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PreprintCC BY 4.0arXiv

Field-driven phase transition crossover in kagome antiferromagnet Mn3−xCoxSn

  • Shubhankar Paul
  • Chanchal Sow
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Abstract

Mn3Sn exhibits a complex magnetic phase diagram with multiple symmetry-breaking phenomena. Minute electron doping at the Mn site breaks the kagome lattice symmetry in Mn3Sn. In this work, we exploited this to tune the order of the magnetic phase transition using magnetocaloric effect in Mn3−xCoxSn single crystals. Pristine Mn3Sn shows metallic behaviour with a spin-reorientation transition at 278 K, which shifts to 175 K upon Co doping. Additionally, Co doping also induces a weak-ferromagnetic transition near ≈ 210 K. The effect of Co doping results inverse to conventional magnetocaloric effect, with enhanced magnetic entropy change. Further, the scaled entropy change reveals a field-driven magnetic phase transition crossover from first order to second order in Mn2.75Co0.25Sn crystal. Based on experimental data, a new phase diagram is constructed, depicting the field evolution of various magnetic orders.

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Cite

BibTeXRIS
BibTeX
@misc{paul2026fielddriven,
  title = {{Field-driven phase transition crossover in kagome antiferromagnet Mn$_3-x$Co$_x$Sn}},
  author = {Shubhankar Paul and Chanchal Sow},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.16189},
  eprint = {2610.16189},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.16189},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Field-driven phase transition crossover in kagome antiferromagnet Mn_3−xCo_xSn
AU  - Shubhankar Paul
AU  - Chanchal Sow
PY  - 2026
DA  - 2026/10/12
PB  - arXiv
DO  - 10.48550/arxiv.2610.16189
UR  - https://arxiv.org/abs/2610.16189
AB  - Mn_3Sn exhibits a complex magnetic phase diagram with multiple symmetry-breaking phenomena. Minute electron doping at the Mn site breaks the kagome lattice symmetry in Mn_3Sn. In this work, we exploited this to tune the order of the magnetic phase transition using magnetocaloric effect in Mn_3−xCo_xSn single crystals. Pristine Mn_3Sn shows metallic behaviour with a spin-reorientation transition at 278 K, which shifts to 175 K upon Co doping. Additionally, Co doping also induces a weak-ferromagnetic transition near ≈ 210 K. The effect of Co doping results inverse to conventional magnetocaloric effect, with enhanced magnetic entropy change. Further, the scaled entropy change reveals a field-driven magnetic phase transition crossover from first order to second order in Mn_2.75Co_0.25Sn crystal. Based on experimental data, a new phase diagram is constructed, depicting the field evolution of various magnetic orders.
ER  -