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arXiv · 2604.00482

Magnetoelastic instabilities in kagome antiferromagnet Mn3-xGa

Linxuan Song·Feng Zhou·Guilin Lu·Liang Yao·Xuekui Xi·Yong-Chang Lau·Youguo Shi·Wenhong Wang
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Abstract

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.

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Linxuan Song, Feng Zhou, Guilin Lu, Liang Yao, Xuekui Xi, Yong-Chang Lau, Youguo Shi, Wenhong Wang. 2026-04-01. Magnetoelastic instabilities in kagome antiferromagnet Mn3-xGa. https://arxiv.org/abs/2604.00482

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