Bert F, Mendels P, Olariu A, Blanchard N, Collin G, Amato A, Baines C, Hillier A D
Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud, 91405 Orsay, France.
Phys Rev Lett. 2006 Sep 15;97(11):117203. doi: 10.1103/PhysRevLett.97.117203.
mSR experiments have been performed on a powder sample of the "ordered spin ice" Tb(2)Sn(2)O(7) pyrochlore. At base temperature (T=35 mK), the muon relaxation is found to be of dynamical nature, which demonstrates that strong fluctuations persist below the ferromagnetic transition (T(C)=0.87 K). Hints of long-range ordering appear as oscillations of the muon polarization when an external field is applied and also as a hysteretic behavior below T(C). We propose that dynamics results from fluctuations of clusters of correlated spins with the ordered spin ice structure.
已对“有序自旋冰”Tb₂Sn₂O₇ 烧绿石的粉末样品进行了μ子自旋弛豫（mSR）实验。在基温（T = 35 mK）下，发现μ子弛豫具有动力学性质，这表明在铁磁转变（Tₙ = 0.87 K）以下存在强烈的涨落。当施加外场时，长程序的迹象表现为μ子极化的振荡，并且在Tₙ以下也表现为滞后行为。我们提出，动力学源于具有有序自旋冰结构的相关自旋簇的涨落。
