Spin correlations in Ho2Ti2O7:: A dipolar spin ice system -: art. no. 047205
Spin correlations in Ho2Ti2O7:: A dipolar spin ice system -: art. no. 047205
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DOI：
10.1103/physrevlett.87.047205
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发表时间：
2001-07-23
影响因子：
8.6
通讯作者：
Fennell, T
中科院分区：
文献类型：
--
作者：
Bramwell, ST;Harris, MJ;Fennell, T
烧绿石材料Ho_2Ti_2O_7被认为具有“自旋冰”行为。我们目前的中子散射和比热的结果，明确地建立Ho2Ti2O7表现出自旋冰在低温下的相关性。最近邻自旋冰模型能很好地描述中子磁散射，偶极自旋冰模型能很好地描述中子磁散射。的热容量是很好地占的偶极自旋冰的贡献和预期的核自旋贡献，已知存在于其他Ho 3+盐的总和。这些结果解决了Ho2Ti2O7中的低温自旋相关性的性质问题，其中相互矛盾的说法已经提出。
The pyrochlore material Ho2Ti2O7 has been suggested to show "spin ice" behavior. We present neutron scattering and specific heat results that establish unambiguously that Ho2Ti2O7 exhibits spin ice correlations at low temperature. Diffuse magnetic neutron scattering is quite well described by a nearest neighbor spin ice model and very accurately described by a dipolar spin ice model. The heat capacity is well accounted for by the sum of a dipolar spin ice contribution and an expected nuclear spin contribution, known to exist in other Ho3+ salts. These results settle the question of the nature of the low temperature spin correlations in Ho2Ti2O7 for which contradictory claims have been made.