同时优化Ce（Ni $_{1-x}$ Cu $_x$）$_2$ Al $_3$的热电参数
Simultaneously optimizing the interdependent thermoelectric parameters in Ce(Ni$_{1-x}$Cu$_x$)$_2$Al$_3$
摘要：
在近藤晶格体系CeNi $_2$ Al $_3$中用Cu取代Ni，同时优化了三个相互依赖的热电参数：热电功率、电导率和热导率，其中Cu的额外电子引起的导带电子变化是至关重要的.所获得的热电优值$zT$在100 K左右为0.125，与近藤化合物已知的最佳值相当。在Ce（Ni $_{1-x}$ Cu $_x$）$_2$ Al $_3$中实现了理想的热电优化，表明适当的近藤化合物的电子调谐是一种很有前途的低温应用高效热电材料。
英文摘要：
Substitution of Cu for Ni in the Kondo lattice system CeNi$_2$Al$_3$ results in a simultaneous optimization of the three interdependent thermoelectric parameters: thermoelectric power, electrical and thermal conductivities, where the electronic change in conduction band induced by the extra electron of Cu is shown to be crucial. The obtained thermoelectric figure of merit $zT$ amounts to 0.125 at around 100 K, comparable to the best values known for Kondo compounds. The realization of ideal thermoelectric optimization in Ce(Ni$_{1-x}$Cu$_x$)$_2$Al$_3$ indicates that proper electronic tuning of Kondo compounds is a promising approach to efficient thermoelectric materials for cryogenic application.
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