Anomaly of the Proton Spin-Lattice Relaxation Time of the Dicalcium Strontium Propionate (Ca_2Sr(C_2H_5COO)_6) in the Vicinity of the Ferroelectric Transition Temperature

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Proton spin-lattice relaxation time (T_1) in a single crystal of Ca_2Sr(C_2H_5COO)_6(DSP) has been measured over the temperature range -30℃∼60℃ applying the static magnetic field along the c axis. The temperature was precisely controlled within ±0.05℃ using a circulation system of a heat transfer liquid. Special attention was paid upon the anomalous behavior of T_<1^<-1>> near the ferroelectric transition temperature. The anomalous part of T_<1^<-1>>((T_<1^<-1>>)_<fluc>) which is caused by the critical fluctuations in the electric dipole system shows the logarithmic divergence (corresponding to the critical index of zero) except very close to the transition temperature both in the paraelectric phase and in the ferroelectric phase. The peak of (T_<1^<-1>>) rounds off for about ∣T-T_c∣/T_c=0.25×10^<-2> in the ferroelectric phase, and for about (T-T_c)/T_c=0.8×10^<-2> in the paraelectric phase.
社団法人日本物理学会の論文
1973-05-05