Emergent order in the spin-frustrated system DyxTb2-xTi2O7 studied by ac susceptibility measurements

作者：Xing Hui^*; He Mi; Feng Chunmu; Guo Hanjie; Zeng Hao; Xu Zhu An

来源：Physical Review B, 2010, 81(13): 134426.

DOI：10.1103/PhysRevB.81.134426

We report the ac susceptibility study of DyxTb2-xTi2O7 with x is an element of [0,2]. In addition to the single-ion effect at T-s (single-ion effect peak temperature) corresponding to the Dy3+ spins as that in spin ice Dy2Ti2O7 and a possible spin freezing peak at T-f (T-f <3 K), a new peak associated with Tb3+ is observed in chi(ac)(T) at nonzero magnetic field with a characteristic temperature T* (T-f <T*<T-s). T* increases linearly with x in a wide composition range (0<x<1.5 at 5 kOe). Both application of a magnetic field and increasing doping with Dy3+ enhance T*. The T* peak is found to be thermally driven with an unusually large energy barrier as indicated from its frequency dependence. These effects are closely related to the crystal-field levels and the underlying mechanism remains to be understood.

• 出版日期2010-4-1
• 单位浙江大学