CrCl $_3$中的巨热磁导和自旋-声子散射的一般模型
Giant thermal magnetoconductivity in CrCl$_3$ and a general model for spin-phonon scattering
摘要：
绝缘量子磁体处于量子物质基础研究和日益应用的自旋电子学领域技术开发的最前沿。在这种情况下，磁热输运是一个特别敏感的探针的基本自旋和奇异的拓扑激发在非常规磁性绝缘体。然而，磁对热传导的贡献总是与晶格贡献交织在一起，因此自旋-声子耦合在决定自旋和热输运性质方面的问题在涌现拓扑磁系统中变得更加重要。在这里，我们报告的观察到的导热系数的增强，发生在所有相关的温度下，在层状蜂窝材料氯化铬$_3$在施加磁场的存在下。在低温和小磁场下，远离磁有序相，没有相干自旋对热传导的贡献，因此该效应必须由由于磁场波动引起的声子热导率的强烈抑制引起，磁场波动又被场抑制。我们建立了一个经验模型的热导率的CrCl $_3$内的形式主义假设一个独立确定的自旋翻转过程的数量和效率的声子散射事件，他们调解。通过提取内禀声子热导率，我们得到了在所有领域和温度下的定量描述，并证明了散射效率是完全独立的字段。在这种方式中，我们使用氯化铬$_3$作为一个模型系统，以了解自旋和声子激发的热输运的上下文中的相互作用。我们预计，我们介绍的完全通用的框架将有广泛的影响磁量子材料中的传输现象的解释。
英文摘要：
Insulating quantum magnets lie at the forefront both of fundamental research into quantum matter and of technological exploitation in the increasingly applied field of spintronics. In this context, the magnetic thermal transport is a particularly sensitive probe of the elementary spin and exotic topological excitations in unconventional magnetic insulators. However, magnetic contributions to heat conduction are invariably intertwined with lattice contributions, and thus the issue of spin-phonon coupling in determining the spin and thermal transport properties becomes more important with emergent topological magnetic system. Here we report the observation of an anomalously strong enhancement of the thermal conductivity, occurring at all relevant temperatures, in the layered honeycomb material CrCl$_3$ in the presence of an applied magnetic field. Away from the magnetically ordered phase at low temperatures and small fields, there is no coherent spin contribution to the heat conduction, and hence the effect must be caused by a strong suppression of the phonon thermal conductivity due to magnetic fluctuations, which are in turn suppressed by the field. We build an empirical model for the thermal conductivity of CrCl$_3$ within a formalism assuming an independently determined number of spin-flip processes and an efficiency of the phonon scattering events they mediate. By extracting the intrinsic phonon thermal conductivity we obtain a quantitative description at all fields and temperatures and demonstrate that the scattering efficiency is entirely independent of the field. In this way we use CrCl$_3$ as a model system to understand the interactions between spin and phonon excitations in the context of thermal transport. We anticipate that the completely general framework we introduce will have broad implications for the interpretation of transport phenomena in magnetic quantum materials.
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