Anomalous Thermopower and High ZT in GeMnTe2 Driven by Spin's Thermodynamic Entropy
文献类型：期刊论文
| 作者 | Duan, Sichen; Yin, Yinong; Liu, Guo-Qiang; Man, Na; Cai, Jianfeng; Tan, Xiaojian; Guo, Kai; Yang, Xinxin; Jiang, Jun |
| 刊名 | RESEARCH
 |
| 出版日期 | 2021 |
| 卷号 | 2021 |
| 关键词 | HIGH THERMOELECTRIC FIGURE THERMAL-CONDUCTIVITY MAGNON-DRAG WASTE HEAT POWER GETE EFFICIENCY MERIT SNTE |
| 英文摘要 | NaxCoO2 was known 20 years ago as a unique example in which spin entropy dominates the thermoelectric behavior. Hitherto, however, little has been learned about how to manipulate the spin degree of freedom in thermoelectrics. Here, we report the enhanced thermoelectric performance of GeMnTe2 by controlling the spin's thermodynamic entropy. The anomalously large thermopower of GeMnTe2 is demonstrated to originate from the disordering of spin orientation under finite temperature. Based on the careful analysis of Heisenberg model, it is indicated that the spin-system entropy can be tuned by modifying the hybridization between Te-p and Mn-d orbitals. As a consequent strategy, Se doping enlarges the thermopower effectively, while neither carrier concentration nor band gap is affected. The measurement of magnetic susceptibility provides a solid evidence for the inherent relationship between the spin's thermodynamic entropy and thermopower. By further introducing Bi doing, the maximum ZT in Ge0.94Bi0.06MnTe1.94Se0.06 reaches 1.4 at 840 K, which is 45% higher than the previous report of Bi-doped GeMnTe2. This work reveals the high thermoelectric performance of GeMnTe2 and also provides an insightful understanding of the spin degree of freedom in thermoelectrics. |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/22105]  |
| 专题 | 中国科学院宁波材料技术与工程研究所 2021专题_期刊论文 |
| 作者单位 | 1.Liu, GQ 2.Jiang, J (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China. 3.Jiang, J (corresponding author), Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Duan, Sichen,Yin, Yinong,Liu, Guo-Qiang,et al. Anomalous Thermopower and High ZT in GeMnTe2 Driven by Spin's Thermodynamic Entropy[J]. RESEARCH,2021,2021. |
| APA | Duan, Sichen.,Yin, Yinong.,Liu, Guo-Qiang.,Man, Na.,Cai, Jianfeng.,...&Jiang, Jun.(2021).Anomalous Thermopower and High ZT in GeMnTe2 Driven by Spin's Thermodynamic Entropy.RESEARCH,2021. |
| MLA | Duan, Sichen,et al."Anomalous Thermopower and High ZT in GeMnTe2 Driven by Spin's Thermodynamic Entropy".RESEARCH 2021(2021). |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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