Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition

Abstract Negative thermal expansion (NTE) is an intriguing property, which is generally triggered by a single NTE mechanism. In this work, an enhanced NTE (α v = −32.9 × 10−6 K−1, ΔT = 175 K) is achieved in YbMn2Ge2 intermetallic compound to be caused by a dual effect of magnetism and valence trans...

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Autores principales:	Yongqiang Qiao, Yuzhu Song, Andrea Sanson, Longlong Fan, Qiang Sun, Shuxian Hu, Lunhua He, Hongjie Zhang, Xianran Xing, Jun Chen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/36ec7b88665d4c8a8e00576ee8f1177e
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spelling	oai:doaj.org-article:36ec7b88665d4c8a8e00576ee8f1177e2021-12-02T16:50:36ZNegative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition10.1038/s41535-021-00348-z2397-4648https://doaj.org/article/36ec7b88665d4c8a8e00576ee8f1177e2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00348-zhttps://doaj.org/toc/2397-4648Abstract Negative thermal expansion (NTE) is an intriguing property, which is generally triggered by a single NTE mechanism. In this work, an enhanced NTE (α v = −32.9 × 10−6 K−1, ΔT = 175 K) is achieved in YbMn2Ge2 intermetallic compound to be caused by a dual effect of magnetism and valence transition. In YbMn2Ge2, the Mn sublattice that forms the antiferromagnetic structure induces the magnetovolume effect, which contributes to the NTE below the Néel temperature (525 K). Concomitantly, the valence state of Yb increases from 2.40 to 2.82 in the temperature range of 300–700 K, which simultaneously causes the contraction of the unit cell volume due to smaller volume of Yb3+ than that of Yb2+. As a result, such combined effect gives rise to an enhanced NTE. The present study not only sheds light on the peculiar NTE mechanism of YbMn2Ge2, but also indicates the dual effect as a possible promising method to produce enhanced NTE materials.Yongqiang QiaoYuzhu SongAndrea SansonLonglong FanQiang SunShuxian HuLunhua HeHongjie ZhangXianran XingJun ChenNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-6 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Yongqiang Qiao Yuzhu Song Andrea Sanson Longlong Fan Qiang Sun Shuxian Hu Lunhua He Hongjie Zhang Xianran Xing Jun Chen Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition
description	Abstract Negative thermal expansion (NTE) is an intriguing property, which is generally triggered by a single NTE mechanism. In this work, an enhanced NTE (α v = −32.9 × 10−6 K−1, ΔT = 175 K) is achieved in YbMn2Ge2 intermetallic compound to be caused by a dual effect of magnetism and valence transition. In YbMn2Ge2, the Mn sublattice that forms the antiferromagnetic structure induces the magnetovolume effect, which contributes to the NTE below the Néel temperature (525 K). Concomitantly, the valence state of Yb increases from 2.40 to 2.82 in the temperature range of 300–700 K, which simultaneously causes the contraction of the unit cell volume due to smaller volume of Yb3+ than that of Yb2+. As a result, such combined effect gives rise to an enhanced NTE. The present study not only sheds light on the peculiar NTE mechanism of YbMn2Ge2, but also indicates the dual effect as a possible promising method to produce enhanced NTE materials.
format	article
author	Yongqiang Qiao Yuzhu Song Andrea Sanson Longlong Fan Qiang Sun Shuxian Hu Lunhua He Hongjie Zhang Xianran Xing Jun Chen
author_facet	Yongqiang Qiao Yuzhu Song Andrea Sanson Longlong Fan Qiang Sun Shuxian Hu Lunhua He Hongjie Zhang Xianran Xing Jun Chen
author_sort	Yongqiang Qiao
title	Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition
title_short	Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition
title_full	Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition
title_fullStr	Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition
title_full_unstemmed	Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition
title_sort	negative thermal expansion in ybmn2ge2 induced by the dual effect of magnetism and valence transition
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/36ec7b88665d4c8a8e00576ee8f1177e
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Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition

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