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

文献类型：期刊论文

作者Yang, Haiyang1,3,4; Wang, Qi3,4; Huang, Junwu3,4; Wang, Zhouliang3,4; Xia, Keqi3,4; Cao, Chao3,4,5; Tian, Mingliang1; Xu, Zhuan2; Dai, Jianhui3,4; Li, Yuke3,4
刊名SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
出版日期2022-11-01
卷号65
关键词thermoelectronic effect Hall effect quantum transport topological Weyl semimetal
ISSN号1674-7348
DOI10.1007/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.
WOS关键词ULTRAHIGH MOBILITY ; MAGNETORESISTANCE
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研究方向Physics
语种英语
WOS记录号WOS:000850550000002
出版者SCIENCE PRESS
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
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.Chinese Acad Sci, High Magnet Field Lab, Anhui Prov Key Lab Condensed Matter Phys Extreme, Hefei 230031, Peoples R China
2.Zhejiang Univ, Zhejiang Prov Key Lab Quantum Technol & Device, Hangzhou 310027, Peoples R China
3.Hangzhou Normal Univ, Sch Phys, Hangzhou 311121, Peoples R China
4.Hangzhou Normal Univ, Hangzhou Key Lab Quantum Matters, Hangzhou 311121, Peoples R China
5.Zhejiang Univ, Dept Phys, Hangzhou 310058, 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).

入库方式： OAI收割

来源：合肥物质科学研究院

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