Frontiers in Physics (Jun 2024)

Nuclear magnetic resonance studies in a model transverse field Ising system

  • Y.-H. Nian,
  • I. Vinograd,
  • C. Chaffey,
  • Y. Li,
  • M. P. Zic,
  • M. P. Zic,
  • P. Massat,
  • R. R. P. Singh,
  • I. R. Fisher,
  • N. J. Curro

DOI
https://doi.org/10.3389/fphy.2024.1393229
Journal volume & issue
Vol. 12

Abstract

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The suppression of ferroquadrupolar order in TmVO4 in a magnetic field is well-described by the transverse field Ising model, enabling detailed studies of critical dynamics near the quantum phase transition. We describe nuclear magnetic resonance measurements in pure and Y-doped single crystals. The non-Kramers nature of the ground state doublet leads to a unique form of the hyperfine coupling that exclusively probes the transverse field susceptibility. Our results show that this quantity diverges at the critical field, in contrast to the mean-field prediction. Furthermore, we find evidence for quantum critical fluctuations present near Tm-rich regions in Y-doped crystals at levels beyond which long-range order is suppressed, suggesting the presence of quantum Griffiths phases.

Keywords