标题： RuSe$_2$的增强热电功率和电子关联性 显示英文标题

标题： Enhanced Thermoelectric Power and Electronic Correlations in RuSe$_2$

摘要： 我们报告了Ru$_{1-x}$Ir$_{x}$Se$_2$ ($x \leq 0.2$)的电子结构、电和热输运性质。 RuSe$_2$是一种在立方黄铁矿晶胞中结晶的半导体。 RuSe$_2$在约730 K时的塞贝克系数超过-200 $\mu$V/K。铱的替代导致电阻率和塞贝克系数的抑制，这表明费米能级附近的态密度峰被移除了。 Ru$_{0.8}$Ir$_{0.2}$Se$_{2}$在约30 K时显示出半导体-金属转变。磁场恢复了半导体行为。 我们的结果表明电子关联在增强RuSb$_{2}$的热电性能中的重要性。 显示英文摘要

摘要： We report the electronic structure, electric and thermal transport properties of Ru$_{1-x}$Ir$_{x}$Se$_2$ ($x \leq 0.2$). RuSe$_2$ is a semiconductor that crystallizes in a cubic pyrite unit cell. The Seebeck coefficient of RuSe$_2$ exceeds -200 $\mu$V/K around 730 K. Ir substitution results in the suppression of the resistivity and the Seebeck coefficient, suggesting the removal of the peaks in density of states near the Fermi level. Ru$_{0.8}$Ir$_{0.2}$Se$_{2}$ shows a semiconductor-metal crossover at about 30 K. The magnetic field restores the semiconducting behavior. Our results indicate the importance of the electronic correlations in enhanced thermoelectricity of RuSb$_{2}$.