First-principles calculation of lattice thermal conductivity and thermoelectric figure of merit in ferromagnetic half-Heusler alloy CoMnSb

被引：25

作者：

Hori, Akihiro ^{[1
]}

Minami, Susumu ^{[1
]}

Saito, Mineo ^{[2
]}

Ishii, Fumiyuki ^{[1
]}

机构：

[1] Kanazawa Univ, Nanomat Res Inst, Kanazawa, Ishikawa 9201192, Japan

[2] Kanazawa Univ, Inst Sci & Engn, Fac Math & Phys, Kanazawa, Ishikawa 9201192, Japan

来源：

APPLIED PHYSICS LETTERS | 2020年 / 116卷 / 24期

基金：

日本学术振兴会;

关键词：

Thermal conductivity - Thermoelectric equipment - Crystal lattices - Thermoelectricity - Calculations - Cobalt alloys;

D O I：

10.1063/1.5143038

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Half-Heusler (HH) alloys are an important and well-studied class of thermoelectric, magnetic, and spintronic materials. However, few studies have reported on thermal conductivity of magnetic HH alloys. In this study, we have performed first-principles calculation of the thermoelectric properties of a magnetic HH alloy CoMnSb. The lattice thermal conductivity of CoMnSb was found to be smaller than typical nonmagnetic HH alloys (CoTiSb, CoZrSb). The reason for this was found to be the small group velocity and relaxation time of acoustic phonons. Moreover, we estimated the electronic thermal conductivity and power factor, and finally, we evaluated the thermoelectric figure of meritZTof CoMnSb.

引用

页数：5