Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal (2024)

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  • Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal (2024)

    FAQs

    What is the ferromagnetic Kagome lattice? ›

    In solid-state physics, the kagome metal or kagome magnet is a type of ferromagnetic quantum material. The atomic lattice in a kagome magnet has layered overlapping triangles and large hexagonal voids, akin to the kagome pattern in traditional Japanese basket-weaving.

    What is the anomalous hall effect in a collinear antiferromagnet? ›

    To date, an anomalous Hall current in collinear antiferromagnets has been experimentally identified only as a consequence of canting of the magnetic moments by an applied magnetic field, or due to a field-induced spin-flip transition into a ferromagnetic state6,25,26.

    What is the anomalous hall effect in magnetization? ›

    When magnetic field is applied to a metal in which current is flowing, a transverse electrical current appears. This is the so-called classical Hall effect. In some magnetic materials a transverse current appears even in absence of external magnetic field, an effect known as the anomalous Hall effect (AHE)1.

    What is the quantum anomalous hall effect in topological insulators? ›

    The quantum Hall (QH) effect, quantized Hall resistance combined with zero longitudinal resistance, is the characteristic experimental fingerprint of Chern insulators - topologically non-trivial states of two-dimensional matter with broken time-reversal symmetry.

    What is a kagome lattice? ›

    The Kagome lattice consists of corner-sharing triangles and is characterised by a large degree of geometric frustration, which becomes visible for instance in an antiferromagnetic Heisenberg model: while two of the three spins can be antiparallel, the third one is frustrated—both possible configurations will always ...

    What are the materials in kagome lattice? ›

    Here, there are mainly two categories of kagome materials: magnetic kagome materials and nonmagnetic ones. On one hand, magnetic kagome materials mainly focus on the 3d transition-metal-based kagome systems, including Fe3Sn2, Co3Sn2S2, YMn6Sn6, FeSn, and CoSn.

    What is the difference between Hall effect and anomalous Hall effect? ›

    In ferromagnetic materials (and paramagnetic materials in a magnetic field), the Hall resistivity includes an additional contribution, known as the anomalous Hall effect (or the extraordinary Hall effect), which depends directly on the magnetization of the material, and is often much larger than the ordinary Hall ...

    What is the equation for the anomalous Hall effect? ›

    As discussed in the introduction, the Hall resistivity of a ferromagnet is described by ρxy = RoB + Rs4πM, where the second term is the anomalous contribution to the Hall resistivity.

    What is Hall effect in ferromagnetic materials? ›

    Synopsis. Apart from the normal Hall voltage a magnetized ferromagnetic material usually shows a relatively large extra voltage in the same direction, which can be found by linear extrapolation to B=O. It is shown that this spontaneous Hall effect cannot exist in a perfectly periodic lattice.

    What is the difference between Hall effect and quantum Hall effect? ›

    The quantum Hall effect is derived from the classical Hall effect. The key difference between Hall effect and quantum Hall effect is that the Hall effect mainly occurs on semiconductors, whereas the quantum Hall effect takes place mainly in metals.

    What causes the quantum Hall effect? ›

    5.2 Quantum Hall Effect. The Quantum Hall effect is a phenomena exhibited by 2D materials, and can also be found in graphene [42]. When electrons in a 2D material at very low temperature are subjected to a magnetic field, they follow cyclotron orbits with a radius inversely proportional to the magnetic field intensity.

    What is the role of disorder in the quantum Hall effect? ›

    On this picture, disorder both broadens the Landau levels and gives states varying character as a function of energy within each Landau level: states in the Landau level tails are localised in space, while those at the Landau level centre extend through the sample.

    What is the Bravais lattice of Kagome? ›

    The kagome lattice is a triangular Bravais lattice with a 3-point basis labelled l = 1, 2, 3; a1 = ˆ x and a2 = (ˆ x + √ 3ˆy3ˆy)/2 are the basis vectors. In the metallic kagome lattice F e3Sn2, spin-orbit coupling arises from the electric field due to the Sn ion at the center of the hexagon.

    What is superconductivity in kagome lattice? ›

    It has been argued that the kagome lattice can host a variety of unconventional pairing superconducting states, including the d + id chiral superconductor (SC) [26–28] and f-wave spin-triplet SC [29], among others. However, superconducting kagome materials are rare in nature.

    What is ferromagnetic crystal? ›

    Ferromagnet crystals have the magnetic moments from all their constituent ions aligned in the same direction; the magnetic moment of the crystal is the summation of the individual moments of the ions. There must be a magnetic force between the different ions that causes them to cooperatively align their moments.

    What is kagome? ›

    Kagome may refer to: Kagome lattice, a two-dimensional lattice pattern found in the crystal structure of many natural minerals. Kagome crest, a star shaped symbol related to the lattice design and present in many Shinto shrines. Kagome Kagome, a popular children's game in Japan.

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