Speaker
Description
Quantum spin liquids (QSL) exhibit large sensitivity to perturbations,such as the Dzyaloshinskii-Moriya (DM) interaction.Using the combination of Electron Spin Resonance (ESR) and Muon Spin Rotation ($\mu$SR),we studied the DM interaction in QSL candidates.In the triangular-lattice QSL,$\kappa$-(BEDT-TTF)$_2$Ag$_2$(CN)$_3$,our ESR measurements found a staggered moment of $\mu_{\text{s}}$=6$\times$10$^{-3}\mu_{\text{B}}$.The magnetic field dependence of the ESR-linewidth proves $\mu_{\text{s}}$ to stem from the DM interaction.In a new quasi-one-dimensional QSL,(EDT-TTF-CONH$_2$)$_2^+$BABCO$^-$,our ESR and $\mu$SR study confirmed absence of magnetic ordering down to 20mK,partially due to the highly disordered BABCO$^-$ molecular rotor layer.The ESR-linewidth and longitudinal-field $\mu$SR measurements reveal one-dimensional diffusive spin excitations.Despite the sizable DM interaction,the staggered moment remains negligible,owing to the strong disorder introduced by the anion layer.
