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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.00482 |
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| _version_ | 1866914436722196480 |
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| author | Song, Linxuan Zhou, Feng Lu, Guilin Yao, Liang Xi, Xuekui Lau, Yong-Chang Shi, Youguo Wang, Wenhong |
| author_facet | Song, Linxuan Zhou, Feng Lu, Guilin Yao, Liang Xi, Xuekui Lau, Yong-Chang Shi, Youguo Wang, Wenhong |
| contents | We present a systematic study of the structural, magnetic, and transport properties of hexagonal Mn3-xGa alloys, revealing a series of composition-controlled emergent phenomena. By tuning the Mn concentration, we uncover distinct lattice responses, including a zero thermal expansion-like volume compensation behavior in Mn-poor compositions and a magnetoelastic-driven, field-assisted structural phase transition in Mn-rich samples. These lattice instabilities are accompanied by correlated magnetic and transport anomalies, including metamagnetic transitions, negative magnetoresistance, and anomalous Hall sign reversal. First-principles calculations demonstrate that the Hall sign reversal originates from crystal-symmetry breaking rather than magnetic reorientation alone. Our results establish composition as the key control parameter governing magnetoelastic coupling in Mn3-xGa, providing a unified framework to tailor structural, magnetic, and topological transport properties in kagome antiferromagnets and reconcile previously disparate experimental observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_00482 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnetoelastic instabilities in kagome antiferromagnet Mn3-xGa Song, Linxuan Zhou, Feng Lu, Guilin Yao, Liang Xi, Xuekui Lau, Yong-Chang Shi, Youguo Wang, Wenhong Materials Science We present a systematic study of the structural, magnetic, and transport properties of hexagonal Mn3-xGa alloys, revealing a series of composition-controlled emergent phenomena. By tuning the Mn concentration, we uncover distinct lattice responses, including a zero thermal expansion-like volume compensation behavior in Mn-poor compositions and a magnetoelastic-driven, field-assisted structural phase transition in Mn-rich samples. These lattice instabilities are accompanied by correlated magnetic and transport anomalies, including metamagnetic transitions, negative magnetoresistance, and anomalous Hall sign reversal. First-principles calculations demonstrate that the Hall sign reversal originates from crystal-symmetry breaking rather than magnetic reorientation alone. Our results establish composition as the key control parameter governing magnetoelastic coupling in Mn3-xGa, providing a unified framework to tailor structural, magnetic, and topological transport properties in kagome antiferromagnets and reconcile previously disparate experimental observations. |
| title | Magnetoelastic instabilities in kagome antiferromagnet Mn3-xGa |
| topic | Materials Science |
| url | https://arxiv.org/abs/2604.00482 |