# Electron Spin Resonance on the spin-1/2 triangular magnet NaYbS2

## TL;DR

This study uses Electron Spin Resonance to analyze the spin dynamics of NaYbS2, a potential quantum spin-liquid with a triangular lattice, revealing clear anisotropic spectra and accessible low-field resonance.

## Contribution

It provides the first detailed ESR characterization of NaYbS2, highlighting its unique low-field, narrow resonance properties compared to other spin-liquid candidates.

## Key findings

- Clear ESR spectra with large anisotropy observed down to 2.7 K
- Resonance accessible at low magnetic fields (< 1T)
- Accurate measurement of Yb3+ spin relaxation and g factor

## Abstract

The delafossite structure of NaYbS2 contains a planar spin-1/2 triangular lattice of Yb3+ ions and features a possible realisation of a quantum spin-liquid state. We investigated the Yb3+ spin dynamics by Electron Spin Resonance (ESR) in single-crystalline samples of NaYbS2. Very clear spectra with a well-resolved and large anisotropy could be observed down to the lowest accessible temperature of 2.7 K. In contrast to the ESR properties of other known spin-liquid candidate systems, the resonance seen in NaYbS2 is accessible at low fields (< 1T) and is narrow enough for accurate characterisation of the relaxation rate as well as the g factor of the Yb3+ spins.