μSR study of the “anti-glass” LiHo0.045Y0.955F4

The nature of the “antiglass” state is still not understood, and not much experimental data is available. We studied this system at the microscopic scale using μSR. Zero field and longitudinal field measurements were performed from room temperature down to 20 mK. We found that the Ho spins remain dynamic down to 20 mK with a fluctuation rate equal to 2.6 MHz in a longitudinal field of 16 G.