Fast muon spin relaxation in ferromagnetism of potassium clusters in zeolite A

Abstract

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 ...