中文版 | English
Title

本征磁性拓扑绝缘体的高压输运研究

Alternative Title
PRESSURETUNING OF TRANSPORT PROPERTIES OF INTRINSIC MAGNETIC TOPOLOGICAL INSULATOR
Author
Name pinyin
Lijingyuan
School number
11930017
Degree
硕士
Discipline
070205 凝聚态物理
Subject category of dissertation
07 理学
Supervisor
赵悦
Mentor unit
物理系
Publication Years
2022-05-13
Submission date
2022-06-29
University
南方科技大学
Place of Publication
深圳
Abstract

本征磁性拓扑绝缘体MnBi2Te4(Bi2Te3)n异质结蕴含着磁性与拓扑序的奇异相互作用,与量子反常霍尔效应等量子现象密切相关。随着非磁性Bi2Te3层的层数n增多,实验表明MnBi2Te4(Bi2Te3)n的磁基态由A型反铁磁(A-AFM)过渡为铁磁(FM),然而层内都展现了比较稳定的铁磁耦合。本论文主要通过高压原位输运测量手段,系统性地探究了等静水压对MnBi4Te7n=1),MnBi6Te10n = 2)磁基态的调控。随着压力的增大,我们发现MnBi4Te7MnBi6Te10的磁转变温度均有下降,MnBi4Te7保持在A型反铁磁基态,而MnBi6Te101.98GPa时发生了由A型反铁磁体转变至准二维铁磁体的相变。高压磁性测量进一步证实了1.98GPaMnBi6Te10发生了压力诱导的相变。

结合第一性原理分析,我们认为层内晶格压缩诱导的层内反铁磁序与原有铁磁序的竞争抑制了层内磁性,层内磁性的下降将削弱层间耦合;另一方面,层间晶格压缩增强了层间耦合。层间耦合较弱的体系的磁基态(n>1)很大程度取决于层内耦合,因而MnBi6Te10的磁性被等静水压抑制,甚至在1.98GPa时发生了层间脱耦。进一步的Sb掺杂研究显示,x = 0.2Mn(Bi1-xSbx)6Te10已进入准二维铁磁态,我们认为Sb掺杂诱导的相变同样源于层内晶格收缩。

我们还研究了准二维铁磁体MnBi8Te13n=3)的高压输运特性。在高达3.15GPa的压力范围内,MnBi8Te13的磁性被压力显著削弱。特别地,反常霍尔电阻率在1.64GPa时出现了反号,并且反号被压力进一步增强。反号出现的同时还伴随着驼峰状非单调凸起。我们认为该反常行为可能来源于两个反常霍尔信号的叠加。我们的研究显示等静水压能够有效调控MnBi2Te4(Bi2Te3)n的磁基态。其丰富的高压相图蕴藏着拓扑性质与磁性之间复杂的相互作用。

Other Abstract

In intrinsic magnetic topological insulator MnBi2Te4(Bi2Te3)n heterostructures, the interplay between nontrivial band topology and magnetic order produces intriguing states of matter, such as quantum anomalous Hall effect, etc. With the number of nonmagnetic Bi2Te3 spacer layer n increases, it was experimentally shown that the magnetic ground state of MnBi2Te4(Bi2Te3)n goes through a transition from A-type antiferromagnetic (A-AFM) to ferromagnetic (FM), while the intralayer exchange coupling stays FM state. By performing in-situ high pressure magneto-transport measurements, this thesis presents a systematic study of the hydrostatic pressure tuning of both the intralayer and interlayer exchange coupling of MnBi4Te7 (n = 1 ) and MnBi6Te10 (n = 2 ) up to 3.5GPa. We find the intralayer coupling strength of MnBi4Te7 and MnBi6Te10 is reduced by increasing pressure. The magnetic ground state of MnBi4Te7 stays a robust A-AFM state, while MnBi6Te10 undergoes a phase transition from A-type AFM state to quasi-two-dimensional (quasi-2D) FM state at 1.98GPa. The phase transition is further determined by high pressure magnetic measurements.

Through the first-principles calculations analysis, we propose the suppression of the intralayer exchange coupling is rooted in the competition between in-plane-lattice-compression-induced AFM order and intralayer FM order. The suppression of intralayer exchange magnetism will further inhibit the interlayer coupling. On the contrary, the lattice compression along the c axis enhances the interlayer exchange coupling. Intralayer exchange coupling plays an important role in determining the magnetic ground state of weakly coupled magnetic topological insulators (n > 1 ). Thus, the net magnetism of MnBi6Te10 decreases with pressure and adjacent layers are decoupled at 1.98GPa. In addition, we have studied the magnetic properties of Mn(Bi1-xSbx)6Te10. Through Sb doping, we find the magnetic ground state of Mn(Bi1-xSbx)6Te10 emerged as quasi-2D FM state when x = 0.2. The phase transition induced by Sb doping is similarly attributed to in-plane-lattice-compression.

Furthermore, we have studied the high pressure transport properties of quasi-2D ferromagnet MnBi8Te13 (n = 3 ). The net ferromagnetism of MnBi8Te13 is suppressed by pressure up to 3.15GP. In particular, the polarity of the anomalous Hall resistivity is reversed under 1.64GPa. The reversed Hall signal is enhanced by increasing pressure. The sign reversal is accompanied by the emergence of two nonmonotonic humps. We propose the sign reversal could be attributed to the co-existence of two anomalous Hall effect. Our study indicates hydrostatic pressure could be an effective method for the tuning of the magnetic ground state of MnBi2Te4(Bi2Te3)n, in whose high pressure phase diagram the complicated interplay between topology and magnetic order embedded.

Keywords
Language
Chinese
Training classes
独立培养
Enrollment Year
2019
Year of Degree Awarded
2022-06
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Academic Degree Assessment Sub committee
物理系
Domestic book classification number
O469
Data Source
人工提交
Document TypeThesis
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/343155
DepartmentDepartment of Physics
Recommended Citation
GB/T 7714
李婧嫄. 本征磁性拓扑绝缘体的高压输运研究[D]. 深圳. 南方科技大学,2022.
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