我们报告的磁性结构的室温稳定,单斜Mn $_3$作为$_2$在3 K和250 K使用中子粉末衍射测量。从磁测量数据,Mn $_3$ As $_2$的居里温度被确认为约270 K。量热分析表明,在225K时存在另一个相变.在270 K时,Mn $_3$ As $_2$在磁空间群$C2/m$(#12.58)中经历$k = 0$亚铁磁有序,Mn矩指向$b$。在225 K以下,在$ac$平面中存在Mn磁矩的倾斜,这产生了空间群为$C2/c$(#15.85)的多$k$非共线磁结构。Mn矩沿$b$方向的分量遵循$k=0$序,沿$a$和$c$方向的分量具有$k = [0 0 \frac{1}{2}]$传播矢量.磁基态随温度的变化提供了一个更深入的了解的因素,管理磁有序锰砷化合物。
英文摘要:
We report the magnetic structure of room-temperature-stable, monoclinic Mn$_3$As$_2$ at 3 K and 250 K using neutron powder diffraction measurements. From magnetometry data, the Curie temperature of Mn$_3$As$_2$ was confirmed to be around 270 K. Calorimetry analysis showed the presence of another transition at 225 K. At 270 K, Mn$_3$As$_2$ undergoes a $k = 0$ ferrimagnetic ordering in the magnetic space group $C2/m$ (#12.58) with Mn moments pointing along $b$. Below 225 K, there is a canting of Mn moments in the $ac$ plane which produces a multi-$k$ non-collinear magnetic structure in space group $C2/c$ (#15.85). The components of Mn moments along $b$ follow $k=0$ ordering and the components along $a$ and $c$ have $k = [0 0 \frac{1}{2}]$ propagation vector. The change in the magnetic ground state with temperature provides a deeper insight into the factors that govern magnetic ordering in Mn-As compounds.
Transition between canted antiferromagnetic and spin-polarized ferromagnetic quantum Hall states in graphene on a ferrimagnetic insulator
在石墨烯的量子霍尔机制中,在零朗道能级处的反铁磁态和自旋极化铁磁态竞争,导致取决于所施加的磁场的方向和大小的倾斜反铁磁态。在这里,我们调查这种过渡在2.7 K的石墨烯霍尔棒,接近耦合到亚铁磁绝缘体Y $_{3}$ Fe $_{5}$ O $_{12}$。从非局域输运测量,我们证明了在石墨烯中的诱导磁交换场,这降低了所需的磁场调制的磁性状态在石墨烯。这些结果表明,石墨烯中的磁邻近效应是二维材料开发的重要组成部分,其中期望物质的有序状态可以用相对小的施加磁场(> 6 T)来调节。
Canted ferromagnetic order in a distorted triangular-lattice magnet Na$_2$SrCo(VO$_4$)$_2$
School of Physics, Beihang University(北京航空航天大学物理学院);Department of Nuclear Physics, China Institute of Atomic Energy(中国原子能科学研究院核物理研究所);Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所凝聚态物理国家实验室);Spallation Neutron Source Science Center(散裂中子源科学中心);Songshan Lake Materials Laboratory(松山湖材料实验室);State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University(北京大学物理学院介观物理国家重点实验室)
Does a surface spin-flop occur in antiferromagnetically coupled multilayers? Magnetic states and reorientation transitions in antiferromagnetic superlattices
Emergence of a spin Hall topological Hall effect in the non-collinear phase of the ferrimagnetic insulator terbium-iron garnet
Institute of Physics, Johannes Gutenberg University Mainz(美因茨约翰内斯·古腾堡大学物理研究所);Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C-1), Forschungszentrum Jülich GmbH(于利希研究中心格恩斯特·鲁斯卡电子显微与光谱中心(ER-C-1));Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology(挪威科技大学量子自旋电子学中心)
Crystal structure, magnetic and resonant properties of decorated spin kagome system (CsCl)Cu$_5$As$_2$O$_{10}$
St. Petersburg State University(圣彼得堡国立大学);Kola Science Centre, RAS(俄罗斯科学院科拉科学中心);Okayama University(冈山大学);Indian Institute of Technology Madras(马德拉斯印度理工学院);Lebedev Physical Institute, RAS(俄罗斯科学院列别捷夫物理研究所);Moscow State University(莫斯科国立大学);National University of Science and Technology MISIS(俄罗斯科技大学米西斯国立大学)
Magnetic structure evolution and magnetoelastic coupling across the spin reorientation transition in TmCrO3
Graphic Era Hill University(格拉菲克埃拉山大学);Center for Integrated Nanostructure Physics, Institute for Basic Science(基础科学研究所集成纳米结构物理中心);National Synchrotron Radiation Research Center(国家同步辐射研究中心);National High Magnetic Field Laboratory(国家高磁场实验室);UGC-DAE Consortium for Scientific Research(UGC-DAE科学研究联盟);FAMU-FSU College of Engineering, Florida State University(佛罗里达州立大学 FAMU-FSU 工程学院)
Theoretical and Experimental Investigation on Structural, Electronic and Magnetic Properties of layered Mn5O8
我们研究了晶体,电子和磁性结构的Mn 5 O 8的最先进的密度泛函理论计算和中子粉末衍射(NPD)测量。该化合物稳定在具有空间群C2/m的单斜晶系结构中,其中Mn离子与氧原子处于扭曲的八面体和三角棱柱配位。当我们考虑到正确的磁结构和库仑关联效应时,基于总能量计算的结构参数与低温NPD测量结果吻合得很好。基于组分之间的晶体轨道哈密顿量布居的键强度分析表明,键行为具有强各向异性,导致其晶体结构的分层性质。采用Hubbard U(GGA+U)的完全相对论广义梯度近似,我们发现Mn_5O_8的磁序为A型反铁磁,易磁化轴方向为[100],与磁化率和NPD测量结果一致.然而,在不考虑HubbardU的情况下,计算结果将亚铁磁半金属看作是基态,这与实验结果相矛盾,表明该材料中存在很强的库仑关联效应.不考虑库仑修正效应的GGA计算本身足以再现我们在各种Mn位上实验观察到的磁矩。
Magnetic field tuning of modulated magnetic orders in CrOCl at the two-dimensional limit
Laboratoire National des Champs Magnétiques Intenses, LNCMI-EMFL, CNRS UPR3228,Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, INSA-T(强磁场国家实验室,LNCMI-EMFL,CNRS UPR3228,格勒诺布尔阿尔卑斯大学,图卢兹大学,图卢兹第三大学,法国国家应用科学研究院图卢兹);Dr. B. R. Ambedkar National Institute of Technology, Jalandhar(B.R.安贝德卡尔国立理工学院);University of Chemistry and Technology Prague(布拉格化学技术大学);Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut NEEL(格勒诺布尔阿尔卑斯大学,法国国家科学研究中心,格勒诺布尔理工学院,NEEL研究所)
Complex magnetic exchange, anisotropy and skyrmionic textures in two-dimensional FeXZ$_{2}$ (\textit{X} = Nb, Ta and \textit{Z} = S, Se, Te) ferromagnets