论文标题
Co $ _ {1-X} $ M $ _X $ SI（M = Fe，Ni）合金的低温热电导率
Low-temperature thermal conductivity of Co$_{1-x}$M$_x$Si (M=Fe, Ni) alloys
论文作者
论文摘要
我们研究COSI和CO $ _ {1-X} $ M $ _X $ SI ALLOYS的低温电导率和热导率（M = Fe，Ni; $ x \ leq $ 0.06）。测量表明，与纯COSI相比，通过$ x> 0.01 $ x> $ 0.01的co $ _ {1-x} $ fe $ _ {1-x} $ fe $ _ {x} $ si Alloys的低温电导率下降。可以预期，合金的晶格和电子贡献都会降低。但是，我们的实验结果表明，在低于20K的温度下，含有Fe和Ni的合金的热导率比纯COSI的温度大几倍。我们讨论了导热率增强的可能机制。最可能的是与电荷载体对声子的主要散射有关。我们提出了一个简单的理论模型，该模型考虑了COSI的复杂半金属电子结构，并表明它很好地解释了晶状体导热率的增加，并增加了CO $ _ {1-X} $ fe $ _x $ _X $ _X $ _X $ si Alloys a co $ _ {1-x} $ _x $ _x $ _x $ _x $ si Alloys a co $ _ {1- x} $ _x $ _x $ si alloys after and the Termal温度的依赖性。
We study the low-temperature electrical and thermal conductivity of CoSi and Co$_{1-x}$M$_x$Si alloys (M = Fe, Ni; $x \leq$ 0.06). Measurements show that the low-temperature electrical conductivity of Co$_{1-x}$Fe$_{x}$Si alloys decreases at $x > $ 0.01 by an order of magnitude compared with that of pure CoSi. It was expected that both the lattice and electronic contributions to thermal conductivity would decrease in the alloys. However, our experimental results revealed that at temperatures below 20K the thermal conductivity of Fe- and Ni-containing alloys is several times larger than that of pure CoSi. We discuss possible mechanisms of the thermal conductivity enhancement. The most probable one is related to the dominant scattering of phonons by charge carriers. We propose a simple theoretical model that takes into account the complex semimetallic electronic structure of CoSi with nonequivalent valleys, and show that it explains well the increase of the lattice thermal conductivity with increasing disorder and the linear temperature dependence of the thermal conductivity in the Co$_{1-x}$Fe$_x$Si alloys below 20K.
