Phase-transition-induced giant Thomson effect for thermoelectric cooling
Phase-transition-induced giant Thomson effect for thermoelectric cooling
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DOI：
10.1063/5.0077497
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发表时间：
2022-03-01
影响因子：
15
通讯作者：
Uchida, Ken-ichi
中科院分区：
文献类型：
--
作者：
Modak, Rajkumar;Murata, Masayuki;Uchida, Ken-ichi
塞贝克和珀尔帖效应已被广泛研究并应用于各种热电技术，包括热能收集和固态热泵。然而，关于汤姆逊效应（导体中的另一种基本热电效应）的基础和应用研究是有限的，尽管汤姆逊效应允许通过应用温度梯度偏倚而不是构建结结构来进行电子冷却。在这篇文章中，我们报告了由于磁相变而出现的巨大汤姆逊效应的观察。由于与反铁磁-铁磁相变相关的塞贝克系数对温度的依赖性很大，铁氢基合金的汤姆森系数在室温附近达到接近-1000 μ V K-1的大值。汤姆逊系数比合金的塞贝克系数大几个数量级。利用主动热成像技术，我们证明了即使在接近稳定的状态下，相同材料的汤姆逊冷却也可以比焦耳加热大得多。在ferh基合金中，通过施加外部磁场或稍微改变成分，可以在很大范围内调节巨汤姆逊效应的工作温度。我们的发现为热电材料科学提供了一个新的方向，并为利用汤姆逊效应的热管理应用铺平了道路。(C) 2022作者。除另有说明外，所有文章内容均遵循知识共享署名（CC BY）许可协议（http://creativecommons.org/licenses/by/4.0/）。
The Seebeck and Peltier effects have been widely studied and used in various thermoelectric technologies, including thermal energy harvesting and solid-state heat pumps. However, basic and applied studies on the Thomson effect, another fundamental thermoelectric effect in conductors, are limited despite the fact that the Thomson effect allows electronic cooling through the application of a temperature gradient bias rather than the construction of junction structures. In this article, we report the observation of a giant Thomson effect that appears owing to magnetic phase transitions. The Thomson coefficient of FeRh-based alloys reaches large values approaching -1000 mu V K-1 around room temperature because of the steep temperature dependence of the Seebeck coefficient associated with the antiferromagnetic-ferromagnetic phase transition. The Thomson coefficient is several orders of magnitude larger than the Seebeck coefficient of the alloys. Using the active thermography technique, we demonstrate that the Thomson cooling can be much larger than Joule heating in the same material even in a nearly steady state. The operation temperature of the giant Thomson effect in the FeRh-based alloys can be tuned over a wide range by applying an external magnetic field or by slightly changing the composition. Our findings provide a new direction in the materials science of thermoelectrics and pave the way for thermal management applications using the Thomson effect. (C) 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).