Spin dynamics of hole doped Y2-xCxBaNiO5.
Spin dynamics of hole doped Y2-xCxBaNiO5.
复制标题
空穴掺杂 Y2-xCxBaNiO5 的自旋动力学。
DOI：
10.1103/physrevlett.76.1731
复制
发表时间：
1995
影响因子：
8.6
通讯作者：
A. Moreo
中科院分区：
文献类型：
--
作者：
E. Dagotto;J. Riera;A. Sandvik;A. Moreo
提出了最近发现的空穴掺杂化合物{\rmY_{2-x} Ca_xBaNi O_5 }$的电子模型。从含氧和镍轨道的多带哈密顿量出发，导出了单带模型。空穴是用类张赖斯的S=1/2态描述的，在S=1自旋链上传播的镍上。使用数值技术来计算的动力学自旋结构因子${\rmS（q，\omega）}$在一个现实的制度的耦合，在Half隙中的光谱重量观察与中子散射数据。模型中出现了S=3/2的低能态。几个预测是为了测试这些想法。
We propose an electronic model for the recently discovered hole doped compound ${\rm Y_{2-x} Ca_x Ba Ni O_5 }$. From a multiband Hamiltonian with oxygen and nickel orbitals, a one band model is derived. Holes are described using Zhang-Rice-like S=1/2 states at the nickels propagating on a S=1 spin chain. Using numerical techniques to calculate the dynamical spin structure factor ${\rm S(q,\omega)}$ in a realistic regime of couplings, spectral weight in the Haldane gap is observed in agreement with neutron scattering data. Low energy states with S=3/2 appear in the model. Several predictions are made to test these ideas.