Magnetic correlations in the spin ice Ho2-xYxTi2O7 as revealed by neutron polarization analysis
Magnetic correlations in the spin ice Ho2-xYxTi2O7 as revealed by neutron polarization analysis
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DOI：
10.1103/physrevb.82.172403
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发表时间：
2010-11-05
影响因子：
3.7
通讯作者：
Lees, M. R.
中科院分区：
文献类型：
--
作者：
Chang, L. J.;Su, Y.;Lees, M. R.
我们提出了单晶磁漫中子散射测量与极化分析自旋冰Ho 2-xYxTi 2 O 7（x=0，0.3，和1）。在2 K，自旋翻转散射图案是典型的最近邻自旋冰和Y掺杂的影响被认为是在窄点的宽度。在低温下，自旋翻转图案是偶极自旋冰的特征，并且不受Y掺杂的影响。在非自旋翻转通道中，我们观察到强反铁磁相关的签名在相同的温度下，偶极自旋冰相关出现在自旋翻转通道。这些实验观察结果已被我们的Monte Carlo模拟很好地再现。
We present single-crystal magnetic diffuse neutron-scattering measurements with polarization analysis on the spin ice Ho2-xYxTi2O7 (x=0, 0.3, and 1). At 2 K, the spin-flip scattering patterns are typical of a nearest-neighbor spin ice and the effects of Y doping are seen in the widths of the pinch points. At low temperature, the spin-flip patterns are characteristic of a dipolar spin ice and are unaffected by Y doping. In the nonspin-flip channel, we observe the signature of strong antiferromagnetic correlations at the same temperature as the dipolar spin-ice correlations appear in the spin-flip channel. These experimental observations have been well reproduced by our Monte Carlo simulations.