Large Topological Hall Effect and Spiral Magnetic Order in the Weyl Semimetal SmAlSi

Yao, Xiaohan; Gaudet, Jonathan; Verma, R. P.; Graf, David; Yang, Hung‐Yu; Bahrami, Faranak; Zhang, Ruiqi; Aczel, A. A.; Subedi, Sujan; Torchinsky, Darius; Sun, Jianwei; Bansil, Arun; Huang, Shin-Ming; Singh, Bahadur; Blaha, Peter; Nikolić, Predrag; Tafti, Fazel

doi:10.1103/physrevx.13.011035

Cited by 17 publications

(12 citation statements)

References 35 publications

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“…The contour mapping shows that a large ρ T persists up to room temperature around the field of 0.1 T and it converges to zero above the field of %0.3 T. Such behavior has been observed in similar systems due to fully spin-polarized state at higher magnetic field. [24,25,30,[33][34][35][38][39][40]42] The comparison with the previously reported bulk systems [4,12,19,30,35,[59][60][61][62][63][64][65][66][67][68][69][70] (Figure 2e) indicates that the large topological Hall persists in the wider temperature range of 2-300 K, which make the Mn 2 CoAl compound an ideal candidate for the spintronic applications. The moderate decrease in the maximum ρ T with temperature can be ascribed to the microscopic noncoplanar spin texture.…”

Section: Topological Hall Analysissupporting

confidence: 64%

“…d) Contour plot of ρ T as a function of temperature and magnetic field. e) Comparison of |ρ T | m obtained in the present study with previously reported values [4,12,19,30,35,[59][60][61][62][63][64][65][66][67][68][69][70]. The variations in topological Hall resistivity have been listed with respect to temperature.…”

supporting

confidence: 60%

“…e) Comparison of |

\left(\rho\right)_{\text{T}}

_{\text{m}}

obtained in the present study with previously reported values. [ 4,12,19,30,35,59–70 ] The variations in topological Hall resistivity have been listed with respect to temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Previous theoretical studies on the Mn 2 CoAl compound suggest antiferromagnetic intra-sublattice (Mn-Mn and Co-Co) interactions, along with ferro-and antiferromagnetic-type [4,12,19,30,35,[59][60][61][62][63][64][65][66][67][68][69][70] The variations in topological Hall resistivity have been listed with respect to temperature. inter-sublattice interactions (involving interaction of Co with Mn at 4c [0.25, 0.25, 0.25] and 4a [0, 0, 0] sites, respectively).…”

Section: Ac-susceptibility Measurementmentioning

confidence: 99%

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Possible Topological Hall Effect in a Spin Gapless Semiconducting Mn₂CoAl Heusler Compound

Shahi,

Rastogi,

Singh

2023

Physica Rapid Research Ltrs

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Topological Hall effect (THE), induced by the interaction of charge carriers with mesoscopic or microscopic non‐coplanar spin structures, holds promising applications in the field of spintronics. In the present study, we report a giant THE of about 2 μΩ‐cm at room temperature in a bulk spin gapless semiconducting Mn2CoAl cubic Heusler compound. Temperature dependent investigation of magneto‐transport data reveals that the Mn2CoAl has the large THE over a wide temperature range of 2‐300 K. The AC susceptibility as a function of magnetic field exhibits a smooth and continuous response rather than any kink or anomaly, suggests that the observed THE in the Mn2CoAl compound results from the interaction of charge carriers with the microscopic non‐coplanar spin texture. The observed THE as a function of temperature follows the same behavior as the magnetocrystalline anisotropy (MCA) of the cubic Mn2CoAl, indicating the competition of the MCA with ferromagnetic and antiferromagnetic exchange interactions as the origin of the non‐coplanar spin texture and hence THE. Micromagnetic simulations further support the emergence of non‐coplanar spin structure as a result of the competition between different energies.This article is protected by copyright. All rights reserved.

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Section: Topological Hall Analysissupporting

confidence: 64%

supporting

confidence: 60%

“…e) Comparison of |

\left(\rho\right)_{\text{T}}

_{\text{m}}

obtained in the present study with previously reported values. [ 4,12,19,30,35,59–70 ] The variations in topological Hall resistivity have been listed with respect to temperature.…”

Section: Resultsmentioning

confidence: 99%

Section: Ac-susceptibility Measurementmentioning

confidence: 99%

See 2 more Smart Citations

Possible Topological Hall Effect in a Spin Gapless Semiconducting Mn₂CoAl Heusler Compound

Shahi,

Rastogi,

Singh

2023

Physica Rapid Research Ltrs

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“…The magnetic structure of the RAlX family is easy to regulate and presents diverse magnetic ordering. For example, the magnetic structure of RAlX can be nonmagnetic [64][65][66], ferromagnetic [38][39][40][41][42][43][44][45][46][47][48][49], antiferromagnetic [49][50][51][52][53][54][55][56], ferrimagnetic [57][58][59][60] and even spiral magnetic [57,61] by rare earth element substitution. Such a rich magnetic structure makes the RAlX family an appropriate candidate to study the interaction between magnetism and Weyl fermions.…”

mentioning

confidence: 99%

Ferrimagnetic Regulation of Weyl Fermions in a Noncentrosymmetric Magnetic Weyl Semimetal

Zhang

Wang

et al. 2023

Preprint

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The study of interaction between electromagnetism and elementary particles is a long-standing topic in physics. Likewise, the connection between particle physics and emergent phenomena in condensed matter physics is a recurring theme and condensed matter physics has often provided a platform for investigating the interplay between particles and fields in cases that have not been observed in high-energy physics, so far. Here, using angle-resolved photoemission spectroscopy, we provide a new example of this by visualizing the electronic structure of a noncentrosymmetric magnetic Weyl semimetal candidate NdAlSi in both the paramagnetic and ferrimagnetic states. We observe surface Fermi arcs and bulk Weyl fermion dispersion as well as the regulation of Weyl fermions by ferrimagnetism. Our results establish NdAlSi as a magnetic Weyl semimetal and provide the first experimental observation of ferrimagnetic regulation of Weyl fermions in condensed matter.

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Engineering Anomalously Large Electron Transport in Topological Semimetals

Plisson,

Yao,

Wang

et al. 2024

Advanced Materials

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Anomalous transport of topological semimetals has generated significant interest for applications in optoelectronics, nanoscale devices, and interconnects. Understanding the origin of novel transport is crucial to engineering the desired material properties, yet their orders of magnitude higher transport than single‐particle mobilities remain unexplained. This work demonstrates the dramatic mobility enhancements result from phonons primarily returning momentum to electrons due to phonon‐electron dominating over phonon‐phonon scattering. Proving this idea, proposed by Peierls in 1932, requires tuning electron and phonon dispersions without changing symmetry, topology, or disorder. This is achieved by combining de Haas ‐ van Alphen (dHvA), electron transport, Raman scattering, and first‐principles calculations in the topological semimetals MX2 (M = Nb, Ta and X = Ge, Si). Replacing Ge with Si brings the transport mobilities from an order magnitude larger than single particle ones to nearly balanced. This occurs without changing the crystal structure or topology and with small differences in disorder or Fermi surface. Simultaneously, Raman scattering and first‐principles calculations establish phonon‐electron dominated scattering only in the MGe2 compounds. Thus, this study proves that phonon‐drag is crucial to the transport properties of topological semimetals and provides insight to engineer these materials further.This article is protected by copyright. All rights reserved

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Large Topological Hall Effect and Spiral Magnetic Order in the Weyl Semimetal SmAlSi

Cited by 17 publications

References 35 publications

Possible Topological Hall Effect in a Spin Gapless Semiconducting Mn₂CoAl Heusler Compound

Possible Topological Hall Effect in a Spin Gapless Semiconducting Mn₂CoAl Heusler Compound

Ferrimagnetic Regulation of Weyl Fermions in a Noncentrosymmetric Magnetic Weyl Semimetal

Engineering Anomalously Large Electron Transport in Topological Semimetals

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Large Topological Hall Effect and Spiral Magnetic Order in the Weyl Semimetal SmAlSi

Cited by 17 publications

References 35 publications

Possible Topological Hall Effect in a Spin Gapless Semiconducting Mn2CoAl Heusler Compound

Possible Topological Hall Effect in a Spin Gapless Semiconducting Mn2CoAl Heusler Compound

Ferrimagnetic Regulation of Weyl Fermions in a Noncentrosymmetric Magnetic Weyl Semimetal

Engineering Anomalously Large Electron Transport in Topological Semimetals

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Product

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Possible Topological Hall Effect in a Spin Gapless Semiconducting Mn₂CoAl Heusler Compound

Possible Topological Hall Effect in a Spin Gapless Semiconducting Mn₂CoAl Heusler Compound