Molavian Hamid R, Gingras Michel J P, Canals Benjamin
Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
Phys Rev Lett. 2007 Apr 13;98(15):157204. doi: 10.1103/PhysRevLett.98.157204. Epub 2007 Apr 12.
The Tb2Ti2O7 pyrochlore magnetic material is attracting much attention for its spin liquid state, failing to develop long-range order down to 50 mK despite a Curie-Weiss temperature thetaCW approximately -14 K. In this Letter we reinvestigate the theoretical description of this material by considering a quantum model of independent tetrahedra to describe its low-temperature properties. The naturally tuned proximity of this system near a Néel to spin ice phase boundary allows for a resurgence of quantum fluctuation effects that lead to an important renormalization of its effective low-energy spin Hamiltonian. As a result, Tb2Ti2O7 is argued to be a quantum spin ice. We put forward an experimental test of this proposal using neutron scattering on a single crystal.
Tb2Ti2O7 烧绿石磁性材料因其自旋液体状态而备受关注，尽管居里 - 外斯温度θCW约为 -14 K，但在低至50 mK时仍未形成长程序。在本信函中，我们通过考虑独立四面体的量子模型来重新研究该材料的理论描述，以描述其低温特性。该系统在奈尔相到自旋冰相边界附近自然调谐的接近度使得量子涨落效应重新出现，这导致其有效低能自旋哈密顿量发生重要的重整化。因此，Tb2Ti2O7被认为是一种量子自旋冰。我们提出了一项使用单晶中子散射对该提议进行实验测试的方案。
