A quantum spin liquid (QSL) shows no magnetic order down to zero temperature but the spins are highly entangled. More and more interests are attracted to 2D spin-1/2 triangular-lattice QSL systems with strong spin-orbital coupling including YbMgGaO4, in which our neutron scattering measurements have revealed dispersive spinon excitations with a clear upper excitation edge. Here, we propose to carry out µSR measurements on its isostructural compound TmMgGaO4 single crystals, which shows stronger exchange coupling and non-Kramers doublet ground state, resulting in a different magnetic picture. We will try to figure out its ground state at low temperature and try to evaluate the spin-spin correlation time from the field dependence of λ. Such measurement will help further understanding the QSL ground state, and the results will be compared with that of YbMgGaO4.
