An intermediate state between the agome-ice and the fully polarized state in Dy2Ti2O7
An intermediate state between the agome-ice and the fully polarized state in Dy2Ti2O7
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DOI：
10.4279/pip.070009
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发表时间：
2015-01-01
影响因子：
0.9
通讯作者：
Grigera, T. S.
中科院分区：
文献类型：
--
作者：
Grigera, S. A.;Borzi, R. A.;Grigera, T. S.
Dy2Ti2O7是目前最清洁的自旋冰材料。前人关于Kagome-冰与全极化态之间的一阶跃迁的理论和实验工作已被视为对偶极自旋-冰模型的验证。在这里，我们使用交流磁化率和直流磁化来深入研究这种相变，并将这一结果与蒙特卡罗模拟以及先前的磁化和比热测量进行比较。我们发现了介于Kagome-ICE和全极化之间的中间态的信号。目前用于描述自旋-冰材料的理论模型中没有这种特征。
Dy2Ti2O7 is at present the cleanest example of a spin-ice material. Previous theoretical and experimental work on the first-order transition between the kagome-ice and the fully polarized state has been taken as a validation for the dipolar spin-ice model. Here we investigate in further depth this phase transition using ac-susceptibility and dc-magnetization, and compare this results with Monte-Carlo simulations and previous magnetization and specific heat measurements. We find signatures of an intermediate state between the kagome-ice and full polarization. This signatures are absent in current theoretical models used to describe spin-ice materials.