中文

动态诱导阻挫作为 Tb2Ti2O7 中量子自旋冰态之路:通过虚晶场激发与量子多体效应

统计力学 2007-05-23 v2 材料科学

摘要

Tb2_2Ti2_2O7_7 烧绿石磁性材料因其{\em 自旋液体}态而备受关注,尽管居里-外斯温度 θCW14\theta_{\rm CW} \sim -14 K,它直到 50 mK 仍未形成长程有序。在本文中,我们通过考虑一个独立四面体的量子模型来重新研究该材料的理论描述,以解释其低温性质。该系统自然调谐地接近 N\'eel 到自旋冰的相边界,使得量子涨落效应得以复兴,导致其有效低能自旋哈密顿量的重要重整化。因此,我们认为 Tb2_2Ti2_2O7_7 是一种{\em 量子自旋冰}。我们提出了利用单晶中子散射对该提议进行实验检验的方案。

关键词

引用

@article{arxiv.cond-mat/0608523,
  title  = {Dynamically-Induced Frustration as a Route to a Quantum Spin Ice State in Tb2Ti2O7 via Virtual Crystal Field Excitations and Quantum Many-Body Effects},
  author = {Hamid R. Molavian and Michel J. P. Gingras and Benjamin Canals},
  journal= {arXiv preprint arXiv:cond-mat/0608523},
  year   = {2007}
}

备注

5 pages, 3 figures. Version 2 has a modified introduction. Figure 2b of version 1 (experimental neutron scattering has been removed. A proposal for an experimental test is now included accompanied by a new Figure (Fig. 3)