{"title":"掺杂 Ge 的本征磁性拓扑绝缘体 MnBi2Te4 的磁学和电学输运研究","authors":"Qingwang Bai, Mingxiang Xu","doi":"10.1007/s11467-024-1408-5","DOIUrl":null,"url":null,"abstract":"<div><p>As an intrinsic magnetic topological insulator with magnetic order and non-trivial topological structure, MnBi<sub>2</sub>Te<sub>4</sub> is an ideal material for studying exotic topological states such as quantum anomalous Hall effect and topological axion insulating states. Here, we carry out magnetic and electrical transport measurements on (Mn<sub>1−<i>x</i></sub>Ge<sub><i>x</i></sub>)Bi<sub>2</sub>Te<sub>4</sub> (<i>x</i> = 0, 0.15, 0.30, 0.45, 0.60, and 0.75) single crystals. It is found that with increasing <i>x</i>, the dilution of magnetic moments gradually weakens the antiferromagnetic exchange interaction. Moreover, Ge doping reduces the critical field of ferromagnetic ordering, which may provide a possible way to implement the quantum anomalous Hall effect at lower magnetic field. Electrical transport measurements suggest that electrons are the dominant charge carriers, and the carrier density increases with the Ge doping ratio. Additionally, the Kondo effect is observed in the samples with <i>x</i> = 0.45, 0.60, and 0.75. Our results suggest that doping germanium is a viable way to tune the magnetic and electrical transport properties of MnBi<sub>2</sub>Te<sub>4</sub>, opening up the possibility of future applications in magnetic topological insulators.\n</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":"19 3","pages":""},"PeriodicalIF":6.5000,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Magnetic and electrical transport study of the intrinsic magnetic topological insulator MnBi2Te4 with Ge doping\",\"authors\":\"Qingwang Bai, Mingxiang Xu\",\"doi\":\"10.1007/s11467-024-1408-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>As an intrinsic magnetic topological insulator with magnetic order and non-trivial topological structure, MnBi<sub>2</sub>Te<sub>4</sub> is an ideal material for studying exotic topological states such as quantum anomalous Hall effect and topological axion insulating states. Here, we carry out magnetic and electrical transport measurements on (Mn<sub>1−<i>x</i></sub>Ge<sub><i>x</i></sub>)Bi<sub>2</sub>Te<sub>4</sub> (<i>x</i> = 0, 0.15, 0.30, 0.45, 0.60, and 0.75) single crystals. It is found that with increasing <i>x</i>, the dilution of magnetic moments gradually weakens the antiferromagnetic exchange interaction. Moreover, Ge doping reduces the critical field of ferromagnetic ordering, which may provide a possible way to implement the quantum anomalous Hall effect at lower magnetic field. Electrical transport measurements suggest that electrons are the dominant charge carriers, and the carrier density increases with the Ge doping ratio. Additionally, the Kondo effect is observed in the samples with <i>x</i> = 0.45, 0.60, and 0.75. Our results suggest that doping germanium is a viable way to tune the magnetic and electrical transport properties of MnBi<sub>2</sub>Te<sub>4</sub>, opening up the possibility of future applications in magnetic topological insulators.\\n</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>\",\"PeriodicalId\":573,\"journal\":{\"name\":\"Frontiers of Physics\",\"volume\":\"19 3\",\"pages\":\"\"},\"PeriodicalIF\":6.5000,\"publicationDate\":\"2024-05-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Frontiers of Physics\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11467-024-1408-5\",\"RegionNum\":2,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Frontiers of Physics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s11467-024-1408-5","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
作为一种具有磁有序和非三重拓扑结构的本征磁性拓扑绝缘体,MnBi2Te4 是研究量子反常霍尔效应和拓扑轴心绝缘态等奇异拓扑态的理想材料。在这里,我们对 (Mn1-xGex)Bi2Te4(x = 0、0.15、0.30、0.45、0.60 和 0.75)单晶体进行了磁学和电学输运测量。研究发现,随着 x 的增加,磁矩的稀释会逐渐减弱反铁磁交换相互作用。此外,Ge 掺杂降低了铁磁有序的临界磁场,这为在较低磁场下实现量子反常霍尔效应提供了可能。电传输测量表明,电子是主要的电荷载流子,载流子密度随 Ge 掺杂比例的增加而增加。此外,在 x = 0.45、0.60 和 0.75 的样品中观察到了近藤效应。我们的研究结果表明,掺杂锗是调整 MnBi2Te4 的磁性和电性传输特性的一种可行方法,为未来应用于磁性拓扑绝缘体提供了可能。
Magnetic and electrical transport study of the intrinsic magnetic topological insulator MnBi2Te4 with Ge doping
As an intrinsic magnetic topological insulator with magnetic order and non-trivial topological structure, MnBi2Te4 is an ideal material for studying exotic topological states such as quantum anomalous Hall effect and topological axion insulating states. Here, we carry out magnetic and electrical transport measurements on (Mn1−xGex)Bi2Te4 (x = 0, 0.15, 0.30, 0.45, 0.60, and 0.75) single crystals. It is found that with increasing x, the dilution of magnetic moments gradually weakens the antiferromagnetic exchange interaction. Moreover, Ge doping reduces the critical field of ferromagnetic ordering, which may provide a possible way to implement the quantum anomalous Hall effect at lower magnetic field. Electrical transport measurements suggest that electrons are the dominant charge carriers, and the carrier density increases with the Ge doping ratio. Additionally, the Kondo effect is observed in the samples with x = 0.45, 0.60, and 0.75. Our results suggest that doping germanium is a viable way to tune the magnetic and electrical transport properties of MnBi2Te4, opening up the possibility of future applications in magnetic topological insulators.
期刊介绍:
Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include:
Quantum computation and quantum information
Atomic, molecular, and optical physics
Condensed matter physics, material sciences, and interdisciplinary research
Particle, nuclear physics, astrophysics, and cosmology
The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.