Long-range order at low temperatures in dipolar spin ice
Long-range order at low temperatures in dipolar spin ice
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DOI：
10.1103/physrevlett.87.067203
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发表时间：
2001-08-06
影响因子：
8.6
通讯作者：
Gingras, MJP
中科院分区：
文献类型：
--
作者：
Melko, RG;den Hertog, BC;Gingras, MJP
最近有人提出，长程磁偶极相互作用是负责自旋冰的行为在伊辛烧绿石磁体Dy2Ti2O7和Ho2Ti2O7。我们在这里报告的偶极自旋冰模型的低温性能的数值结果，通过一个新的循环算法，大大提高了在低温下的动力学。我们恢复了以前报道的丢失熵在这个模型中，并找到一个一阶过渡到一个长程有序相零总磁化在非常低的温度。我们讨论了这些结果的相关性Dy2Ti2O7和Ho2Ti2O7。
It has recently been suggested that long-range magnetic dipolar interactions are responsible for spin ice behavior in the Ising pyrochlore magnets Dy2Ti2O7 and Ho2Ti2O7. We report here numerical results on the low temperature properties of the dipolar spin ice model, obtained via a new loop algorithm which greatly improves the dynamics at low temperature. We recover the previously reported missing entropy in this model, and find a first order transition to a long-range ordered phase with zero total magnetization at very low temperature. We discuss the relevance of these results to Dy2Ti2O7 and Ho2Ti2O7.