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Article
Multidisciplinary Sciences
Peixin Qin et al.
Summary: Antiferromagnetic spintronics is a growing field with potential applications in high-density and ultrafast information devices. We describe an exchange-bias effect between collinear antiferromagnet MnPt and non-collinear antiferromagnet Mn3Pt at room temperature, which enables the construction of all-antiferromagnetic tunnel junctions with large nonvolatile magnetoresistance. Atomistic spin dynamics simulations reveal the origin of this effect at the interface of MnPt, while first-principles calculations explain the high magnetoresistance from the spin polarization of Mn3Pt in momentum space. These all-antiferromagnetic tunnel junction devices with minimal stray fields and enhanced spin dynamics could be important for future memory devices.
Article
Physics, Condensed Matter
C. Autieri et al.
Summary: This study investigates the magnetic, electronic, orbital, and structural properties of Ga-doped LaMnO3. The gallium doping reduces the Jahn-Teller effect and the bandgap, but does not lead to a metallic phase due to the reduction in Mn bandwidth. Ga-doping also reduces the orbital order of the antiferromagnetic phase. At x=0.50, Ga-doping promotes the formation of an insulating ferromagnetic phase.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Yaqian Guo et al.
Summary: It has been discovered that collinear antiferromagnets, depending on their symmetries, can break the spin degeneracy in momentum space without spin-orbit coupling. These systems, known as altermagnets, are characterized by a spin-momentum texture determined by crystal and magnetic structure. This study focuses on q = 0 antiferromagnetic compounds in the MAGNDATA database and introduces numerical measures for average momentum-space spin splitting, analyzing over sixty compounds including CoF2, FeSO4F, LiFe2F6, RuO2, CrNb4S8, and CrSb.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Lin-Ding Yuan et al.
Summary: Recent studies have found that energy bands in antiferromagnets can be spin-split even without the presence of spin-orbit coupling. Materials with specific symmetries can enable spin-split antiferromagnetic spintronics without using heavy-atom compounds. This study reveals that the symmetry conditions enabling spin-split antiferromagnets can be explained in terms of local motif pairs, such as octahedra or tetrahedra, each carrying opposite magnetic moments.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Giuseppe Cuono et al.
Summary: We investigate the altermagnetic properties of strongly-correlated transition metal oxides, finding that orbital physics plays a significant role in the altermagnetism. Using first-principles calculations, we demonstrate the presence of orbital-selective altermagnetism in Ca2RuO4. In the case of YVO3, we find that altermagnetism is present in all magnetic orders with different symmetries.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
Jabir Ali Ouassou et al.
Summary: The ability of magnetic materials to modify superconductors has potential applications in thermoelectricity, quantum sensing, and spintronics, making it an active research area. In this study, we focused on the Josephson effect in a type of magnetic material called altermagnets, which have recently attracted attention. We found that despite having different properties compared to ferromagnets and conventional antiferromagnets, altermagnets induce 0-π oscillations. The decay length and oscillation period of the Josephson coupling in altermagnets are different from ferromagnetic junctions and depend on the crystallographic orientation of the altermagnet.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Xin Chen et al.
Summary: In this study, we propose the theoretical predictions of a two-dimensional collinear antiferromagnetic semimetal, CrO, which exhibits remarkable spin-split band structure, spin-momentum locked transport properties, and high Neel temperature. By manipulating the position of spin-polarized anisotropic Weyl points with strain, we demonstrate the possibility of achieving four different antiferromagnetic spintronic states with zero net magnetic moments. These findings provide a new avenue in spintronics without net magnetic moment or strong spin-orbit coupling and have the potential for spintronic applications in antiferromagnetic materials.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Cheng-Ping Zhang et al.
Summary: Recently, it has been discovered that Berry curvature monopoles and dipoles are important in the anomalous Hall and nonlinear Hall effects. In this study, we show that higher-order Berry curvature multipoles can induce higher-order nonlinear anomalous Hall effects. Specifically, an AC Hall voltage perpendicular to the current emerges, with a frequency that is a multiple of the applied current frequency. We analyze the symmetry properties of magnetic point groups and find that quadrupoles, hexapoles, and higher moments of Berry curvature can lead to frequency multiplication. We provide examples of third and fourth-order nonlinear anomalous Hall voltages in certain materials. Our results are supported by symmetry analysis, effective Hamiltonian, and first-principles calculations. We also propose other materials that can exhibit higher-order nonlinear anomalous Hall effects.
Article
Materials Science, Multidisciplinary
Thi Phuong Thao Nguyen et al.
Summary: In this paper, the anomalous Hall effect in the perovskite CaCrO3 is studied as a representative of collinear antiferromagnetic materials. It is found that the C-type antiferromagnetic ordering generates a sizable anomalous Hall conductivity. The enhanced effect is attributed to the spin splitting of Cr-3d bands induced by spin-orbit coupling near the Fermi energy.
Article
Materials Science, Multidisciplinary
Md Shahin Alam et al.
Summary: We present experimental results on the anomalous Hall effect and the anomalous Nernst effect in the noncollinear Weyl semimetal CeAlSi. The anomalous Hall conductivity was measured for two different orientations of the magnetic field, and the results show that they have opposite signs. The origin of this sign difference is attributed to the reconstruction of the band structure under the variation of the spin orientation. We also observed anomalous contribution in the Nernst conductivity, and its temperature dependence is explained using a toy model based on nonzero Berry curvature near the Weyl node.
Article
Physics, Condensed Matter
Ashutosh S. Wadge et al.
Summary: In this study, electron transport and angle-resolved photo-emission spectroscopy (ARPES) measurements were carried out on single crystals of TaAs2. The results show the elliptical shape of the Fermi surface cross-sections and at least four types of carriers contributing to the conductance. Theoretical calculations support the experimental findings and reveal a small n-doping in the samples, shifting the theoretical Fermi level (FL) closer to the Dirac point.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Pengfei Liu et al.
Summary: Symmetry formulated by group theory plays an essential role in the laws of nature. This study shows that the crystallographic symmetry groups of magnetic materials with light elements, where relativistic spin-orbit coupling can be neglected, are larger than conventional magnetic groups. A symmetry description involving partially decoupled spin and spatial rotations, called spin group, is required. The study derives the classifications of spin point groups and the irreducible corepresentations of spin space groups, which reveal more energy degeneracies that are disallowed by magnetic groups. One consequence of the spin group is the discovery of new antiunitary symmetries that protect SOC-free Z(2) topological phases with unique surface-node structures. This work not only demonstrates the physical reality of materials with weak SOC, but also provides insights into the understanding of all solids with and without SOC through a unified group theory.
Article
Physics, Multidisciplinary
Libor Smejkal et al.
Summary: Magnetism is a significant and technologically relevant field in condensed-matter physics, traditionally characterized by ferromagnetism and antiferromagnetism. However, a new magnetic phase called altermagnetism has recently been discovered, which exhibits unique features in spin symmetry and net magnetization. Investigating this phenomenon allows for a deeper understanding of condensed-matter physics and its impact on other research areas.
Article
Engineering, Electrical & Electronic
Zexin Feng et al.
Summary: This study reports an anomalous Hall effect in collinear altermagnetic ruthenium dioxide, with an anomalous Hall conductivity exceeding 1,000 omega(-1) cm(-1). The phenomenon arises from an alternative magnetic phase in RuO2, characterized by alternating spin polarization in both real-space crystal structure and momentum-space band structure. The results could potentially lead to the exploration of topological Berry phases and dissipationless quantum transport in crystals of abundant elements and with a compensated antiparallel magnetic order.
NATURE ELECTRONICS
(2022)
Article
Physics, Multidisciplinary
Libor Smejkal et al.
Summary: Recent research has focused on spintronic and spin-splitting phenomena that break time-reversal symmetry. This study introduces a new approach based on nonrelativistic spin-symmetry groups to resolve the conflicting notions of unconventional ferromagnetism or antiferromagnetism and proposes a third type of magnetic phase. The research identifies crystal-rotation symmetries and characteristics of materials hosting this phase, including alternating spin-splitting sign and broken time-reversal symmetry.
Article
Materials Science, Multidisciplinary
Tirthankar Chakraborty et al.
Summary: Oxide materials have various properties, but experimental evidence of their topological nature is rare. This paper reveals the topological nature of oxide double perovskite Sr2FeMoO6 by investigating its structural, magnetic, and electronic properties. It provides a basis for further exploration and realization of the topological properties of oxide systems.
Article
Materials Science, Multidisciplinary
Yating Hu et al.
Summary: The study predicts the existence of hourglass topological band crossings under specific symmetry conditions and predicts hundreds of magnetic materials from the magnetic materials database, providing a new method for manipulating band topology.
Article
Multidisciplinary Sciences
Ding-Fu Shao et al.
Summary: The study reveals the potential of utilizing spin-independent conductance in compensated antiferromagnets and normal metals in spintronics, leading to a significant tunneling magnetoresistance effect. This opens up new possibilities for utilizing materials with no global spin polarization in spintronic devices.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
D. J. Campbell et al.
Summary: FeP is a member of the family of binary pnictide materials with the MnP-type structure, exhibiting an anomalously linear magnetoresistance behavior in high magnetic fields. By comparing quantum oscillation frequencies to electronic structure calculations, a semi-Dirac point related to band structure was identified in this system, which disperses linearly perpendicular to the field direction.
NPJ QUANTUM MATERIALS
(2021)
Article
Physics, Multidisciplinary
T. C. van Thiel et al.
Summary: This study demonstrates how the topological and magnetic features of oxides can be manipulated by engineering charge discontinuities at oxide interfaces. Oxide heterostructures still face challenges in controlling the geometric structure of electronic wave functions, but this approach provides a new pathway for discovering unconventional properties.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Xiaoting Zhou et al.
Summary: The study introduces a new class of TSMs with an unprecedented nodal line landscape centered on a pair of coplanar intersecting concentric ellipses at half-filling. Criteria for the existence of these ellipses in certain spin systems are identified, and specific space groups suitable for hosting them are determined. A simple model showcasing these ellipses and exotic surface states is provided, along with a list of potential material candidates.
Article
Materials Science, Multidisciplinary
J. Bannies et al.
Summary: This study investigates the electronic properties of TMDP ZrP2 using ARPES and magnetotransport techniques, revealing its extremely large magnetoresistance and topological nodal loop. The ARPES measurements and band structure calculations confirm the experimental results, establishing ZrP2 as a platform for studying near-perfect e-h compensation and its interplay with topological band structures.
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Libor Smejkal et al.
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Satoru Hayami et al.
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NEW JOURNAL OF PHYSICS
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EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
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28TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT28)
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REVIEWS OF MODERN PHYSICS
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