论文标题
基于动力学方程的量子自旋相关的微观理论
Microscopic theory of OMAR based on kinetic equations for quantum spin correlations
论文作者
论文摘要
开发了相关动力学方程方法，可以描述材料中与跳运输的旋转相关性。考虑自旋的量子性质。该方法应用于有机磁阻（OMAR）的双极机理，在大型哈伯德能量和小型施加电场的极限下。对磁舒张很重要的自旋松弛被认为是由于超精细的相互作用与原子核相互作用。结果表明，磁阻的线形取决于短距离传输属性。具有相同超精细相互作用但电子啤酒花统计量不同的不同模型系统导致不同的磁性线形，包括两种经验定律$ h^2/（H^2 + H_0^2）$和$ H^2/（| H | + H_0）^2 $通常用于适合实验结果。
The correlation kinetic equation approach is developed that allows describing spin correlations in a material with hopping transport. The quantum nature of spin is taken into account. The approach is applied to the problem of the bipolaron mechanism of organic magnetoresistance (OMAR) in the limit of large Hubbard energy and small applied electric field. The spin relaxation that is important to magnetoresistance is considered to be due to hyperfine interaction with atomic nuclei. It is shown that the lineshape of magnetoresistance depends on short-range transport properties. Different model systems with identical hyperfine interaction but different statistics of electron hops lead to different lineshapes of magnetoresistance including the two empirical laws $H^2/(H^2 + H_0^2)$ and $H^2/(|H| + H_0)^2$ that are commonly used to fit experimental results.
