Intrinsic Berry Curvature Driven Anomalous Hall and Nernst Effect in Co$_2$MnSn
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| author | Das, Bishal Bhattacharya, Arnab Chanda, Amit Barman, Chanchal K. Nag, Jadupati Srikanth, Hariharan Alam, Aftab Das, I. |
| author_facet | Das, Bishal Bhattacharya, Arnab Chanda, Amit Barman, Chanchal K. Nag, Jadupati Srikanth, Hariharan Alam, Aftab Das, I. |
| contents | Magnetic topological semimetals often exhibit unusual electronic and thermal transport due to nontrivial bulk band crossings, enabling simultaneous realization of large anomalous Hall and Nernst conductivities ($σ_{xy}$ and $α_{xy}$). Here, a comprehensive experimental and theoretical study of the anomalous transport properties of ferromagnetic Co$_2$MnSn is reported. First-principles calculations reveal topological Weyl points producing significant Berry curvature, driving dominant intrinsic anomalous Hall/Nernst effects. Electronic and thermal transport measurements demonstrate robust anomalous transport with substantial conductivity values that persist at room temperature ($σ_{xy}\sim$ 500 S/cm, $α_{xy}\sim$ 1.3 A/m/K). We also show how the chemical substitution (via tuning Fermi level) can boost these effects (up to $σ_{xy}\sim$ 1376 S/cm, $α_{xy}\sim$ 1.49 A/m/K at 150 K). These findings position Co$_2$MnSn as a compelling platform for exploring topological transport phenomena and advancing next-generation thermoelectric and spintronic technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_15644 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Intrinsic Berry Curvature Driven Anomalous Hall and Nernst Effect in Co$_2$MnSn Das, Bishal Bhattacharya, Arnab Chanda, Amit Barman, Chanchal K. Nag, Jadupati Srikanth, Hariharan Alam, Aftab Das, I. Materials Science Other Condensed Matter Strongly Correlated Electrons Magnetic topological semimetals often exhibit unusual electronic and thermal transport due to nontrivial bulk band crossings, enabling simultaneous realization of large anomalous Hall and Nernst conductivities ($σ_{xy}$ and $α_{xy}$). Here, a comprehensive experimental and theoretical study of the anomalous transport properties of ferromagnetic Co$_2$MnSn is reported. First-principles calculations reveal topological Weyl points producing significant Berry curvature, driving dominant intrinsic anomalous Hall/Nernst effects. Electronic and thermal transport measurements demonstrate robust anomalous transport with substantial conductivity values that persist at room temperature ($σ_{xy}\sim$ 500 S/cm, $α_{xy}\sim$ 1.3 A/m/K). We also show how the chemical substitution (via tuning Fermi level) can boost these effects (up to $σ_{xy}\sim$ 1376 S/cm, $α_{xy}\sim$ 1.49 A/m/K at 150 K). These findings position Co$_2$MnSn as a compelling platform for exploring topological transport phenomena and advancing next-generation thermoelectric and spintronic technologies. |
| title | Intrinsic Berry Curvature Driven Anomalous Hall and Nernst Effect in Co$_2$MnSn |
| topic | Materials Science Other Condensed Matter Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.15644 |