Understanding and design of spin-driven thermoelectrics
Understanding and design of spin-driven thermoelectrics
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DOI：
10.1016/j.xcrp.2021.100614
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发表时间：
2021-11-17
影响因子：
8.9
通讯作者：
Vashaee, Daryoosh
中科院分区：
文献类型：
--
作者：
Polash, Md Mobarak Hossain;Moseley, Duncan;Vashaee, Daryoosh
虽然基于电子和声子特性工程的热电材料的进展正在达到一个平台，但自旋自由度的增加有可能为替代热电材料开辟一个新的前景。在这里，我们提出的概念，目前的理解，和设计自旋驱动热电的指导方针。我们表明，自旋和热流之间的相互作用，通过载流子的熵输运可以提供一个路径，以提高电子的热电势。经典的反铁磁半导体碲化锰（MnTe）被选为案例研究，由于其显着的自旋介导的热电性能。我们表明，虽然自旋无序散射降低了磁性材料中的载流子迁移率，自旋熵，磁振子，顺磁振子载流子阻力可以占主导地位，并显着提高热电功率因数，因此zT。最后，根据目前的理解，设计高性能的自旋驱动热电材料的几个指导方针。
While progress in thermoelectric materials based on the engineering of electronic and phononic characteristics is reaching a plateau, the addition of the spin degree of freedom has the potential to open a new landscape for alternative thermoelectric materials. Here, we present the concepts, current understanding, and guidelines for designing spin-driven thermoelectrics. We show that the interplay between the spin and heat currents in entropy transport via charge carriers can offer a path to enhance the electronic thermopower. The classical antiferromagnetic semiconductor manganese telluride (MnTe) is chosen as the case study due to its significant spin-mediated thermoelectric properties. We showthat, although the spin-disorder scattering reduces the carrier mobility in magnetic materials, spin entropy, magnon, and paramagnon carrier drags can dominate and significantly enhance the thermoelectric power factor, and hence zT. Finally, several guidelines are drawn based on the current understanding for designing high-performance spin-driven thermoelectric materials.