Chang L J, Lees M R, Balakrishnan G, Kao Y-J, Hillier A D
Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan.
Sci Rep. 2013;3:1881. doi: 10.1038/srep01881.
In the ground state of Ho2Ti2O7 spin ice, the disorder of the magnetic moments follows the same rules as the proton disorder in water ice. Excitations take the form of magnetic monopoles that interact via a magnetic Coulomb interaction. Muon spin rotation has been used to probe the low-temperature magnetic behaviour in single crystal Ho2-xYxTi2O7 (x = 0, 0.1, 1, 1.6 and 2). At very low temperatures, a linear field dependence for the relaxation rate of the muon precession λ(B), that in some previous experiments on Dy2Ti2O7 spin ice has been associated with monopole currents, is observed in samples with x = 0, and 0.1. A signal from the magnetic fields penetrating into the silver sample plate due to the magnetization of the crystals is observed for all the samples containing Ho allowing us to study the unusual magnetic dynamics of Y doped spin ice.
在Ho₂Ti₂O₇自旋冰的基态中，磁矩的无序遵循与水冰中质子无序相同的规则。激发以磁单极子的形式出现，它们通过磁库仑相互作用相互作用。μ子自旋旋转已被用于探测单晶Ho₂₋ₓYₓTi₂O₇（x = 0、0.1、1、1.6和2）的低温磁行为。在非常低的温度下，在x = 0和0.1的样品中观察到μ子进动弛豫率λ(B)的线性场依赖性，这在之前关于Dy₂Ti₂O₇自旋冰的一些实验中与单极子电流有关。对于所有含Ho的样品，都观察到由于晶体磁化而穿透到银样品盘中的磁场信号，这使我们能够研究Y掺杂自旋冰的异常磁动力学。
