Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low
temperatures. A remarkable decrease in the initial asymmetry was observed previously
below the Curie temperature in zero-field μSR by using pulsed muons. In the present work
by using dc muons, we clearly observed the fast decay component which was assigned to
the decrease in the initial asymmetry in the previous pulsed muon experiment. The
relaxation rate amounts to≃ 20μs-1 which corresponds to≃ 200Oe in the random static ...