Probing the magnetic ground state of the molecular dysprosium triangle with muon spin relaxation

We present zero field muon spin lattice relaxation measurements of a Dysprosium triangle molecular magnet. The local magnetic fields sensed by the implanted muons indicate the coexistence of static and dynamic internal magnetic fields below T^~35 K. Bulk magnetization and heat capacity measurements show no indication of magnetic ordering below this temperature. We attribute the static fields to the slow relaxation of the magnetization in the ground state of Dy₃. The fluctuation time of the dynamic part of the field is estimated to be ~0.55 μs at low temperatures.