Magnetic order and dynamical properties of the spin-frustrated magnet Dy_{2鈭?span style='font-style: italic'>x}Yb_xTi₂O₇

详细信息    查看全文

• 作者：Hui Liu ; Youming Zou ; Lei Zhang ; Langsheng Ling ; Hongyan Yu ; Lei He ; Changjin Zhang ; Yuheng Zhang
• 关键词：Pyrochlore ; Hybrid frustrated magnet ; Spin interaction ; Crystalline electric field
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：January, 2014
• 年：2014
• 卷：349
• 期：Complete
• 页码：173-179
• 全文大小：2340 K

文摘

The magnetic order and dynamical properties of spin-frustrated magnet Dy_2鈭?em>xYb_xTi₂O₇ single crystals have been studied by dc and ac susceptibility measurements. It is found that the substitution of the Dy³⁺ by the Yb³⁺ in Dy₂Ti₂O₇ relaxes ferromagnetic coupling. In low Yb³⁺ doping samples, a spin freezing peak at T_f (T_f<3 K) and a single-ion effect peak T_s associated with Dy³⁺ are observed. With increasing Yb³⁺ doping, a new peak marked by T^{鈦?/sup> associated with Yb3+ appears. We suggest that T鈦?/sup> originates from the thermally activated spin fluctuations of Yb3+. It is also found that the relaxation process for T_s becomes both thermally activated and quantum tunneled in x鈮?.0 samples. The low-temperature dynamical behaviors of Dy_2鈭?em>xYb_xTi₂O₇ are dominated by the Dy-Yb spin interactions and the altered crystalline electric field. Moreover, crystal field-phonon coupling may contribute to the spin dynamic properties.}