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Peer-reviewedCC BY 4.0Physical Review B

Interplay of disorder and spin liquid physics in the triangular-lattice antiferromagnet YbZn 2 GaO 5

  • Hafsa Zeroual
  • Shams Sohel Islam
  • Toni Shiroka
  • Thomas James Hicken
  • Rabindranath Bag
  • Sara Haravifard
  • Hubertus Luetkens
  • Philippe Mendels
  • Edwin Kermarrec
  • Fabrice Bert
Open at sourcePDFDOICite

Abstract

YbZn2GaO5 has recently emerged as a structurally ideal triangular-lattice antiferromagnet and a promising candidate for hosting a U(1) Dirac quantum spin-liquid (QSL) ground state. However, signatures of broadened crystal electric field (CEF) excitations have raised questions about potential site disorder and its impact on the intrinsic spin dynamics. In this study, we employ 71Ga nuclear magnetic resonance (NMR) and muon spin relaxation (muSR) to microscopically probe both the structural and magnetic properties of YbZn2GaO5. NMR spectra reveal two inequivalent 71Ga sites and a broad distribution of quadrupolar frequencies, providing clear evidence of Ga3+/Zn2+ site mixing and local CEF randomness. The NMR spin-lattice relaxation rate exhibits, down to 1.3~K, a power-law temperature dependence, consistent with persisting spin dynamics below the exchange energy scale in a frustrated magnet. Complementary muSR measurements further show that the spin dynamics persist down to 30mK, with no signs of spin freezing. Together, these results establish that YbZn2GaO5 presents substantial structural disorder, while the persistence of dynamic spin fluctuations down to the lowest temperatures may indicate the survival of QSL-like excitations despite such disorder.

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Cite

BibTeXRIS
BibTeX
@article{zeroual2026interplay,
  title = {{Interplay of disorder and spin liquid physics in the triangular-lattice antiferromagnet YbZn 2 GaO 5}},
  author = {Hafsa Zeroual and Shams Sohel Islam and Toni Shiroka and Thomas James Hicken and Rabindranath Bag and Sara Haravifard and Hubertus Luetkens and Philippe Mendels and Edwin Kermarrec and Fabrice Bert},
  journal = {Physical Review B},
  year = {2026},
  month = aug,
  doi = {10.1103/n1ly-lsck},
  eprint = {2610.13346},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05794742v1},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Interplay of disorder and spin liquid physics in the triangular-lattice antiferromagnet YbZn 2 GaO 5
AU  - Hafsa Zeroual
AU  - Shams Sohel Islam
AU  - Toni Shiroka
AU  - Thomas James Hicken
AU  - Rabindranath Bag
AU  - Sara Haravifard
AU  - Hubertus Luetkens
AU  - Philippe Mendels
AU  - Edwin Kermarrec
AU  - Fabrice Bert
PY  - 2026
DA  - 2026/08/14
JO  - Physical Review B
DO  - 10.1103/n1ly-lsck
UR  - https://hal.science/hal-05794742v1
AB  - YbZn2GaO5 has recently emerged as a structurally ideal triangular-lattice antiferromagnet and a promising candidate for hosting a U(1) Dirac quantum spin-liquid (QSL) ground state. However, signatures of broadened crystal electric field (CEF) excitations have raised questions about potential site disorder and its impact on the intrinsic spin dynamics. In this study, we employ 71Ga nuclear magnetic resonance (NMR) and muon spin relaxation (muSR) to microscopically probe both the structural and magnetic properties of YbZn2GaO5. NMR spectra reveal two inequivalent 71Ga sites and a broad distribution of quadrupolar frequencies, providing clear evidence of Ga^3+/Zn^2+ site mixing and local CEF randomness. The NMR spin-lattice relaxation rate exhibits, down to 1.3~K, a power-law temperature dependence, consistent with persisting spin dynamics below the exchange energy scale in a frustrated magnet. Complementary muSR measurements further show that the spin dynamics persist down to 30mK, with no signs of spin freezing. Together, these results establish that YbZn2GaO5 presents substantial structural disorder, while the persistence of dynamic spin fluctuations down to the lowest temperatures may indicate the survival of QSL-like excitations despite such disorder.
SN  - 2469-9950
SN  - 2469-9969
ER  -