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Progress on the antiferromagnetic topological insulator MnBi2Te4

National Science Review 2024年第2期11卷 33-49页

作者： Shuai Li Tianyu Liu Chang Liu Yayu Wang Hai-Zhou Lu X.C.Xie Hefei National Laboratory International Center for Quantum Materials School of Physics Peking University Institute for Nanoelectronic Devices and Quantum Computing Fudan University Department of Physics Harbin Institute of Technology Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology(SUSTech) Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen Key Laboratory of Quantum Science and Engineering International Quantum Academy Beijing Academy of Quantum Information Sciences Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of Physics Renmin University of China State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua University Frontier Science Center for Quantum Information

Topological materials, which feature robust surface and/or edge states, have now been a research focus in condensed maTher physics. They represent a new class of materials exhibiting nontrivial topological phases,and provide a platform for exploring exotic transport phenomena, such as the quantum anomalous Hall effect and the quantum spin Hall effect. Recently, magnetic topological materials have attracted considerable interests due to the possibility to study the interplay between topological and magnetic orders.In particular, the quantum anomalous Hall and axion insulator phases can be realized in topological insulators with magnetic order. MnBi2Te4, as the first intrinsic antiferromagnetic topological insulator discovered, allows the examination of existing theoretical predictions; it has been extensively studied, and many new discoveries have been made. Here we review the progress made on MnBi2Te4from both experimental and theoretical aspects. The bulk crystal and magnetic structures are surveyed first, followed by a review of theoretical calculations and experimental probes on the band structure and surface states, and a discussion of various exotic phases that can be realized in MnBi2Te4. The properties of MnBi2Te4thin films and the corresponding transport studies are then reviewed, with an emphasis on the edge state transport. Possible future research directions in this field are also discussed.

关键词： MnBi2Te4 magnetic topological insulator antiferromagnetic quantum anomalous Hall effect axion insulator

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Metamagnetic transition and reversible magnetocaloric effect in antiferromagnetic DyNiGa compound

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Chinese Physics B 2020年第7期29卷 502-505页

作者：丁燕红孟凡振王利晨刘若水沈俊 School of Electrical and Electronic Engineering Tianjin Key Laboratory of Film Electronic and Communication DevicesTianjin University of TechnologyTianjin 300384China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Department of Physics Capital Normal UniversityBeijing 100048China University of Chinese Academy of Sciences Beijing 100049China

Rare-earth(R)-based materials with large reversible magnetocaloric effect(MCE)are attracting much attention as the promising candidates for low temperature magnetic refrigeration.In the present work,the magnetic properties and MCE of DyNiGa compound with TiNiSi-type orthorhombic structure are studied systematically.The DyNiGa undergoes a magnetic transition from antiferromagnetic(AFM)to paramagnetic state with Néel temperature TN=17 K.Meanwhile,it does not show thermal and magnetic hysteresis,revealing the perfect thermal and magnetic reversibility.Moreover,the AFM state can be induced into a ferromagnetic state by a relatively low field,and thus leading to a large reversible MCE,e.g.,a maximum magnetic entropy change(-ΔSM)of 10 J/kg·K is obtained at 18 K under a magnetic field change of 5 T.Consequently,the large MCE without thermal or magnetic hysteresis makes the DyNiGa a competitive candidate for magnetic refrigeration of hydrogen liquefaction.

关键词： DyNiGa antiferromagnetic magnetocaloric effect first-order phase transition

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Tunable quantum Shubnikov-de Hass oscillations in antiferromagnetic topological semimetal Mn-doped Cd_(3)As_(2)

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Journal of Materials Science & Technology 2021年第17期76卷 247-253页

作者： Jie Guo Xinguo Zhao Naikun Sun Xiaofei Xiao Wei Liu Zhidong Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China School of Science Shenyang Ligong UniversityShenyang110159China

Three-dimensional Dirac semimetal Cd_(3)As_(2)has been considered as an excellent candidate for applications of electronic devices owing to its ultrahigh mobility and air-stability.However,current researches are focused mainly on the use of gate-voltage to control its carrier transport tunability,while the manipulation of transport properties by element-doping is quite limited.Here we report the tunable magneto-transport properties by adjusting Mn-doping in the Cd_(3)As_(2)compound.We find that Mnelement doping has a strong influence on the Fermi level positions,and the Fermi energy approaches to Dirac point with higher Mn-doping.More importantly,the introduction of Mn atoms transforms diamagnetic Cd_(3)As_(2)to anti ferromagnetic(Cd,Mn)_(3)As_(2),which provides an approach to control topological protected Dirac materials by ma nipulating antiferro magnetic order parameters.The Shubnikov-de Hass oscillation originates from the surface states,and the Landau fan diagram yields a nontrivial Berry phase,indicating the existence of massless Dirac fermions in the(Cd_(1-x)Mn_x)_(3)AS_(2)compounds.Our present results may pave a way for further investigating anti ferromagnetic topological Dirac semimetal and expand the potential applications in optoelectronics and spintronics.

关键词： Mn-doping Dirac topological semimetal Diamagnetic antiferromagnetic Shubnikov-de Hass oscillation

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Thermomechanical effect on magnetic behaviors of antiferromagnetic Mn-Fe(Cu) alloy

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中国有色金属学会会刊：英文版 2009年第S3期19卷 802-805页

作者：彭文屹蔡芬敏王晓宇张骥华杨湘杰章爱生严明明邹海洋 School of Materials Science and Engineering Nanchang University School of Materials Arizona State University School of Materials Science and Engineering Shanghai Jiao Tong University School of Mechatronics Engineering Nanchang University

The effect of thermomechanical treatment on the magnetic properties of Mn85.5Fe9.0Cu0.5 alloy was studied by use of a materials testing machine, a vibrating sample magnetometer, an X-ray diffractometer, a homogeneously and adjustably magnetic field and strain gauges. The results show that the orientation of fct phase and magnetic domains is affected by the thermomechanical treatment. When the compressive strain of thermomechanical treatment is -1.2%, the magnetic-field-induced strain reaches the highest value in the adapted situation.

关键词： thermomechanical treatment antiferromagnetic Mn-Fe(Cu) alloy magnetic-field-induced strain magnetization curve

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Charge Ordering and antiferromagnetic Transition in La_(0.67-x)Pr_xCa_(0.33)MnO_3 (x=0～0.67) Polycrystalline

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Journal of Rare Earths 2007年第S1期25卷 204-206页

作者：曹晓明卢遵铭王立恒李养贤 School of Material Science and Engineering Hebei University of Technology Hebei No.1 Electric Power Construction Company

Polycrystalline samples of La0.67-xPrxCa0.33MnO3(x=0～0.67) were synthesized by a conventional solid state reaction. X-ray diffraction revealed that the samples were all of single phase with an orthorhombic distorted perovskite structure. The magnetization depended on temperature measured in FC (field cooling) and ZFC (zero field cooling). It revealed that the compounds mainly underwent a ferromagnetic transition (TC) when the less Pr doped (x0.5), the ferromagnetic transition disappeared and the antiferromagnetic transition (TN) was dominant. Charge ordering (TCO) also emerged when x>0.36. The transition temperatures TN and TCO would change with the Pr doping content. The phase separation could be used to explain these characters occurred in these polycrystalline samples.

关键词： charge ordering antiferromagnetic phase separation rare earths

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Classical Ground State Spin Ordering of the antiferromagnetic J_1-J_2 Model

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Chinese Physics Letters 2019年第6期36卷 75-78页

作者：朱仁贵 College of Physics and Electronic Information Anhui Normal University

The classical frustrated antiferromagnetic J_1–J_2 model is considered in a description of the classical spin wave for a vector spin system. Its ground state(GS) spin ordering is analyzed by minimizing its energy. Our analytical derivations show that all the spins in the GS phase must lie in planes that are parallel to each other. When applying the derived formulations to concrete lattices such as the square and simple cubic lattices, we find that in the large J_2 region, a large continuous GS degeneracy concluded by a qualitative analysis is lifted, and collinear striped ordering is selected as the GS phase.

关键词： Classical Ground State Spin Ordering antiferromagnetic J1-J2 Model ground state(GS)

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Synthesis,crystal structure,and magnetic properties of a new onedimensional chain antiferromagnet Co(ox)(bib)·H_(2)O(ox=oxalate;bib=1,4-bis(imidazole-1-yl)benzene)

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Nano Research 2023年第2期16卷 3552-3557页

作者： Yan She Yanhong Wang Shuang Li Tao Wang Hongcheng Lu School of Chemistry and Chemical Engineering Key Laboratory of Material Chemistry for Energy Conversion and StorageHubei Key Laboratory of Bioinorganic Chemistry&Materia MedicaHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

A new one-dimensional(1D)chain antiferromagnet Co(ox)(bib)·H_(2)O 1(ox=oxalate;bib=1,4-bis(imidazole-1-yl)benzene)has been successfully synthesized under hydrothermal condition and characterized by single crystal X-ray crystallography,powder X-ray diffraction,thermogravimetric analysis,Fourier transform infrared(FTIR)spectroscopy,magnetic susceptibility,and heat capacity measurements.The CoII ion is connected by oxalate ions in trans-configuration to form 1D CoII–ox–CoII spin chains,which are further separated by the long organic molecule bib.The magnetic susceptibility curve shows that 1 exhibits a feature of broad maximum around 29 K,indicating strong antiferromagnetic interactions with short spin–spin correlations along the spin chains.However,no long-range order is observed due to the negligible interchain interactions through bib ligand and weak hydrogen bonds,which is further confirmed by the heat capacity data.The intrachain interaction J of−8.4 K is estimated.Both magnetic susceptibility and heat capacity results indicate that 1 exhibits a good 1D magnetism.

关键词： 1,4-bis(imidazole-1-yl)benzene antiferromagnetic cobalt chain structure oxalate

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Quaternary antiferromagnetic Ba2BiFeS5 with isolated FeS4 tetrahedra

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Chinese Physics B 2019年第8期28卷 329-332页

作者：王少华张晓雷和畅 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University of ChinaBeijing 100872China State Key Laboratory of Information Photonics and Optical Communications & School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

We report the detailed physical properties of quaternary compound Ba2BiFeS5 with the key structural ingredient of isolated FeS4 tetrahedra.Magnetization and heat capacity measurements clearly indicate that Ba2BiFeS5 has a paramagnetic to antiferromagnetic transition at about 30 K.The calculated magnetic entropy above ordering temperature is much smaller than theoretical value for high-spin Fe^3+ion with S=5/2,implying the possible short-range antiferromagnetic fluctuation in Ba2BiFeS5.

关键词： isolated FeS4 tetrahedra antiferromagnetic transition short-range antiferromagnetic fluctuation

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Linear Entropy of a Driven Central Spin Interacting with an antiferromagnetic Environment

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Natural Science 2014年第7期6卷 532-539页

作者： Mahmoud Abdel-Aty Scientific Publishing Center University of Bahrain Sakhair Bahrain Department of Mathematics Faculty of Science Sohag University Sohag Egypt

We exploit a scheme to obtain a long-lived entanglement using a driven central spin interacting with an antiferromagnetic spin bath. Our numerical results show the effects of different parameters on the population inversion and the entanglement dynamics in terms of the linear entropy. It is shown that the long-lived entanglement is an intriguing result corresponding to the collapse region of the atomic inversion. As illustration, we examine the long-time interaction of the entanglement under the resonance and off-resonance regimes.

关键词： Linear Entropy antiferromagnetic Spin Bath Entanglement

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Excitations for the one-dimensional S = 1 pseudo-Heisenberg antiferromagnetic chain

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Natural Science 2010年第11期2卷 1287-1291页

作者： Elena V. Orlenko Fedor E. Orlenko George G. Zegrya 不详

We are interested in the anisotropic S=1 antiferromagnetic chain. System of particles with an arbitrary spin is described directly from the first principles, based on the symmetry law. The ground state of the one-dimensional S=1 pseudo-Heisenberg antiferromagnet with single-ion anisotropy is calculated. Excitations of the chain in the form of nonlinear spin waves and, in particular, the possibility of a soliton solution is considered.

关键词： Pseudo-Heisenberg Hamiltonian antiferromagnetic Spin-1 Chain Soliton Excitations

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