Investigation on Microscopic Dynamics of Metamagnetic Transition in COCl_2・2H_2O

概要

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The microscopic dynamics of the metamagnetic transition of CoCl_2・2H_2O was investigated by the measurements of the magnetization process at a constant temperature as a function of time, and the field points of temperature spikes (？T) in the course of adiabatic magnetization. The time required for the AF^Fi transition, τ_AF-FI, was measured by the field-step method. τ_AF-FI (T,H)=4.0×10^<-8>. exp (9.0×10^<-3>∣H-H^*∣/T) sec, where H^* was 39 kOe in H_<inc> nd 24 kOe in H_<dec>. The series of delayed AF-Fi transition points predicted by Tinkham were detected by measuring the ？T spikes and magnetization steps at 1.4≤T≤4.2 K. ？T spikes were found at some other points (<H_<C2>) which corresponded to the rearrangement of the mis-fitting spin-sites. From the various anomalies of hysteresis phenomena, which were newly found comparing the results in the field returned back before and after passing H_<C2>, the mechanism of the rearrangement could be discussed.
社団法人日本物理学会の論文
1976-11-15