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arXiv 1003.5961cond-mat.mtrl-scicond-mat.str-el
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交流磁化率测量研究自旋阻挫系统DyxTb2-xTi2O7中的涌现序

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

Hui Xing, Mi He, Chunmu Feng, Hanjie Guo, Hao Zeng, Zhu-An Xu

摘要:

我们报告了交流。Dy_ xTb_{2-x} Ti_2O_7与x在[0,2]中磁化率研究在非零磁场作用下,$χ_{ac}(T)$中除了观察到与Dy ~(3+)自旋相对应的单离子效应峰温度Ts(single-ion effect peak temperature)和可能的自旋冻结峰Tf(Tf < 3 K)外,还观察到一个与Tb ~(3+)相关的新峰,其特征温度为T^*(Tf < T^* < Ts)。在很宽的组成范围内(0 < x < 1.5,5 kOe),T^* 随x线性增加。施加磁场和增加Dy 3+的掺杂都提高了T^*。发现T^* 峰是热驱动的,具有异常大的能垒,如其频率依赖性所示。这些效应与晶体场能级密切相关,其机制尚待进一步研究。

英文摘要:

We report the a.c. susceptibility study of Dy_xTb_{2-x}Ti_2O_7 with x in [0, 2]. In addition to the single-ion effect at Ts (single-ion effect peak temperature) corresponding to the Dy3+ spins as that in spin ice Dy_2Ti_2O_7 and a possible spin freezing peak at Tf (Tf < 3 K), a new peak associated with Tb^{3+} is observed in $χ_{ac}(T)$ at nonzero magnetic field with a characteristic temperature T^* (Tf < T^* < Ts). 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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