CeCoIn5 is a heavy fermion Type-II superconductor which exhibits clear indications of Pauli-limited superconductivity. A variety of measurements give evidence for a transition at high magnetic fields inside the superconducting state, when the field is applied either parallel to or perpendicular to the c axis. When the field is perpendicular to the c axis, antiferromagnetic order is observed on the high-field side of the transition, with a magnetic wavevector of (q q 0.5), where q = 0.44 reciprocal lattice units. We show that this order remains as the magnetic field is rotated out of the basal plane, but the associated moment eventually disappears above 17 degrees, indicating that the anomalies seen with the field parallel to the c axis are not related to this magnetic order. We discuss the implications of this finding.
Dirac nodal pockets in the antiferromagnetic parent phase of FeAs superconductors
我们发现,以前测得的小费米表面口袋内的反铁磁相SrFe 2 As 2和BaFe 2 As 2是一致的狄拉克色散调制层间跳跃,从而产生一个狄拉克点在k-空间和一个尖点的磁场角度依赖的磁量子振荡频率。这些发现支持了这些材料中节自旋密度波的存在,这可能在保护金属态免受局域化效应方面发挥重要作用。SrFe_2As_2和BaFe_2As_2中狄拉克费米子的速度比石墨烯中慢14-20倍,这表明磷属元素化物为探索强相互作用狄拉克费米子的效应提供了实验室。
Exploring d-Wave Magnetism in Cuprates from Oxygen Moments
Technical University of Munich(慕尼黑工业大学);Xi’an Jiaotong University(西安交通大学);University of Warsaw(华沙大学);Goethe-Universität Frankfurt(法兰克福歌德大学);Imperial College London(伦敦帝国理工学院)
Effect of Ni substitution on the fragile magnetic system ${\text{La}_{5}\text{Co}_{2}\text {Ge}_{3}}$
Ames National Laboratory, U.S. DOE(美国能源部爱姆斯国家实验室);Iowa State University(爱荷华州立大学);Department of Physics and Astronomy, Iowa State University(爱荷华州立大学物理与天文学系);Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut(保罗谢勒研究所μ子自旋谱学实验室)
Robust A-type order and spin-flop transition on the surface of the antiferromagnetic topological insulator MnBi$_2$Te$_4$
在这里,我们提出的单轴A型反铁磁秩序的持久性的MnBi $_2$ Te $_4$单晶的表面层使用磁力显微镜的微观证据。我们的研究结果揭示了终止相关的磁衬度在两个表面台阶边缘和畴壁,这可以被屏蔽的软磁薄层。强大的表面A型秩序进一步证实了观察终止相关的表面自旋翻转转变,这已经在几十年前理论上提出。我们的研究结果不仅为理解反铁磁拓扑绝缘体MnBi $_2$ Te $_4$的电子性质提供了关键成分,而且也为探索天然反铁磁体中的内禀表面变磁转变开辟了一个新的范例.
Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr$_{1-x}$Eu$_x$Pt$_4$Ge$_{12}$
受当前多带电子系统中磁性和超导性之间相互作用的研究工作的启发,我们通过热力学测量研究了Eu取代对超导填充方钴矿合金Pr $_{1-x}$ Eu $_x$ Pt $_4$ Ge $_{12}$的影响。Eu浓度的增加导致超导转变温度的抑制与由于Eu局部矩的磁熵的增加一致。虽然低温热容量异常是目前在整个掺杂范围内,我们发现,在合金与$x\leq0.5$的肖特基峰的热容量在超导状态出现是由于塞曼分裂的内部磁场。我们的理论模型表明,这个字段是一个结果的短程反铁磁相关的铕离子之间。对于具有$x > 0.5$的样品,热容中的峰信号反铁磁(AFM)有序化的Eu矩的开始。
Analysis of model parameter dependences on the second-order nonlinear conductivity in $\mathcal{PT}$-symmetric collinear antiferromagnetic metals with magnetic toroidal moment on zigzag chains
Suppression of the tendency toward antiferromagnetic order in the Dirac semimetal SrIrO$_3$
ShanghaiTech University(上海科技大学);Westlake University(西湖大学);Argonne National Laboratory(阿贡国家实验室);University of Science and Technology of China(中国科学技术大学);Zhengzhou University(郑州大学);Henan Academy of Sciences(河南省科学院)
Exploring Low-Dimensional Magnetism in Cobalt Vanadates, ${A}$CoV$_{2}$O$_{7}$~(${A}$~=~Ca, Sr) : Crystal Growth and Magnetic Properties of Effective Spin-1/2 Zigzag Chains
The influence of spin-phonon coupling on antiferromagnetic spin fluctuations in FeSe under pressure: the First-principles calculations with van der Waals corrections
Tunable bifurcation of magnetic anisotropy and bi-oriented antiferromagnetic order in kagome metal GdTi3Bi4
Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学);Department of Physics and State Key Laboratory of Surface Physics, Fudan University(复旦大学)
Antiferromagnetic stripe phase and large-gap insulating ground state of the correlated $\sqrt{3}\times\sqrt{3}$~R30$^{\circ}$-Sn/Si(111) single atomic layer
Sorbonne Université, CNRS, Institut des Nanosciences de Paris(索邦大学,法国国家科学研究中心,巴黎纳米科学研究所);Department of Physical and Chemical Sciences, University of L’Aquila(拉奎拉大学物理与化学科学系);CNR-SPIN c/o Department of Physical and Chemical Sciences, University of L’Aquila(意大利国家研究委员会自旋物理中心(挂靠拉奎拉大学物理与化学科学系));Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS UMR 7590, MNH(矿物学、材料物理与宇宙化学研究所(IMPMC),索邦大学,法国国家科学研究中心UMR 7590,自然历史博物馆)
Magnetic quantum defects in a uniaxial antiferromagnetic insulator
Rutgers University(罗格斯大学);Beijing Academy of Quantum Information Sciences(北京量子信息科学研究院);National Institute of Chemical Physics and Biophysics(化学物理与生物物理学国立研究所);University of South Carolina(南卡罗来纳大学)
Quantum criticality and emergent orders in the spin-1 bilinear-biquadratic-Kitaev chain
National Laboratory of Solid State Microstructures(固体微结构物理国家重点实验室);Department of Physics, Nanjing University(南京大学物理学院);Suzhou Institute for Advanced Research, University of Science and Technology of China(中国科学技术大学苏州高等研究院);School of Artificial Intelligence and Data Science, University of Science and Technology of China(中国科学技术大学人工智能与数据科学学院);College of Physics, Nanjing University of Aeronautics and Astronautics(南京航空航天大学物理学院);Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT(工业和信息化部航空航天信息材料与物理重点实验室);Collaborative Innovation Center of Advanced Microstructures, Nanjing University(南京大学先进微结构协同创新中心)
Magnetically activated optical visibility of many-body excitons in NiPS$_3$
University of Tokyo(东京大学);RIKEN Center for Emergent Matter Science (CEMS)(理化学研究所 emergent matter science center);Trans-scale Quantum Science Institute, University of Tokyo(东京大学 跨尺度量子科学研究所)
Structural and Magnetic Transitions in the Planar Antiferromagnet Ba$_4$Ir$_3$O$_{10}$
我们报告的结构和磁基态性能的单斜化合物钡铱氧化物Ba $_4$ Ir $_3$ O $_{10}$使用共振X射线散射,磁力计和热力学技术相结合。磁化率在$T_{\text{N}}$ $\approx$ 25 K处表现出明显的反铁磁转变,在$T_{\text{S}}$ $\approx$ 142 K处表现出较弱的反常,并且在所有温度下都表现出强的磁各向异性。共振弹性X射线散射实验揭示了在$T_{\text{S}}$处的二级结构相变和在$T_{\text{N}}$处的磁性相变。在$L$ =半整数值处观察到结构和磁性超晶格峰。在$T_{\text{S}}$的磁化异常意味着磁弹性耦合的存在,这可以想象促进对称性降低。在$T_{\text{S}}$上方观察到平均场临界散射。根据测得的磁超晶格峰强度讨论了反铁磁基态的磁结构。我们的研究不仅为理解Ba $_4$ Ir $_3$ O $_{10}$中相互交织的结构和磁性提供了必要的信息,而且还强调了探索八面体三聚体新基态的必要成分。