Electron spin resonance on the spin-1/2 triangular magnet NaYbS₂

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Magnetism

Background:

• The delafossite structure of NaYbS2 hosts a planar spin-1/2 triangular lattice of Ytterbium (Yb3+) ions.
• This arrangement suggests a potential realization of a quantum spin-liquid state, a novel phase of matter.
• Understanding the spin dynamics in such systems is crucial for exploring exotic quantum phenomena.

Purpose of the Study:

• To investigate the spin dynamics of Yb3+ ions in single-crystalline NaYbS2.
• To characterize the electron spin resonance (ESR) properties of NaYbS2.
• To assess its potential as a quantum spin liquid candidate.

Main Methods:

• Electron Spin Resonance (ESR) spectroscopy.
• Measurements performed on single-crystalline samples of NaYbS2.
• Experiments conducted down to a temperature of 2.7 K and at low magnetic fields (<1 T).

Main Results:

• Clear ESR spectra with significant anisotropy were observed.
• The resonance signal in NaYbS2 is accessible at low magnetic fields.
• The narrow resonance line allows for accurate determination of relaxation rates and the g factor of Yb3+ spins.

Conclusions:

• NaYbS2 exhibits unique ESR characteristics distinct from other known quantum spin liquid candidates.
• The observed properties suggest NaYbS2 is a promising material for studying quantum spin liquid physics.
• Further investigation of its spin dynamics can provide deeper insights into exotic magnetic states.