Thermodynamic Evidence for Multiple Field-Induced Phases in an Anisotropic Kagome Antiferromagnet

Abstract

Kagome antiferromagnets are predicted to host exotic field-induced phases, yet experimental identification of their thermodynamic signatures remains challenging. Here we combine specific heat (C) and ultrasound measurements up to 36 T and down to 0.5 K to map the H−T phase diagram of the anisotropic kagome magnet Y₃Cu₉(OH)₁₉Cl₈. We show that the suppression of long-range antiferromagnetic order with field at ∼ 15 T approximately coincides with the onset of the unconventional 1/6 (or 1/9) magnetization plateau previously observed in this system. The attenuation (and sound velocity) then intriguingly increases down to 0.5 K just at μ₀H = 15 T, and C/T becomes temperature independent. Moreover, our measurements are consistent with the opening of a spin gap Δ₀≃3.5± 0.3 K within the plateau and reveal a further compressible (ungapped) phase beyond the plateau phase, unveiling a rich sequence of field-induced phases in this quantum magnet.

Thermodynamic origin of the phonon Hall effect in a honeycomb antiferromagnet
Qingkai Meng, Xiaokang Li, Jie Liu +5
Science22 Oct 2026Peer-reviewedPublisher termsFull textCondensed matterHAL
A thermodynamic reference for field-induced phenomena in α-RuCl₃: two coexisting polymorphs account for multiple magnetic phase transitions
Hamza Nasir, Daniel Balazs, Muhammad Nauman +5
arXiv3 Oct 2026PreprintCC BY 4.0Full textCondensed matterarXiv
Electric field control of anisotropic spin traffic between spin-filtering and magnon-scattering in a layered antiferromagnet
Mohamed Soliman, Jaime Garrido Aldea, Davy Borowski +12
arXiv29 Oct 2026PreprintCC BY 4.0Full textComputational physics Condensed matterarXiv
Anisotropic Nanoparticle Rejamming Triggers Thermodynamic Cavitation in Elastomer Nanocomposites
Harshad Bhapkar, Pierre Kawak, David S. Simmons
arXiv13 Sep 2026PreprintCC BY-NC-ND 4.0Full textCondensed matterarXiv
Anisotropic magneto-elastic coupling in the quasi-2D Ising magnet Li₂FeSiO₄ and thermodynamic signature of low-energy orbital excitations
Waldemar Hergett, Kevin Ackermann, Sven Spachmann +6
arXiv26 Oct 2026PreprintCC BY-NC-ND 4.0Full textCondensed matterarXiv

Cite

BibTeX RIS

BibTeX

@misc{schuchard2026thermodynamic,
  title = {{Thermodynamic Evidence for Multiple Field-Induced Phases in an Anisotropic Kagome Antiferromagnet}},
  author = {M. Schuchard and Q. Barthélemy and C. Marcenat and N. Wack and P. Puphal and A. De Muer and D. LeBoeuf and T. Klein},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.04675},
  eprint = {2611.04675},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.04675},
  note = {CC BY-SA 4.0},
}

RIS

TY  - UNPB
TI  - Thermodynamic Evidence for Multiple Field-Induced Phases in an Anisotropic Kagome Antiferromagnet
AU  - M. Schuchard
AU  - Q. Barthélemy
AU  - C. Marcenat
AU  - N. Wack
AU  - P. Puphal
AU  - A. De Muer
AU  - D. LeBoeuf
AU  - T. Klein
PY  - 2026
DA  - 2026/11/03
PB  - arXiv
DO  - 10.48550/arxiv.2611.04675
UR  - https://arxiv.org/abs/2611.04675
AB  - Kagome antiferromagnets are predicted to host exotic field-induced phases, yet experimental identification of their thermodynamic signatures remains challenging. Here we combine specific heat (C) and ultrasound measurements up to 36 T and down to 0.5 K to map the H−T phase diagram of the anisotropic kagome magnet Y_3Cu_9(OH)_19Cl_8. We show that the suppression of long-range antiferromagnetic order with field at ∼ 15 T approximately coincides with the onset of the unconventional 1/6 (or 1/9) magnetization plateau previously observed in this system. The attenuation (and sound velocity) then intriguingly increases down to 0.5 K just at μ_0H = 15 T, and C/T becomes temperature independent. Moreover, our measurements are consistent with the opening of a spin gap Δ_0≃3.5± 0.3 K within the plateau and reveal a further compressible (ungapped) phase beyond the plateau phase, unveiling a rich sequence of field-induced phases in this quantum magnet.
ER  -

Abstract

Related

Cite