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PreprintCC BY 4.0arXiv

Thermally Enhanced Pseudo-Goldstone Spin Gap in the Isotropic Helimagnet ZnCr2Se4

  • N. D. Andriushin
  • A. Sanders
  • J. Reuther
  • D. C. Peets
  • P. Steffens
  • A. Hiess
  • J. Lass
  • L. Prodan
  • V. Tsurkan
  • V. Felea
  • D. S. Inosov
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Abstract

In magnetically ordered systems, the spin gap in the magnon spectrum is normally expected to decrease on warming and close at the transition out of the long-range order. The presence of a pseudo-Goldstone gap is commonly associated with nonlinear terms in spin-wave theory. However, its precise origin and detailed properties can vary and remain under debate. Here we show by means of inelastic neutron scattering that the pseudo-Goldstone gap in the Heisenberg helimagnet ZnCr2Se4 exhibits an atypical, nonmonotonic temperature dependence: the gap increases over much of the ordered phase before closing near TN. These results align with recent spin-dynamic simulations based on an effective quartic potential in an isotropic system~[Phys. Rev. B \textbf{113}, L220411 (2026)]. As the pseudo-Goldstone spin gap in ZnCr2Se4 is dominated by quantum effects at subkelvin temperatures, its characteristic growth on warming is caused by thermal fluctuations.

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Cite

BibTeXRIS
BibTeX
@misc{andriushin2026thermally,
  title = {{Thermally Enhanced Pseudo-Goldstone Spin Gap in the Isotropic Helimagnet ZnCr$_2$Se$_4$}},
  author = {N. D. Andriushin and A. Sanders and J. Reuther and D. C. Peets and P. Steffens and A. Hiess and J. Lass and L. Prodan and V. Tsurkan and V. Felea and D. S. Inosov},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.16439},
  eprint = {2610.16439},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.16439},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Thermally Enhanced Pseudo-Goldstone Spin Gap in the Isotropic Helimagnet ZnCr_2Se_4
AU  - N. D. Andriushin
AU  - A. Sanders
AU  - J. Reuther
AU  - D. C. Peets
AU  - P. Steffens
AU  - A. Hiess
AU  - J. Lass
AU  - L. Prodan
AU  - V. Tsurkan
AU  - V. Felea
AU  - D. S. Inosov
PY  - 2026
DA  - 2026/10/12
PB  - arXiv
DO  - 10.48550/arxiv.2610.16439
UR  - https://arxiv.org/abs/2610.16439
AB  - In magnetically ordered systems, the spin gap in the magnon spectrum is normally expected to decrease on warming and close at the transition out of the long-range order. The presence of a pseudo-Goldstone gap is commonly associated with nonlinear terms in spin-wave theory. However, its precise origin and detailed properties can vary and remain under debate. Here we show by means of inelastic neutron scattering that the pseudo-Goldstone gap in the Heisenberg helimagnet ZnCr_2Se_4 exhibits an atypical, nonmonotonic temperature dependence: the gap increases over much of the ordered phase before closing near T_N. These results align with recent spin-dynamic simulations based on an effective quartic potential in an isotropic system~[Phys. Rev. B \textbf{113}, L220411 (2026)]. As the pseudo-Goldstone spin gap in ZnCr_2Se_4 is dominated by quantum effects at subkelvin temperatures, its characteristic growth on warming is caused by thermal fluctuations.
ER  -