Pr掺杂的kagome和honeycomb磁体LaCo$_5$中增强的反常能斯特效应
Enhanced anomalous Nernst effect in Pr-doped kagome and honeycomb magnet LaCo$_5$
- School of Physics, Zhejiang University（浙江大学物理学院）
- School of Physics and Optical Engineering, Zhejiang University of Technology（浙江工业大学物理与光电工程学院）
- State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University（浙江大学硅及先进半导体材料国家重点实验室）
- Hefei National Laboratory（合肥国家实验室）
- Wuhan National High Magnetic Field Center, Huazhong University of Science & Technology（华中科技大学武汉国家高磁场科学中心）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
本研究通过Pr掺杂LaCo$_5$单晶，在300 K下将反常能斯特热电功率提升约40%至6.5 μV/K，归因于费米能级修正导致的贝里曲率重分布，为室温能量收集和热传感材料设计提供策略。
中文摘要 AI 辅助
在本工作中，我们报道了La$_{1-x}$Pr$_x$Co$_5$（$x = 0.09, 0.21, 0.45$）单晶的成功合成。磁场依赖的磁化测量表明，Pr替代对LaCo$_5$的磁性质引起可忽略的变化，铁磁有序主要由Co亚晶格主导。值得注意的是，掺杂体系表现出反常能斯特效应的显著增强。在300 K下，La$_{0.55}$Pr$_{0.45}$Co$_5$中的反常能斯特热电功率$S^A_{yx}$达到6.5~$\mathrm{\mu V/K}$，相比母体化合物对应约40%的增强。这一显著改进主要归因于Pr掺杂诱导的费米能级修正，这直接导致贝里曲率在费米面上的重新分布。本工作凸显了Pr掺杂在增强La$_{1-x}$Pr$_x$Co$_5$反常能斯特效应方面的有效性，为设计用于室温能量收集技术和高效热传感设备的先进材料提供了一种实用策略。
英文摘要
In this work, we report the successful synthesis of La$_{1-x}$Pr$_x$Co$_5$ ($x = 0.09, 0.21, 0.45$) single crystals. Magnetic field-dependent magnetization measurements reveal that Pr substitution induces negligible changes in the magnetic properties of LaCo$_5$, with the ferromagnetic ordering predominantly governed by the Co sublattices. Remarkably, the doped systems exhibit significant enhancements in the anomalous Nernst effect. At 300~K, the anomalous Nernst thermopower $S^A_{yx}$ reaches 6.5~$\mathrm{μV/K}$ in La$_{0.55}$Pr$_{0.45}$Co$_5$, corresponding to a $\sim$ 40 \% enhancement compared to the parent compound. This significant improvement can be predominantly attributed to Pr-doping-induced Fermi level modification, which directly leads to a redistribution of Berry curvature across the Fermi surface. This work highlights the effectiveness of Pr doping in boosting the anomalous Nernst effect of La$_{1-x}$Pr$_x$Co$_5$, offering a practical strategy to design advanced materials for room-temperature energy-harvesting technologies and high-efficiency thermal sensing devices.
