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PreprintarXiv licencearXiv

Microscopic magnetic phase evolution in the Weyl semimetal Mn3Sn revealed by μ+SR

  • U. Miniotaite
  • O. K. Forslund
  • H. Luetkens
  • V. Rai
  • J. Persson
  • G. D. Morris
  • D. Zuhair
  • D. W. Tam
  • S. Nandi
  • Y. Sassa
  • M. Månsson
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Abstract

We report a comprehensive muon spin relaxation (μ+SR) and bulk magnetization study of the antiferromagnetic (AFM) Weyl semimetal Mn3Sn (composition Mn2.99Sn). Mn$3$Sn is reported to exhibit a commensurate inverse triangular (IT) AFM phase, an incommensurate (IC) helical AFM phase, and a proposed low-temperature spin-glass-like state. In our sample, we identify the characteristic temperatures associated with these regimes as N'eel temperature (TN = 418 K), a macroscopic bulk transition temperature between IT-AFM to IC helical phase (Tt ≈ 275 K), and low-temperature transition Tf = 21 K. Investigating the low-temperature regime below Tf, we find no evidence of a static spin-glass state. Instead, the sample exhibits an increasing ferromagnetic (FM) component accompanied by a localized slowing of spin fluctuations, indicating that these phenomena may be decoupled. In the IC helical AFM phase, the zero-field (ZF) spectra are best described by damped oscillations with an empirical phase offset, consistent with anharmonic and amplitude-modulated order reported by scattering studies. Upon warming above 150 K, a continuous redistribution of muon spectral weight reveals a broad, homogeneous magnetic crossover between the IC helical and IT-AFM phases. In the commensurate IT-AFM phase above Tt, a persistent missing fraction in the initial asymmetry indicates that a subset of implanted muons, corresponding to roughly 20% of the sample-related asymmetry, undergoes unresolved ultrafast depolarization. Finally, we observe temperature-driven shifts in muon site populations above 325 K. Ultimately, our results show a highly dynamic magnetic landscape in Mn3Sn, demonstrating how its complex magnetic orders often coexist and evolve continuously with temperature.

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Cite

BibTeXRIS
BibTeX
@misc{miniotaite2026microscopic,
  title = {{Microscopic magnetic phase evolution in the Weyl semimetal Mn$_3$Sn revealed by $μ^+$SR}},
  author = {U. Miniotaite and O. K. Forslund and H. Luetkens and V. Rai and J. Persson and G. D. Morris and D. Zuhair and D. W. Tam and S. Nandi and Y. Sassa and M. Månsson},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.01892},
  eprint = {2608.01892},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.01892},
}
RIS
TY  - UNPB
TI  - Microscopic magnetic phase evolution in the Weyl semimetal Mn_3Sn revealed by μ^+SR
AU  - U. Miniotaite
AU  - O. K. Forslund
AU  - H. Luetkens
AU  - V. Rai
AU  - J. Persson
AU  - G. D. Morris
AU  - D. Zuhair
AU  - D. W. Tam
AU  - S. Nandi
AU  - Y. Sassa
AU  - M. Månsson
PY  - 2026
DA  - 2026/08/28
PB  - arXiv
DO  - 10.48550/arxiv.2608.01892
UR  - https://arxiv.org/abs/2608.01892
AB  - We report a comprehensive muon spin relaxation (μ^+SR) and bulk magnetization study of the antiferromagnetic (AFM) Weyl semimetal Mn_3Sn (composition Mn2.99Sn). Mn$3$Sn is reported to exhibit a commensurate inverse triangular (IT) AFM phase, an incommensurate (IC) helical AFM phase, and a proposed low-temperature spin-glass-like state. In our sample, we identify the characteristic temperatures associated with these regimes as N'eel temperature (TN = 418 K), a macroscopic bulk transition temperature between IT-AFM to IC helical phase (Tt ≈ 275 K), and low-temperature transition T_f = 21 K. Investigating the low-temperature regime below T_f, we find no evidence of a static spin-glass state. Instead, the sample exhibits an increasing ferromagnetic (FM) component accompanied by a localized slowing of spin fluctuations, indicating that these phenomena may be decoupled. In the IC helical AFM phase, the zero-field (ZF) spectra are best described by damped oscillations with an empirical phase offset, consistent with anharmonic and amplitude-modulated order reported by scattering studies. Upon warming above 150 K, a continuous redistribution of muon spectral weight reveals a broad, homogeneous magnetic crossover between the IC helical and IT-AFM phases. In the commensurate IT-AFM phase above T_t, a persistent missing fraction in the initial asymmetry indicates that a subset of implanted muons, corresponding to roughly 20% of the sample-related asymmetry, undergoes unresolved ultrafast depolarization. Finally, we observe temperature-driven shifts in muon site populations above 325 K. Ultimately, our results show a highly dynamic magnetic landscape in Mn_3Sn, demonstrating how its complex magnetic orders often coexist and evolve continuously with temperature.
ER  -