Possible spin frustration in Nd2Ti2O7 probed by muon spin relaxation

被引：5
|
作者：
Guo, Hanjie [1 ,2 ]
Xing, Hui [1 ,2 ]
Tong, Jun [1 ,2 ]
Tao, Qian [1 ,2 ]
Watanabe, Isao [3 ]
Xu, Zhu-an [1 ,2 ]
机构：
[1] Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China
[2] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China
[3] RIKEN, Adv Meson Sci Lab, Wako, Saitama 3510198, Japan
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2014年 / 26卷 / 43期
基金：
美国国家科学基金会;
关键词：
cooperative paramagnet; frustration; mu SR; MAGNETIC MONOPOLES; ZERO-FIELD; DYNAMICS;
D O I：
10.1088/0953-8984/26/43/436002
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Muon spin relaxation on Nd2Ti2O7 (NTO) and NdLaTi2O7 (NLTO) compounds are presented. The time spectra for both compounds are as expected for the paramagnetic state at high temperatures, but deviate from the exponential function below around 100 K. Firstly, the muon spin relaxation rate increases with decreasing temperature and then levels off below around 10 K, which is reminiscent of the frustrated systems. An enhancement of the relaxation rate by a longitudinal field in the paramagnetic state is observed for NTO and eliminated by a magnetic dilution for the NLTO sample. This suggests that the spectral density is modified by a magnetic dilution and thus indicates that the spins behave cooperatively rather than individually. The zero-field measurement at 0.3 K indicates that the magnetic ground state for NTO is ferromagnetic.
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收藏
页数：5
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