Electron spin resonance study on the 4f honeycomb quantum magnet YbCl3.

The local magnetic properties of Yb3+ in the layered honeycomb material YbCl3 were investigated by electron spin resonance on single crystals. For in-plane and out-of-plane field orientations the g-factor shows a clear anisotropy (g‖ = 2.97(8) and g_perp = 1.53(4)), whereas the low temperature exchange coupling and the spin relaxation display a rather isotropic character. At elevated temperatures the contribution of the first excited crystal field level (21 ± 2 meV) dominates the spin relaxation.&#xD.