Enhanced anomalous Nernst effect in Pr-doped kagome and honeycomb magnet LaCo${}_5$

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 $S_{yx}^A$ reaches 6.5~$\mu \mathrm{V}\mathrm{/}\mathrm{K}$ 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.