关联FeSb $_{2-x}$ Te $_x$中超导体-金属转变时不变的热电势增强
Unchanged thermopower enhancement at the semiconductor-metal transition in correlated FeSb$_{2-x}$Te$_x$
摘要：
用小于0.5%的Te取代FeSb $_2$中的Sb会引起从相关半导体到具有大有效载流子质量$m^*$的非常规金属的转变。跨越整个范围的超导体-金属交叉，我们观察到几乎恒定的增强测量的热电势相比，由经典理论的电子扩散估计。使用后者进行定量描述，必须使用10-30的增强因子。我们的观察点的重要性，电子-电子的相关性的热传输的FeSb $_2$，并建议一条路线，设计热电材料的低温应用。
英文摘要：
Substitution of Sb in FeSb$_2$ by less than 0.5% of Te induces a transition from a correlated semiconductor to an unconventional metal with large effective charge carrier mass $m^*$. Spanning the entire range of the semiconductor-metal crossover, we observed an almost constant enhancement of the measured thermopower compared to that estimated by the classical theory of electron diffusion. Using the latter for a quantitative description one has to employ an enhancement factor of 10-30. Our observations point to the importance of electron-electron correlations in the thermal transport of FeSb$_2$, and suggest a route to design thermoelectric materials for cryogenic applications.
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