Spin ordering and partial ordering in holmium titanate and related systems
Spin ordering and partial ordering in holmium titanate and related systems
复制标题
钛酸钬及相关系统中的自旋排序和部分排序
DOI：
10.1103/physrevb.63.184412
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发表时间：
2000
影响因子：
3.7
通讯作者：
A. P. Ramirez
中科院分区：
文献类型：
--
作者：
R. Siddharthan;B. Shastry;A. P. Ramirez
我们再看一下两种化合物，它们被讨论为可能实现“自旋冰”，即钛酸钬和钛酸镝。正如我们之前观察到的，钛酸钬在低温下不会表现出类似冰的行为，因为自旋之间的长程偶极相互作用与最近邻相互作用相比很强。我们表明，确切地说，这个系统的真实周围状态必须是完全有序的，但模拟只能达到部分有序的状态，因为有无限的能量障碍，这些从真正的基态。我们还表明，我们的模型的真正的基态的镝钛酸盐也是完全有序的，并提供一些解释，为什么模拟和实验显示类冰行为。我们讨论了这些系统的应用磁场的效果。最后，我们讨论了其他几个模型，表现出类似的部分或完全有序的基态，包括著名的伊辛模型的费格。
We take another look at two compounds which have been discussed as possible realizations of ``spin ice,'' namely holmium titanate and dysprosium titanate. As we have earlier observed, holmium titanate does not display icelike behavior at low temperatures because the long-ranged dipolar interactions between spins are strong compared to the nearest-neighbor interactions. We show, exactly, that the true around state of this system must be fully ordered, but simulations only reach partially ordered states because there are infinite energy barriers separating these from the true ground state. We also show that the true ground state of our model of dysprosium titanate is also fully ordered, and offer some explanations as to why simulations and experiments show icelike behavior. We discuss the effect on these systems of an applied magnetic field. Finally, we discuss several other models which show similar partial or full ordering in their ground states, including the well-known Ising model on the fee lattice.