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arXiv 2405.13628cond-mat.str-elcond-mat.mtrl-sci
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新型Shastry-Sutherland晶格磁体Pr$_2$Ga$_2$BeO$_7$中的自旋子

Spinons in a new Shastry-Sutherland lattice magnet Pr$_2$Ga$_2$BeO$_7$

N. Li, A. Brassington, M. F. Shu, Y. Y. Wang, H. Liang, Q. J. Li, X. Zhao, P. J. Baker, H. Kikuchi, T. Masuda, G. Duan, C. Liu, H. Wang, W. Xie, R. Zhong, J. Ma… 展开作者

N. Li, A. Brassington, M. F. Shu, Y. Y. Wang, H. Liang, Q. J. Li, X. Zhao, P. J. Baker, H. Kikuchi, T. Masuda, G. Duan, C. Liu, H. Wang, W. Xie, R. Zhong, J. Ma, R. Yu, H. D. Zhou, X. F. Sun

AI总结:

本研究在新型Shastry-Sutherland晶格磁体Pr$_2$Ga$_2$BeO$_7$中观测到迄今最大的$κ_0/T$值,结合多种实验证据确认其量子自旋液体性质,并揭示XY自旋各向异性是实现该晶格首个QSL的关键。

摘要:

在量子自旋液体(QSL)材料中识别 elusive 的自旋子激发是科学家长期追求的目标。近年来,热导率($κ$)已成为一种决定性的探测手段,因为自旋子的费米子特性导致在接近零开尔文时出现特征性的非零线性 $κ_0/T$ 项。迄今为止,仅有少数系统被报道表现出这一项。在此,我们报告在具有Shastry-Sutherland晶格(SSL)的新型量子磁体Pr$_2$Ga$_2$BeO$_7$中观测到 $κ_0/T \approx$ 0.01 WK$^{-2}$m$^{-1}$,这是磁性氧化物QSL候选材料中迄今观测到的最大 $κ_0/T$ 值。其QSL性质进一步得到比热的幂律温度依赖、μ子自旋弛豫率的平台以及无间隙非弹性中子谱的支持。我们的理论分析揭示,引入XY自旋各向异性是Pr$_2$Ga$_2$BeO$_7$成为SSL上首个QSL的关键,此前对这一著名磁阻挫晶格已进行了超过四十年的广泛研究。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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