Physics Department, Indiana University, Bloomington, IN 47408, USA.
J Phys Condens Matter. 2011 Apr 27;23(16):164220. doi: 10.1088/0953-8984/23/16/164220. Epub 2011 Apr 6.
The static and dynamic spin correlations in the spin ices Dy(2.3)Ti(1.7)O(6.85) and Dy(2)Ti(2)O(7) have been studied in polarized neutron diffraction and neutron spin echo experiments. The measurements reveal that, below 100 mK, the magnetic scattering broadens and shifts to higher |Q| upon stuffing the pyrochlore lattice with additional Dy(3+) ions. These observations can be related, by means of reverse Monte Carlo simulation, to the modified distribution of near-neighbour distances and an overall more antiferromagnetic character of the near-neighbour couplings. The dynamic measurements show that the spin correlations are slower in the stuffed system. These results will be discussed and compared to the holmium analogues.
在极化中子衍射和中子自旋回波实验中研究了自旋冰 Dy(2.3)Ti(1.7)O(6.85) 和 Dy(2)Ti(2)O(7) 的静态和动态自旋关联。测量结果表明，在 100 mK 以下，当在钙钛矿晶格中填充额外的 Dy(3+)离子时，磁散射会变宽，并向更高的 |Q| 移动。通过反蒙特卡罗模拟，可以将这些观察结果与近邻距离的修正分布以及近邻耦合的整体更反铁磁性质联系起来。动态测量表明，填充系统中的自旋关联更慢。这些结果将与钬类似物进行讨论和比较。
