Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe3-delta GeTe2: the role of Fe vacancies

doi:10.1007/s11433-022-1938-0

	Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe3-delta GeTe2: the role of Fe vacancies
	Yang, Haiyang 1,2,3; Wang, Qi 1,2; Huang, Junwu 1,2; Wang, Zhouliang 1,2; Xia, Keqi 1,2; Cao, Chao 1,2,4; Tian, Mingliang 3; Xu, Zhuan 5; Dai, Jianhui 1,2; Li, Yuke 1,2
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2022-11-01
卷号	65
关键词	thermoelectronic effect Hall effect quantum transport topological Weyl semimetal
ISSN号	1674-7348
DOI	10.1007/s11433-022-1938-0
通讯作者	Cao, Chao(ccao@zju.edu.cn) ; Dai, Jianhui() ; Li, Yuke(yklee@hznu.edu.cn)
英文摘要	Anomalous Nernst effect, as a thermal partner of anomalous Hall effect, is particularly sensitive to the Berry curvature anomaly near the Fermi level, and has been used to probe the topological nature of quantum materials. In this work, we report the observation of both effects in the ferromagnetic Weyl-semimetal Fe3-delta GeTe2 with tunable Fe vacancies. With decreasing Fe vacancies, the anomalous Hall conductivity evolves as a function of the longitudinal conductivity from the hopping region to the region where the intrinsic Berry curvature contribution dominates. Concomitant evolutions in the anomalous Nernst signal and the anomalous off-diagonal thermoelectric coefficient are observed below the Curie temperature, displaying a unique sign change caused by the Fe vacancies. Combining these results with first-principles calculations, we argue that the Fe-vacancy concentration plays a unique role in simultaneously tuning the chemical potential and ferromagnetism, which in turn controls the Berry curvature contribution in this family of ferromagnetic topological semimetals.
资助项目	National Natural Science Foundation of China[U1932155] ; National Natural Science Foundation of China[11874136] ; National Natural Science Foundation of China[11874137] ; National Natural Science Foundation of China[U19A2093] ; National Key Projects for Research and Development of China[2019YFA0308602] ; Key R&D Program ofZhejiang Province China[2021C01002] ; Wuhan National High Magnetic Field Center[2016KF03]
WOS关键词	ULTRAHIGH MOBILITY ; MAGNETORESISTANCE
WOS研究方向	Physics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000850550000002
资助机构	National Natural Science Foundation of China ; National Key Projects for Research and Development of China ; Key R&D Program ofZhejiang Province China ; Wuhan National High Magnetic Field Center
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/128845]
专题	中国科学院合肥物质科学研究院
通讯作者	Cao, Chao; Dai, Jianhui; Li, Yuke
作者单位	1.Hangzhou Normal Univ, Sch Phys, Hangzhou 311121, Peoples R China 2.Hangzhou Normal Univ, Hangzhou Key Lab Quantum Matters, Hangzhou 311121, Peoples R China 3.Chinese Acad Sci, High Magnet Field Lab, Anhui Prov Key Lab Condensed Matter Phys Extreme, Hefei 230031, Peoples R China 4.Zhejiang Univ, Dept Phys, Hangzhou 310058, Peoples R China 5.Zhejiang Univ, Zhejiang Prov Key Lab Quantum Technol & Device, Hangzhou 310027, Peoples R China
推荐引用方式 GB/T 7714	Yang, Haiyang,Wang, Qi,Huang, Junwu,et al. Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe3-delta GeTe2: the role of Fe vacancies[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2022,65.
APA	Yang, Haiyang.,Wang, Qi.,Huang, Junwu.,Wang, Zhouliang.,Xia, Keqi.,...&Li, Yuke.(2022).Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe3-delta GeTe2: the role of Fe vacancies.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,65.
MLA	Yang, Haiyang,et al."Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe3-delta GeTe2: the role of Fe vacancies".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 65(2022).