introduction of XY spin anisotropy is the key for Pr$_2$Ga$_2$BeO$_7$ to be the first QSL realized on the SSL, after more than four decades of extensive studies on this celebrated magnetically frustrated lattice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_13628 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spinons in a new Shastry-Sutherland lattice magnet Pr$_2$Ga$_2$BeO$_7$ Li, N. Brassington, A. Shu, M. F. Wang, Y. Y. Liang, H. Li, Q. J. Zhao, X. Baker, P. J. Kikuchi, H. Masuda, T. Duan, G. Liu, C. Wang, H. Xie, W. Zhong, R. Ma, J. Yu, R. Zhou, H. D. Sun, X. F. Strongly Correlated Electrons Materials Science Identifying the elusive spinon excitations in quantum spin liquid (QSL) materials is what scientists have long sought for. Recently, thermal conductivity ($κ$) has emerged to be a decisive probe because the fermionic nature of spinons leads to a characteristic nonzero linear $κ_0/T$ term while approaching zero Kelvin. So far, only a few systems have been reported to exhibit such term. Here, we report a $κ_0/T \approx$ 0.01 WK$^{-2}$m$^{-1}$, the largest $κ_0/T$ value ever observed in magnetic oxide QSL candidates, in a new quantum magnet Pr$_2$Ga$_2$BeO$_7$ with a Shastry-Sutherland lattice (SSL). Its QSL nature is further supported by the power-law temperature dependence of the specific heat, a plateau of muon spin relaxation rate, and gapless inelastic neutron spectra. Our theoretical analysis reveals that the introduction of XY spin anisotropy is the key for Pr$_2$Ga$_2$BeO$_7$ to be the first QSL realized on the SSL, after more than four decades of extensive studies on this celebrated magnetically frustrated lattice. |
| title | Spinons in a new Shastry-Sutherland lattice magnet Pr$_2$Ga$_2$BeO$_7$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2405.13628 |