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arXiv 2408.00873cond-mat.str-elcond-mat.mtrl-sci
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蜂窝状反铁磁体 BaCo2(AsO4)2 中热导率的标度行为与巨场增强

Scaling behavior and giant field-enhancement of the thermal conductivity in the honeycomb antiferromagnet BaCo2(AsO4)2

Jiayi Hu, Ruidan Zhong, Peter Czajka, Tong Gao, R. J Cava, N. P. Ong

AI总结:

本文发现蜂窝反铁磁体 BaCo2(AsO4)2 在磁无序区域中热导率随面内磁场出现约211倍的巨增强,并揭示其满足单参数标度函数 exp(-1/gx),为理解磁激发与声子耦合提供了新视角。

摘要:

层状蜂窝材料 BaCo$_2$(AsO$_4$)$_2$(BCAO)因其磁态与 Kitaev 磁体 $α$-RuCl$_3$ 相关而受到关注。我们利用热输运探测磁无序区域中磁激发与声子的相互作用,发现在面内磁场 ${\bf H}$ 中热导率 $κ_{xx}$ 出现异常巨大的增强。在 Néel 温度 $T_{\rm N}$ 之上,13 T 的磁场使 $κ_{xx}$ 增大约 $\sim 211$ 倍,远大于此前在任何磁性绝缘体中报道的数值。有趣的是,$κ_{xx}(H,T)$ 在包围有序 zigzag 态的整个磁无序区域中表现出标度行为。在整个无序区域测得的比值 $Δκ_{xx}(H,T)/κ_{xx}(13,T)$ 坍缩为一个单参数标度函数 ${\rm exp}(-1/gx)$(其中 $x = μ_{\rm B}B/k_{\rm B}T$,$g$ 为常数)。

英文摘要:

The layered honeycomb material BaCo$_2$(AsO$_4$)$_2$ (BCAO) is of topical interest because its magnetic state is related to that of the Kitaev magnet $α$-RuCl$_3$. Using thermal transport to probe how magnetic excitations interact with phonons in the magnetically disordered regime, we have uncovered an unusually large enhancement of the thermal conductivity $κ_{xx}$ in an in-plane magnetic field ${\bf H}$. Just above the Néel temperature $T_{\rm N}$, a field of 13 T increases $κ_{xx}$ by a factor $\sim 211$, much larger than reported previously in any magnetic insulator. Interestingly, $κ_{xx}(H,T)$ exhibits a scaling behavior in the entire magnetically disordered region that surrounds the ordered zigzag state. The ratio $Δκ_{xx}(H,T)/κ_{xx}(13,T)$, measured throughout the disordered region, collapses to a one-parameter scaling function ${\rm exp}(-1/gx)$ (where $x = μ_{\rm B}B/k_{\rm B}T$ and $g$ is a constant).

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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