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Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe3-delta GeTe2: the role of Fe vacancies | |
Yang, Haiyang1,2,3; Wang, Qi1,2; Huang, Junwu1,2; Wang, Zhouliang1,2; Xia, Keqi1,2; Cao, Chao1,2,4; Tian, Mingliang3![]() | |
2022-11-01 | |
发表期刊 | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
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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 | |
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). |
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