Ferromagnetism enhancing thermoelectric transport properties in dilute magnetic semiconductor Ge1−xMnxTe

IF 7.4 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2025-07-04 DOI:10.1007/s40843-025-3446-2

Xiaofeng Chen (, ), Ping Wei (, ), Tiantian Chen (, ), Xianfeng Ye (, ), Junjie Ge (, ), Zhixin Tang (, ), Wanting Zhu (, ), Xiaolei Nie (, ), Danqi He (, ), Mingrui Liu (, ), Wenyu Zhao (, ), Qingjie Zhang (, )

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Abstract

IV–VI dilute magnetic semiconductor Mn-doped GeTe has garnered significant attention for its promising thermoelectric (TE) properties in the mid-temperature range. However, the impact of Mn on the transport properties of GeTe remains ambiguous. This study investigates the critical role of Mn doping in optimizing the TE properties of Ge_1−xMn_xTe alloys. The transport properties, magnetic properties, and lattice vibration behavior were characterized in the temperature range of 50–300 K. It was demonstrated that the incorporation of Mn significantly reduces carrier concentration and amplifies electron scattering, thereby optimizing the power factor with a two-fold increment. Apart from the enhanced alloy scattering, Mn doping causes the softening of optical phonons and reduced phonon group velocity, therefore, a remarkable suppression in lattice thermal conductivity. Furthermore, the ferromagnetism of Mn contributes to the TE performance of Ge_1−xMn_xTe as it benefits from the depressed phonon modes of magnetic excitation. This work provides a strategic insight into optimizing TE performance for advancing GeTe-based dilute magnetic semiconductors.

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增强稀磁性半导体Ge1−xMnxTe热电输运性质的铁磁性

IV-VI稀磁半导体锰掺杂GeTe因其在中温范围内具有良好的热电性能而受到广泛关注。然而，Mn对GeTe输运性质的影响仍然不清楚。本研究探讨了Mn掺杂在优化Ge1−xMnxTe合金TE性能中的关键作用。在50 ~ 300 K的温度范围内，对其输运性质、磁性和晶格振动行为进行了表征。结果表明，Mn的加入显著降低了载流子浓度，放大了电子散射，从而使功率因数提高了两倍。除了增强合金散射外，Mn掺杂引起光学声子的软化和声子群速度的降低，从而显著抑制晶格热导率。此外，Mn的铁磁性有助于Ge1−xMnxTe的TE性能，因为它受益于磁激发的抑制声子模式。这项工作为优化TE性能，推进基于gete的稀磁半导体提供了战略见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.