凝聚态物理
材料科学
热电效应
热导率
热电材料
铁磁性
功勋
自旋电子学
合金
塞贝克系数
声子
热力学
冶金
光电子学
物理
复合材料
作者
Akihiro Hori,Susumu Minami,Mineo Saito,Fumiyuki Ishii
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 merit ZT of CoMnSb.
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