Institut Néel-CNRS/UJF, F-38042 Grenoble, Cedex 9, France.
Phys Rev Lett. 2010 Aug 27;105(9):097202. doi: 10.1103/PhysRevLett.105.097202. Epub 2010 Aug 23.
We report the direct observation by inelastic neutron scattering experiments of a spin triplet of magnetic excitations in the response associated with the ladders in the composite cuprate Sr14Cu24O41. This appears as a peak at q(Q1D)=π and energy Δ1=32.5 meV, and we conjecture that all the triplets making up this conspicuous peak have the same phase and therefore interpret it as the signature of the occurrence of quantum coherence along the ladder direction between entangled spin pairs. From the comparison with previous neutron and x-ray data, we conclude that the temperature evolution of this mode is driven by the crystallization of holes into a charge density wave in the ladder sublattice.
我们通过非弹性中子散射实验直接观察到了复合材料 Sr14Cu24O41 中梯状结构相关响应中的磁激发三重态。该响应表现为在 q(Q1D)=π 处的一个峰，能量为Δ1=32.5 meV。我们推测，构成这个显著峰的所有三重态都具有相同的相位，因此可以将其解释为在梯状结构方向上纠缠的自旋对之间发生量子相干的特征。通过与先前的中子和 X 射线数据的比较，我们得出结论，该模式的温度演化是由梯状亚晶格中的空穴结晶成电荷密度波驱动的。
