Spin fluctuations yield zT enhancement in ferromagnets

Summary: Thermal fluctuation of local magnetization intercoupled with charge carriers and phonons offers a path to enhance thermoelectric performance. Thermopower enhancement by spin fluctuations (SF) has been observed before. However, the crucial evidence for enhancing thermoelectric-figure-of-meri...

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Auteurs principaux:	Md Mobarak Hossain Polash, Daryoosh Vashaee
Format:	article
Langue:	EN
Publié:	Elsevier 2021
Sujets:	Magnetism Magnetic materials Energy materials Science Q
Accès en ligne:	https://doaj.org/article/be613fb621c84a1db48f0a22b26efc7d
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spelling	oai:doaj.org-article:be613fb621c84a1db48f0a22b26efc7d2021-11-20T05:10:35ZSpin fluctuations yield zT enhancement in ferromagnets2589-004210.1016/j.isci.2021.103356https://doaj.org/article/be613fb621c84a1db48f0a22b26efc7d2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2589004221013250https://doaj.org/toc/2589-0042Summary: Thermal fluctuation of local magnetization intercoupled with charge carriers and phonons offers a path to enhance thermoelectric performance. Thermopower enhancement by spin fluctuations (SF) has been observed before. However, the crucial evidence for enhancing thermoelectric-figure-of-merit (zT) by SF has not been reported until now. Here we report that the SF leads to nearly 80% zT enhancement in ferromagnetic CrTe near and below TC ∼ 335 K. The ferromagnetism is originated from the collective electronic and localized magnetic moments. The field-dependent transport properties demonstrate the profound impact of SF on the electrons and phonons. Under an external magnetic field, the enhancement in thermopower is suppressed, and the thermal conductivity is enhanced, evidencing the existence of a strong SF. The anomalous thermoelectric transport properties are analyzed based on theoretical models, and a good agreement with experimental data is found. This study contributes to the fundamental understanding of SF for designing high-performance spin-driven thermoelectrics.Md Mobarak Hossain PolashDaryoosh VashaeeElsevierarticleMagnetismMagnetic materialsEnergy materialsScienceQENiScience, Vol 24, Iss 11, Pp 103356- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Magnetism Magnetic materials Energy materials Science Q
spellingShingle	Magnetism Magnetic materials Energy materials Science Q Md Mobarak Hossain Polash Daryoosh Vashaee Spin fluctuations yield zT enhancement in ferromagnets
description	Summary: Thermal fluctuation of local magnetization intercoupled with charge carriers and phonons offers a path to enhance thermoelectric performance. Thermopower enhancement by spin fluctuations (SF) has been observed before. However, the crucial evidence for enhancing thermoelectric-figure-of-merit (zT) by SF has not been reported until now. Here we report that the SF leads to nearly 80% zT enhancement in ferromagnetic CrTe near and below TC ∼ 335 K. The ferromagnetism is originated from the collective electronic and localized magnetic moments. The field-dependent transport properties demonstrate the profound impact of SF on the electrons and phonons. Under an external magnetic field, the enhancement in thermopower is suppressed, and the thermal conductivity is enhanced, evidencing the existence of a strong SF. The anomalous thermoelectric transport properties are analyzed based on theoretical models, and a good agreement with experimental data is found. This study contributes to the fundamental understanding of SF for designing high-performance spin-driven thermoelectrics.
format	article
author	Md Mobarak Hossain Polash Daryoosh Vashaee
author_facet	Md Mobarak Hossain Polash Daryoosh Vashaee
author_sort	Md Mobarak Hossain Polash
title	Spin fluctuations yield zT enhancement in ferromagnets
title_short	Spin fluctuations yield zT enhancement in ferromagnets
title_full	Spin fluctuations yield zT enhancement in ferromagnets
title_fullStr	Spin fluctuations yield zT enhancement in ferromagnets
title_full_unstemmed	Spin fluctuations yield zT enhancement in ferromagnets
title_sort	spin fluctuations yield zt enhancement in ferromagnets
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/be613fb621c84a1db48f0a22b26efc7d
work_keys_str_mv	AT mdmobarakhossainpolash spinfluctuationsyieldztenhancementinferromagnets AT daryooshvashaee spinfluctuationsyieldztenhancementinferromagnets
_version_	1718419564100845568

Spin fluctuations yield zT enhancement in ferromagnets

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