论文标题
有限温度动力和障碍在几乎关键的Ni（Cl $ _ {1-X} $ BR $ _X $）中的作用
Finite-temperature dynamics and the role of disorder in nearly critical Ni(Cl$_{1-x}$Br$_x$)$_2$$\cdot$4SC(NH$_2$)$_2$
论文作者
论文摘要
非弹性中子散射用于研究3维XY XY AntiferRomagnet Ni（Cl $ _ {1-x} $ _ BR $ _X $）$ _ 2 $ _ 2 $ _ 2 $ _ 2 $ _ 2 $ _ 4Sc（nh $ _2 $ _2 $ _ 2 $ _ 2 $ _ 2 $ _ 2 $ _ 2 $ _ 2 $ _ = 0.14（$ x = 0.14（1）$ sotter-soft the the the tun tun-the tun tun tun the the the the the the tun，局部动态结构因子显示$ \hbarΩ/t $缩放行为的特征的量子临界点的特征。测得的临界指数与自旋波理论期望的偏差归因于无序。疾病的另一个作用是高于磁杆带上方的局部激发。它们的能量，结构因子和温度依赖性通过与BR-Ingerity位点相关的简单强键二聚体很好地解释。
Inelastic neutron scattering is used to investigate the temperature dependence of spin correlations in the 3-dimensional XY antiferromagnet Ni(Cl$_{1-x}$Br$_x$)$_2$$\cdot$4SC(NH$_2$)$_2$, $ x = 0.14(1)$, tuned close to the chemical-composition-induced soft-mode transition. The local dynamic structure factor shows $\hbarω/T$ scaling behavior characteristic of a quantum critical point. The deviation of the measured critical exponent from spin wave theoretical expectations are attributed to disorder. Another effect of disorder is local excitations above the magnon band. Their energy, structure factor and temperature dependence are well explained by simple strong-bond dimers associated with Br-impurity sites.
