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We found that α-RuCl3 exhibits a magnetic-field-induced quantum spin liquid (QSL) state. This state features a spin gap that grows linearly with magnetic field, confirming theoretical predictions for the Kitaev model.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Magnetism

Background:

  • The honeycomb lattice material α-RuCl3 is a candidate for realizing a Kitaev quantum spin liquid (QSL) ground state.
  • Understanding exotic magnetic phases in frustrated quantum materials is a key challenge in condensed matter physics.

Purpose of the Study:

  • To investigate the magnetic properties of α-RuCl3 under an applied magnetic field.
  • To provide direct evidence for or against the existence of a QSL state in α-RuCl3.

Main Methods:

  • $^{35}$Cl nuclear magnetic resonance (NMR) spectroscopy was employed.
  • Measurements were conducted on α-RuCl3 samples subjected to varying magnetic fields.

Main Results:

  • A magnetic-field-induced QSL state was observed for fields exceeding approximately 10 Tesla.
  • A spin gap opens and increases linearly with magnetic field, reaching ~50 K at 15 T.
  • Sharp resonance lines indicate quantum disorder and local spin fluctuations, inconsistent with conventional magnetic ordering.

Conclusions:

  • The experimental results provide direct evidence for a field-induced QSL in α-RuCl3.
  • The observed spin gap behavior is consistent with theoretical predictions of the Kitaev model.
  • The findings exclude a fully polarized ferromagnetic ground state and highlight the unique nature of this QSL phase.