Spin dynamics in i-R 8Mg 42Zn 50 Quasicrystals (R=Gd, Tb, Dy)

Abstract

Spin dynamics has been investigated in icosahedral R 8Mg 42Zn 50 quasicrystals (R=Gd, Tb, Dy) by means of muon spin relaxation experiments. Two distinct components are clearly observed, one of them being a fast relaxing signal with a stretched exponential form as in some disordered systems. The corresponding depolarization rate strongly increases when the temperature approaches the ordering temperature T N defined by neutron diffraction experiments. Crystal field effects seem to be noticeable, especially in the dysprosium compound.