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

HFCAS OpenIR

	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, Mingliang3 ; Xu, Zhuan 5; Dai, Jianhui 1,2; Li, Yuke 1,2
	2022-11-01
发表期刊	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
ISSN	1674-7348
通讯作者	Cao, Chao(ccao@zju.edu.cn) ; Dai, Jianhui() ; Li, Yuke(yklee@hznu.edu.cn)
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.
关键词	thermoelectronic effect Hall effect quantum transport topological Weyl semimetal
DOI	10.1007/s11433-022-1938-0
关键词[WOS]	ULTRAHIGH MOBILITY ; MAGNETORESISTANCE
收录类别	SCI
语种	英语
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]
项目资助者	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
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000850550000002
出版者	SCIENCE PRESS
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/128846
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).