Aging dynamics of ferromagnetic and reentrant spin glass phases in stage-2 Cu₀.₈₀C₀.₂₀Cl₂ graphite intercalation compound
Suzuki, Masatsugu · Suzuki, Itsuko S.
Original · EN
Aging dynamics of a reentrant ferromagnet stage-2 Cu₀.₈Co₀.₂Cl₂ graphite intercalation compound has been studied using DC magnetic susceptibility. This compound undergoes successive transitions at the transition temperatures Tc (≈ 8.7 K) and TRSG (≈ 3.3 K). The relaxation rate SZFC(t) exhibits a characteristic peak at tcr below Tc. The peak time tcr as a function of temperature T shows a local maximum around 5.5 K, reflecting a frustrated nature of the ferromagnetic phase. It drastically increases with decreasing temperature below TRSG. The spin configuration imprinted at the stop and wait process at a stop temperature Tₛ (<Tc) during the field-cooled aging protocol, becomes frozen on further cooling. On reheating, the memory of the aging at Tₛ is retrieved as an anomaly of the thermoremnant magnetization at Tₛ. These results indicate the occurrence of the aging phenomena in the ferromagnetic phase (TRSG<T<Tc) as well as in the reentrant spin glass phase (T<TRSG).
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