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 ferromagnetic quantum anomalous hall effect? ›

    The quantum anomalous Hall effect (QAHE), featured by a quantized Hall conductance at zero magnetic field and the topologically protected chiral edge states, has been widely studied in recent years [1–3].

    What is anomalous Hall effect? ›

    The anomalous Hall effect is a related phenomenon that happens in some magnetic materials. In this case, no external magnetic field needs to be applied since the material supplies the magnetic field. But the cause of the anomalous Hall effect seems to vary between materials.

    What is the Hall effect of ferromagnets? ›

    Both the unusually large magnitude and strong temperature dependence of the extraordinary Hall effect in ferromagnetic materials can be understood as effects of the spin-orbit interaction of polarized conduction electrons.

    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 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.

    Why is the quantum Hall effect important? ›

    The quantum Hall effect also provides an extremely precise independent determination of the fine-structure constant, a quantity of fundamental importance in quantum electrodynamics.

    What is the anomalous effect? ›

    The anomalous photovoltaic effect (APE) is a type of a photovoltaic effect which occurs in certain semiconductors and insulators. The "anomalous" refers to those cases where the photovoltage (i.e., the open-circuit voltage caused by the light) is larger than the band gap of the corresponding semiconductor.

    What is the main cause of Hall effect? ›

    The Hall effect is the deflection of electrons (holes) in an n-type (p-type) semiconductor with current flowing perpendicular to a magnetic field. The deflection of these charged carriers sets up a voltage, called the Hall voltage, whose polarity depends on the effective charge of the carrier.

    What does the Hall effect tell us? ›

    Hall effect is used to determine if a substance is a semiconductor or an insulator. The nature of the charge carriers can be measured.

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

    While electrons moving through a conventional conductor heat up the atomic lattice and thus lose energy, in materials with anomalous Hall effect the electrons can move without losing their energy – at least in a transverse direction to the applied voltage.

    What is the difference between the Hall effect and the Lorentz force? ›

    The Hall effect is due to the nature of the current in a conductor. Current consists of the movement of many small charge carriers, typically electrons, holes, ions (see Electromigration) or all three. When a magnetic field is present, these charges experience a force, called the Lorentz force.

    What is the ferromagnetic effect? ›

    In ferromagnetism, the magnetic moments point in the same direction. Due to this, the magnetic susceptibility of a substance increases to a great extent. Ferromagnetism is observed in transition metals and some of their compounds. In antiferromagnetism, the magnetic moments point in the opposite direction.

    Is Hall effect possible in metals? ›

    Historically, the Hall effect was used to show that electrons carry current in metals and it also shows that positive charges carry current in some semiconductors. The Hall effect is used today as a research tool to probe the movement of charges, their drift velocities and densities, and so on, in materials.

    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 the magnetic lattice structure? ›

    The magnetic structure is an incommensurate modulated 2D structure with q = 0.4 along the c-axis (Selte et al., 1972). Rodriguez et al. (2011) reported results from neutron powder diffraction (NPD) studies of FeAs, yielding an incommensurate modulated spin structure with q = 0.395 along the c-axis at 4 K.

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