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Peer-reviewedCC BYnpj Quantum Materials

Coexistence of liquid-like disordered state and weak ferromagnetism in a s = 1 kagome lattice

  • J. Khatua1
  • Taeyun Kim1
  • Chanhyeon Lee2
  • U. Jena3
  • P. Khuntia3
  • Gyungbin Ban1
  • Y.-S. Choi1
  • Jonas A. Krieger4
  • Thomas J. Hicken4
  • Hubertus Luetkens4
  • Marc Uhlarz5
  • Suyoung Kim6
3 more authors
  • Eundeok Mun6
  • Hiroyuki Nojiri2
  • Kwang-Yong Choi1
6 affiliations
  1. 1Department of Physics, Sungkyunkwan University
  2. 2Institute for Materials Research, Tohoku University
  3. 3Department of Physics, Indian Institute of Technology Madras
  4. 4PSI Center for Neutron and Muon Sciences CNM
  5. 5Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf
  6. 6Department of Physics, Simon Fraser University
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Abstract

Spin-1 kagome lattice antiferromagnets provide a versatile platform for exploring exotic quantum states, such as classical spin liquids and spin nematics, owing to the confluence of geometric frustration, bilinear and biquadratic interactions, and single-ion anisotropy. Here, we investigate the ground state and spin dynamics of a nearly perfect s = 1 kagome lattice, (CH3NH3)2NaV3F12 ( CH 3 NH 3 ) 2 NaV 3 F 12 , which hosts dominant antiferromagnetic interactions (J ≈ 10 K) alongside easy-axis anisotropy. Using a combination of thermodynamic and resonance techniques, we identify the occurrence of weak ferromagnetic ordering at T C ≈ 4 K. Singularly, even in this time-reversal symmetry-breaking state, muon spin relaxation, 23Na spin-lattice relaxation rate, and magnetic specific heat measurements collectively reveal persistent spin dynamics and intriguing gapless excitations. The observation of liquid-like correlations in the ground state establishes (CH3NH3)2NaV3F12 ( CH 3 NH 3 ) 2 NaV 3 F 12 as a rare instance of the coexistence of dynamically fluctuating spins and weak ferromagnetism, raising the possibility of realizing an intriguing ground state in s = 1 kagome antiferromagnets with Ising anisotropy.

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Cite

BibTeXRIS
BibTeX
@article{khatua2026coexistence,
  title = {{Coexistence of liquid-like disordered state and weak ferromagnetism in a s = 1 kagome lattice}},
  author = {J. Khatua and Taeyun Kim and Chanhyeon Lee and U. Jena and P. Khuntia and Gyungbin Ban and Y.-S. Choi and Jonas A. Krieger and Thomas J. Hicken and Hubertus Luetkens and Marc Uhlarz and Suyoung Kim and Eundeok Mun and Hiroyuki Nojiri and Kwang-Yong Choi},
  journal = {npj Quantum Materials},
  year = {2026},
  month = jun,
  doi = {10.1038/s41535-026-00917-0},
  url = {https://doi.org/10.1038/s41535-026-00917-0},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Coexistence of liquid-like disordered state and weak ferromagnetism in a s = 1 kagome lattice
AU  - J. Khatua
AU  - Taeyun Kim
AU  - Chanhyeon Lee
AU  - U. Jena
AU  - P. Khuntia
AU  - Gyungbin Ban
AU  - Y.-S. Choi
AU  - Jonas A. Krieger
AU  - Thomas J. Hicken
AU  - Hubertus Luetkens
AU  - Marc Uhlarz
AU  - Suyoung Kim
AU  - Eundeok Mun
AU  - Hiroyuki Nojiri
AU  - Kwang-Yong Choi
PY  - 2026
DA  - 2026/06/01
JO  - npj Quantum Materials
DO  - 10.1038/s41535-026-00917-0
UR  - https://doi.org/10.1038/s41535-026-00917-0
AB  - Spin-1 kagome lattice antiferromagnets provide a versatile platform for exploring exotic quantum states, such as classical spin liquids and spin nematics, owing to the confluence of geometric frustration, bilinear and biquadratic interactions, and single-ion anisotropy. Here, we investigate the ground state and spin dynamics of a nearly perfect s = 1 kagome lattice, (CH_3NH_3)_2NaV_3F_12 ( CH 3 NH 3 ) 2 NaV 3 F 12 , which hosts dominant antiferromagnetic interactions (J ≈ 10 K) alongside easy-axis anisotropy. Using a combination of thermodynamic and resonance techniques, we identify the occurrence of weak ferromagnetic ordering at T C ≈ 4 K. Singularly, even in this time-reversal symmetry-breaking state, muon spin relaxation, 23Na spin-lattice relaxation rate, and magnetic specific heat measurements collectively reveal persistent spin dynamics and intriguing gapless excitations. The observation of liquid-like correlations in the ground state establishes (CH_3NH_3)_2NaV_3F_12 ( CH 3 NH 3 ) 2 NaV 3 F 12 as a rare instance of the coexistence of dynamically fluctuating spins and weak ferromagnetism, raising the possibility of realizing an intriguing ground state in s = 1 kagome antiferromagnets with Ising anisotropy.
SN  - 2397-4648
ER  -