Anomalous Hall effect from gapped nodal line in the 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>FeGe</mml:mi></mml:mrow></mml:math>
 Heusler compound

Shukla, Gaurav; Sau, Jyotirmoy; Shahi, Nisha; Singh, A. K.; Kumar, Manoranjan; Singh, Sanjay

doi:10.1103/physrevb.104.195108

Cited by 28 publications

(17 citation statements)

References 70 publications

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“…At the Fermi energy, we observed a giant intrinsic AHC (σ A z ), which is about 1143 S cm −2 . The AHC value is comparable to the largest AHC observed in the Co 2 MnGa [36] and much larger than the other compounds of the Heusler family [38,[62][63][64].…”

Section: Anomalous Hall Effectsupporting

confidence: 52%

“…The family of Heusler compounds is considerably large comprising more than 1000 members and can display paramagnetic, ferromagnetic and antiferromagnetic properties and fascinating anomalous electric, thermal and thermoelectric transport properties [37]. The AHC has been reported to be intrinsic in several Heusler compounds such as Co 2 CrGa, Co 2 VAl,Co 2 FeGe,Co 2 MnGa [8,29,36,38,39]. The major challenge in these compounds is to design Heusler compounds with large anomalous transport properties and their tunability of intrinsic anomalous behavior i.e.…”

Section: Introductionmentioning

confidence: 99%

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Hydrostatic pressure-induced anomalous hall effect in Co₂FeSi semimetal

Sau,

Sa,

Kumar

2024

Electron. Struct.

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The Weyl points and nodal line emerge in the momentum space due to symmetry protected state in topological semimetal(TSM) materials and these materials hold significance due to their unusual anomalous transport properties. In this manuscript, we study the topological properties of the electronic band structure of a half-metallic ferromagnet Co$_{2}$FeSi employing the ab-initio DFT method and show that it is a strongly correlated material. The experimentally observed magnetic properties can be explained in terms of the Slater-Pauling (SP) rule and our calculations are consistent with it. We also investigate the band topology of Co$_{2}$FeSi and find that there are three topological nodal lines at 380 meV above Fermi Energy (\textit{E$_F$}). The degeneracy of these nodal lines is perturbed upon introducing spin-orbit coupling with magnetization along [001] direction. However, some points still preserve degeneracy and are identified as Weyl points, each associated with a specific Chern number. At the ambient pressure, the AHC properties of this material have only extrinsic contribution which is consistent with the experimental results. To make the AHC intrinsic, we tune the position of the nodal line close to the Fermi energy by applying the hydrostatic pressure up to 26 GPa. We also discuss crystal symmetries and their relation with nodal lines and Weyl points.

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Section: Anomalous Hall Effectsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Hydrostatic pressure-induced anomalous hall effect in Co₂FeSi semimetal

Sau,

Sa,

Kumar

2024

Electron. Struct.

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“…3(f). From such a representation 33,50 and the observation of nearly temperature independent σ AHE xy , we get further evidence of intrinsically dominating AHC. We note that almost same temperature-dependent behavior is shown by the saturation magnetization M S in Fig.…”

Section: Resultsmentioning

confidence: 68%

Intrinsically dominated anomalous Hall effect in pulsed laser deposited epitaxial Co₂MnGe ferromagnetic full Heusler alloy thin films

Yadav,

Kumar

2023

RSC Adv.

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“…[ 45,46 ] The anomalous Hall conductivity (AHC) is a useful parameter for characterizing AHE in magnetic materials. We calculated AHC using the relation [ 47,48 ]

\left(\sigma\right)_{\text{AH}} = \frac{\left(\rho\right)^{2} _{\text{AH}}}{\left(\rho\right)^{2} _{X X} + \left(\rho\right)^{2} _{\text{AH}}}

…”

Section: Resultsmentioning

confidence: 99%

“…[45,46] The anomalous Hall conductivity (AHC) is a useful parameter for characterizing AHE in magnetic materials. We calculated AHC using the relation [47,48]…”

Section: Transport Measurementsmentioning

confidence: 99%

Topological Hall Effect in (Mn_1−xFe_x)_3.25Ge (x = 0.4) Hexagonal Magnet

Kumar

Shukla

Shahi

et al. 2023

Physica Rapid Research Ltrs

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Topologically protected nontrivial spin structures attract significant interest in condensed matter physics for their utilization in low‐power‐consumption spintronics devices, memory devices, etc. The topological Hall effect (THE) is an additional Hall resistivity in the system arising from real‐space Berry curvature picked up by conduction electron passing through the nontrivial spin texture. Compared to expensive neutron diffraction measurements, THE is often used as a cost‐effective tool to investigate nontrivial spin texture in the materials. In the present manuscript, THE in the (Mn1−xFex)3.25Ge (x = 0.4) alloy is studied using magneto‐transport measurements. Maximum THE is found in the system about 0.65 μΩ cm at 150 K, which is in contrast to the pristine Mn3Ge that has zero THE. The strong temperature variation of THE suggests that the noncoplanar spin structure due to competition among the magneto‐crystalline anisotropy, antiferromagnetic coupling, and ferromagnetic exchange interaction is the main source of THE in the present system. Herein, it is shown that chemical doping can be an effective way to induce THE in the material with vanishing THE in its parent phase.

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Anomalous Hall effect from gapped nodal line in the Co2FeGe Heusler compound

Cited by 28 publications

References 70 publications

Hydrostatic pressure-induced anomalous hall effect in Co₂FeSi semimetal

Hydrostatic pressure-induced anomalous hall effect in Co₂FeSi semimetal

Intrinsically dominated anomalous Hall effect in pulsed laser deposited epitaxial Co₂MnGe ferromagnetic full Heusler alloy thin films

Topological Hall Effect in (Mn_1−xFe_x)_3.25Ge (x = 0.4) Hexagonal Magnet

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Anomalous Hall effect from gapped nodal line in the Co2FeGe Heusler compound

Cited by 28 publications

References 70 publications

Hydrostatic pressure-induced anomalous hall effect in Co2FeSi semimetal

Hydrostatic pressure-induced anomalous hall effect in Co2FeSi semimetal

Intrinsically dominated anomalous Hall effect in pulsed laser deposited epitaxial Co2MnGe ferromagnetic full Heusler alloy thin films

Topological Hall Effect in (Mn1−xFex)3.25Ge (x = 0.4) Hexagonal Magnet

Contact Info

Product

Resources

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Hydrostatic pressure-induced anomalous hall effect in Co₂FeSi semimetal

Hydrostatic pressure-induced anomalous hall effect in Co₂FeSi semimetal

Intrinsically dominated anomalous Hall effect in pulsed laser deposited epitaxial Co₂MnGe ferromagnetic full Heusler alloy thin films

Topological Hall Effect in (Mn_1−xFe_x)_3.25Ge (x = 0.4) Hexagonal Magnet