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arXiv 2103.13069cond-mat.mtrl-sci
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ZrTe5中的大能斯特效应和场增强横向ZT

Large Nernst effect and field enhanced transversal ZT in ZrTe5

Wang Peipei, Cho Chang-woo, Tang Fangdong, Wang Peng, Zhang Wenjie, He Mingquan, Gu Genda, Wu Xiaosong, Shao Yonghong, Zhang Liyuan

摘要:

热电材料可以从废热中回收电能,也可以从废热中回收电能,这在绿色能源收集和固态制冷方面具有重要意义。热电优值(zT)量化了能量转换效率,并且大的塞贝克或能斯特效应对于热电器件的开发至关重要。在这里,我们提出了一个显着大的能斯特热电势在拓扑半金属ZrTe 5,这是由于强Berry曲率和双极输运。在T= 100 K和B= 13 T时,最大的面内S_xy(当B//b时)接近1900 μV/K,面外S_xz(当B//c时)达到5000 μV/K。作为z_NT的关键部分,面内S_xy和电阻率\r{ho}_y y随B的线性增加,导致z_NT在高场下几乎线性增加而不饱和。在B=13 T,T= 120 K时,得到最大z_N_T,为0.12,明显优于相同条件下的纵向z_N_T。

英文摘要:

Thermoelectric materials can recover electrical energy from waste heat and vice versa, which are of great significance in green energy harvesting and solid state refrigerator. The thermoelectric figure of merit (zT) quantifies the energy conversion efficiency, and a large Seebeck or Nernst effect is crucial for the development of thermoelectric devices. Here we present a significantly large Nernst thermopower in topological semimetal ZrTe5, which is attributed to both strong Berry curvature and bipolar transport. The largest in-plane S_xy (when B//b) approaches 1900 μV/K at T=100K and B=13T, and the out-of-plane S_xz (when B//c) reaches 5000 μV/K. As a critical part of z_N T, the linearly increased in-plane S_xy and resistivity \r{ho}_yy regard to B induces an almost linear increasing transversal z_N T without saturate under high fields. The maximum z_N T of 0.12 was obtained at B=13 T and T= 120K, which significantly surmounts its longitudinal counterpart under the same condition.

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