论文标题
$ xy $ pyrochlore antromagnet er $ _2 $ alsbo $ _7 $
Absence of long-range order in an $XY$ pyrochlore antiferromagnet Er$_2$AlSbO$_7$
论文作者
论文摘要
已知稀有地球的pyrochlores表现出异国情调的磁现象。我们报告了一项关于新的稀土化合物ER $ _2 $ alsbo $ _7 $的晶体生长和特征的研究，其中Al $^{3+} $和SB $^{5+} $ ions与随机分布共享相同的位置。通过磁敏感性，比温度低到几十毫米的磁性敏感性，比热和热导率测量进行了研究。不同于其他报告的基于ER的pyrochlores，其表现出不同的磁有序状态，在ER $ _2 $ alsbo $ _7 $低于0.37 K中，检测到自旋冻结过渡，这主要归因于固有的结构障碍。鉴于AC敏感性中峰位置的频率依赖性，提出了簇旋转玻璃状态。另外，导热率的温度和场依赖性表明旋转波动相当强，这可能是由于相位竞争所致。
Rare-earth pyrochlores are known to exhibit exotic magnetic phenomena. We report a study of crystal growth and characterizations of a new rare-earth compound Er$_2$AlSbO$_7$, in which Al$^{3+}$ and Sb$^{5+}$ ions share the same positions with a random distribution. The magnetism are studied by magnetic susceptibility, specific heat and thermal conductivity measurements at low temperatures down to several tens of milli-kelvin. Different from the other reported Er-based pyrochlores exhibiting distinct magnetically ordered states, a spin-freezing transition is detected in Er$_2$AlSbO$_7$ below 0.37 K, which is primarily ascribed to the inherent structural disorder. A cluster spin-glass state is proposed in view of the frequency dependence of the peak position in the ac susceptibility. In addition, the temperature and field dependence of thermal conductivity indicates rather strong spin fluctuations which is probably due to the phase competition.
