论文标题
dy $ _2 $ ir $ _2 $ o $ _7 $的磁性行为超出平均字段近似
The magnetic behaviour of Dy$_2$Ir$_2$O$_7$ -- beyond the mean field approximation
论文作者
论文摘要
通过特定的热量和磁化测量结果研究了Pyrochlore iRITAS的磁性dy $ _2 $ _2 $ _2 $ o $ _7 $。低温行为被证实与先前发表的结果一致，而高温数据及其分析首次提出。在128 K时，在零场冷却和场冷却方案下测得的磁化的分叉与异常发作的特定热方向重合，以指向iridium sublattice的订购。此外，我们的高温磁化和特定的热数据在先前确定的crystal场方案的框架中解释了$ _2 $ ir $ _2 $ o $ $ _7 $。计算和实验数据之间以20 k比热异常表示的差异表明，所研究的行为超出平均场近似。这与其余的重稀土pyrochlore触发物形成鲜明对比，在该晶状体中，平均场近似构成了足够的描述。
The magnetic properties of a pyrochlore iridate Dy$_2$Ir$_2$O$_7$ prepared by the CsCl flux method were investigated by means of specific heat and magnetization measurements. The low temperature behaviour was confirmed to be consistent with previously published results, whereas the high temperature data and their analysis are presented for the first time. At 128 K, a bifurcation of magnetization measured under zero field cooled and field cooled regimes coincides with an onset of the anomaly in specific heat pointing to an ordering of the iridium sublattice. Further, our high-temperature magnetization and specific heat data are interpreted in the frame of the previously determined crystal field scheme for Dy$_2$Ir$_2$O$_7$. The difference between calculations and experimental data, represented by 20 K specific heat anomaly, suggests the behaviour of studied iridate beyond the mean field approximation. This is in contrast with the rest of the heavy rare-earth pyrochlore iridates, where the mean field approximation constitutes an adequate description.
